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Ku-Band Satellite Transceiver

Revision 9

Redundant Equipment Mounting

MN/KST2000AB.IOM

D–11

D.4

1:1 LNA Installation

D.4.1

Feed Mount Offset Antenna

D.4.1.1

1:1 LNA Installation Instructions

1.

Remove the protective cover(s) from the antenna OMT and LNA assembly filter
(if installed).

Note:

After removing the covers, ensure that no foreign material or moisture

enters the antenna OMT of the LNA filter.

2.

Install the appropriate gasket on the antenna OMT.

a) If only one of the mounting surfaces has a groove, use the thin gasket.
b) If both mounting surfaces have grooves, use the thick gasket.

3.

Position the LNA assembly in place on the antenna OMT (with gasket), and
fasten with the provided #6 hardware (4 each screws, splits and nuts, 8 each
flats).

D.5 Cable

Installation

Care should be exercised in cable installation. Install the cables using the most direct
route and secure with clamps and ties. Avoid all sharp bends.

Cable connectors used in outdoor applications must be sealed to avoid leakage,
particularly N-type connectors. Moisture can seep into junctions at the plug end of the
connector, between the fixed and movable parts, and where the cable connects to the
connector. Signal attenuation and possible loss of signal can occur in the presence of
moisture. All cable junctions must be sealed with a self-amalgamating tape, such as 3M,
Type 23 Scotch Self-Amalgamating tape, or equivalent, including military style (MS)
connectors.

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Содержание KST-2000A

Страница 1: ...u Band Satellite Transceiver Installation and Operation Manual IMPORTANT NOTE The information contained in this document supercedes all previously published information regarding this product Product specifications are subject to change without prior notice Part Number MN KST2000AB IOM Revision 9 ...

Страница 2: ......

Страница 3: ...peration Manual Part Number Revision 9 June 25 2007 Copyright Comtech EF Data 2007 All rights reserved Printed in the USA Comtech EF Data 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 Comtech EF Data is an ISO 9001 Registered Company ...

Страница 4: ...t representative with the model number serial number and a description of the problem Request a Return Material Authorization RMA number from the Comtech EF Data Customer Support representative Pack the product in its original shipping carton packaging to ensure that the product is not damaged during shipping Ship the product back to Comtech EF Data Shipping charges should be prepaid For Online Cu...

Страница 5: ...1 1 4 Features 1 4 1 1 5 Single Thread KST 2000A System 1 6 1 1 6 Single Thread KST 2000B System 1 8 1 1 7 Redundant System 1 9 1 2 Specifications 1 10 CHAPTER 2 INSTALLATION 2 1 2 1 Single Thread System Components 2 1 2 2 Redundant System Components 2 2 2 3 Description of Options 2 3 2 4 Electrical Connections 2 4 2 4 1 Converter Unit 2 4 2 4 2 Data SSPAs 2 13 2 4 3 LNA Connections 2 20 2 4 4 LNB...

Страница 6: ...6 1 1 Redundant KST 2000A B System Operation 3 16 3 7 Reference Oscillator 3 22 3 8 Monitor and Control M C 3 23 3 8 1 Up Converter Description 3 25 3 9 Ku to L Band Down Converter Description KST 2000A 3 26 3 10 L Band to IF Down Converter Description KST 2000A B 3 27 3 11 Automatic Gain Control AGC 3 28 3 11 1 Operation 3 29 3 11 2 Fault and Error Response 3 30 3 11 3 Manual Gain Operation 3 31 ...

Страница 7: ...Outline A 7 A 7 Ku Band LNB Equipment Outline A 8 APPENDIX B TERMINAL MODE COMMANDS B 1 B 1 General B 1 B 2 Message Structure B 2 B 2 1 Start Character B 2 B 2 2 Device Address B 2 B 2 3 Command Response B 3 B 2 3 End Character B 4 B 3 System Configuration Commands B 4 B 3 1 Configuration Commands Responses B 5 B 3 2 System Configuration Commands B 6 B 3 3 Reset Commands B 8 B 3 4 Status Commands ...

Страница 8: ... Tools Required D 2 D 2 1 1 Converters Installation D 3 D 2 1 Spar Arm Mount D 3 D 2 2 Pole Mount D 6 D 3 1 1 SSPA Installation D 10 D 3 1 Feed Mount Offset Antenna D 10 D 4 1 1 LNA Installation D 11 D 4 1 Feed Mount Offset Antenna D 11 D 5 Cable Installation D 11 APPENDIX E FSK REMOTE CONTROL COMMANDS E 1 E 1 Introduction E 1 E 2 Basic Protocol E 2 E 2 1 Packet Structure E 3 E 2 2 Start Of Packet...

Страница 9: ... 8 FIGURE 3 4 RJU 2000 BLOCK DIAGRAM 3 9 FIGURE 3 5 REDUNDANT KST 2000A B SYSTEM SHOWING UNITS A AND B DESIGNATION 3 17 FIGURE 3 6 REDUNDANT HPA ASSEMBLY 3 18 FIGURE 3 7 REDUNDANT LNA B ASSEMBLY 3 19 FIGURE 3 8 REFERENCE OSCILLATOR 3 22 FIGURE 3 9 MONITOR AND CONTROL M C BLOCK DIAGRAM 3 23 FIGURE 3 10 IF TO S BAND CONVERTER MODULE BLOCK DIAGRAM 3 25 FIGURE 3 11 S TO KU BAND UP CONVERTER MODULE 3 2...

Страница 10: ... FEATURES 1 5 TABLE 1 2 CONVERTER UNIT SPECIFICATIONS 1 10 TABLE 1 3 SYSTEM TRANSMIT CHARACTERISTICS WITH SSPAS OF 40W 1 11 TABLE 1 4 LNA CHARACTERISTICS 1 12 TABLE 1 5 LNB CHARACTERISTICS 1 12 TABLE 1 6 SSPA CHARACTERISTICS 1 13 TABLE 2 1 DESCRIPTION OF OPTIONS 2 3 TABLE 2 2 CONVERTER UNIT EXTERNAL CONNECTIONS 2 5 TABLE 2 3 REMOTE M C CONNECTOR J2 PIN ASSIGNMENTS 2 6 TABLE 2 4 HPA CONNECTOR J8 PI...

Страница 11: ... mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged Warnings and Cautions WARNING indicates a potentially hazardous situation that if not avoided could result in death or serious injury CAUTION CAUTION indicates a hazardous situation that if not avoided may result in minor or moderate injury CAUTION may also be used to indi...

Страница 12: ...ession if the unit will be installed in a location with questionable power grid quality Comtech EF Data recommends installation of additional power conditioning surge suppression at the power junction box Grounding The transceiver provides a grounding terminal This is provided to allow the user to ground the transceiver to the antenna s grounding network All components installed at the antenna sha...

Страница 13: ...red repaired or misused in any way that in the opinion of Comtech EF Data Corporation would affect the reliability or detracts from the performance of any part of the product or is damaged as the result of use in a way or with equipment that had not been previously approved by Comtech EF Data Corporation The warranty does not apply to any product or parts thereof where the serial number or the ser...

Страница 14: ... Corporation s products the aforementioned warranty and shall indemnify and hold harmless Comtech EF Data Corporation from any claims or liability of such purchaser lessee or user based upon allegations that the buyer its agents or employees have made additional warranties or representations as to product preference or use The remedies provided herein are the buyer s sole and exclusive remedies Co...

Страница 15: ...or the KST 2000A B satellite terminal system The converter unit and 8 Watt SSPA are shown in Figure 1 1 Figure 1 1 KST 2000A B Converter Unit and 8 Watt SSPA Various configurations of the KST 2000A B Ku Band satellite terminal system are available with both optional and standard equipment ...

Страница 16: ...As Note For TX only application downlink functions and hardware are not supplied or available 1 1 1 Receive Reject Filter The KST 2000A B is capable of operating over an uplink frequency of 13 75 to 14 5 GHz Due to the proximity of the lower end of this band to the upper end of the Ku receive band it is possible for the upconverter to radiate noise power in the upper range of the receive band If t...

Страница 17: ...ation The areas of operation are as follows Converter Convection cooled up down converter with an internal power supply and microprocessor based Monitor and Control M C The converter contains a wide band block Ku to L Band down converter in the KST 2000A or this function may be performed in an external Low Noise Block converter LNB in the KST 2000B HPA Offered with various power output capabilitie...

Страница 18: ...z Transmit range in 1 MHz 14 00 to 14 5 GHz Transmit range in 1 MHz Optional 10 95 to 12 75 GHz Receive range in 1 MHz steps KST 2000B Only 13 75 to 14 5 GHz Transmit range in 1 MHz steps for HPAs of 40W 14 00 to 14 5 GHz Transmit range in 1 MHz steps for HPAs of 40W Optional 10 95 to 11 70 GHz 11 70 to 12 20 GHz 12 25 to 12 75 GHz LNB Select Receive range in 1 MHz steps ...

Страница 19: ...e KST 2000A B s internal reference may be locked to an external standard at 5 or 10 MHz in order to reduce the system frequency errors to that set by the external reference or the high stability electrically and mechanically tunable internal reference may be used External LED Indicators for Power On and Fault Indication A GREEN LED indicates prime power ON when blinking and TX RF power ON when ste...

Страница 20: ...he KST 2000A B and to query the system for faults Connection to a remote terminal is not required for the keypad display to function as the keypad display is totally independent of the remote control system In the transmit Uplink direction the converter unit receives a 70 MHz 20 MHz signal 140 MHz 40 MHz signal optional at 25 to 45 dBm from a modem via a 50 or 75Ω coaxial cable The converter s inp...

Страница 21: ...nna is offset in frequency from the transmitted signal allowing rejection of the transmitted signal by the Transmit Reject Filter TRF The exact receive frequency is set by the user via the remote M C or entered using the keypad on keypad display equipped transceivers The received signal is amplified in an LNA whose output is coupled to the converter s input via a coaxial cable with type N connecto...

Страница 22: ...stem a LNB replaces the LNA and the block down converter from Ku Band to L Band in the converter unit In this configuration the LNB sets the received frequency range The LNB to converter cable carries the LNB s L Band output LNB prime power 15 VDC and a 10 MHz reference signal from the converter to the LNB Indoor Units Reference Only Modem Remote M C OMT TRF HPA Converter Unit TX RX TX M C Power K...

Страница 23: ...tem is identical to the single thread except that two independent TX and RX channels are provided Initial selection of TX and RX channels is via the remote M C or keypad During operation and when a fault is detected in one channel an automatic switchover to the other channel occurs The RJU 2000 provides IF I O selection and converter interface connections C0NVERTER UNIT TX IF REMOTE RX IF TX RF RX...

Страница 24: ...ESS 308 309 requirements Converter Receive Characteristics Input Frequency KST 2000A 10 95 to 12 75 GHz KST 2000B 950 to 1700 MHz Output Frequency 50 to 90 MHz 100 to 180 MHz optional Gain 45 dB maximum User Attenuation Range 0 to 20 dB in 1 dB steps Gain Variation with Frequency at a fixed temperature Any 40 MHz band Entire operating band 2 0 dB peak to peak 3 0 dB peak to peak Power Output at 1 ...

Страница 25: ...rnal LED Indicators Prime Power On TX RF ON Summary Fault IF Input Output Connectors Type N Female 50Ω TX Output RX Input Connectors Type N Female 50Ω Size 21 75 H x 8 25W x 8 00D inches 55 2H x 20 95W x 20 32D cm Weight 33 lbs 16 kg Temperature 40 to 55 0 C 40 to 131 0 F operational 50 to 750 C 67 to 167 0 F survival Table 1 3 System Transmit Characteristics with SSPAs of 40W Parameter Characteri...

Страница 26: ... dBm 18 dBm or 30 dBm optional Group Delay Linear Parabolic Ripple 0 01 ns MHz 0 001 ns MHz2 0 1 ns peak to peak Power Connector Powered by the KSAT through the coax RF Input W G WR 75 Cover Input Power Nominal 12 to 24 VDC at 100 mA Table 1 5 LNB Characteristics LNB Characteristics Frequency 10 95 to 11 70 GHz 11 70 to 12 20 GHz 12 25 to 12 75 GHz Gain 25 C 55 dB minimum 60 dB typical 1 dB Gain C...

Страница 27: ...4 dB Gain Variation with Temperature 2 0 dB p p 2 0 dB p p 2 0 dB p p 2 0 dB p p 2 0 dB p p 2 0 dB p p 2 0 dB p p Input Connector Type N Female 50Ω Type N Female 50Ω Type N Female 50Ω Type N Female 50Ω Type N Female 50Ω Type N Female 50Ω Type N Female 50Ω Output Connector WR 75 W G flange WR 75 W G flange WR 75 W G flange WR 75 W G flange WR 75 W G flange WR 75 W G flange WR 75 W G flange Input Po...

Страница 28: ...Ku Band Satellite Transceiver Revision 9 Introduction MN KST2000AB IOM 1 14 NOTES ...

Страница 29: ...gle Thread System Components The standard components delivered with a single thread system include QTY Description 1 Base converter unit 1 HPA no HPA necessary for the 15dBm requirement 1 LNA KST 2000A system or LNB KST 2000B system As Required 12ft 3 66m Prime power cables for all converter units and applicable amplifiers As Required 5ft 1 52m Interlink cabling As Required Mounting hardware for a...

Страница 30: ...s 1 RJU 2000 switch junction box As Required Interlink cabling from the base converters to the RJU 2000 switch junction box 1 15ft 4 57m Interlink cable for the RX 1 1 waveguide LNA assembly mounted directly to the OMT 1 10ft 3 05m Interlink cable for the TX 1 1 waveguide HPA assembly TX switching for 15dBm 1 1 system is provided via coaxial switch 1 3ft 1m Flexible waveguide connects the output o...

Страница 31: ...00B only 11 70 to 12 20 GHz North American KST2000B only 12 25 to 12 75 GHz Aussat MOUNTING HARDWARE OPTIONS Standard Prodelin spar offset antenna base converter units are pole mounted for redundant systems Standard Channel Master spar offset antenna base converter units are pole mounted for redundant systems Non standard single thread converter pole mount Kit No mounting hardware beyond the pick ...

Страница 32: ...he external connections on the converter unit are shown in Figure 2 1 and listed in Table 2 2 The connections are described in the following paragraphs J8 HPA J7 RF IN J6 RF OUT J9 REF IN J10 1 1 F2 F1 FAULT TX ON J2 REMOTE J3 IF IN J4 IF OUT J1 PRIME POWER J5 RX MON GND ERDE Figure 2 1 I O View of KST 2000A B Converter Unit ...

Страница 33: ...12 75 GHz RX in from LNA KST 2000B 950 to 1700 MHz from LNB J8 HPA 10 pin circular Female HPA M C Interface J9 REF IN Type N Female External system reference input 5 or 10 MHz at 6 dBm min J10 1 1 32 pin circular Female Redundancy Control 2 4 1 1 AC Prime Power Connector J1 Prime power is supplied to the converter unit and for SSPAs of 8 Watts through a 3 pin circular male connector J1 as in Figur...

Страница 34: ... Refer to Table 2 3 for pin assignments Note The user must assemble this cable Figure 2 3 shows the connections for an EIA 232 adapter for use with a PC COM port Table 2 3 Remote M C Connector J2 Pin Assignments Pin Signal Description A TX RX or RX only see Note EIA 485 TX RX or EIA 422 RX B TX RX or TX only see Note EIA 485 TX RX or EIA 422 TX C TX RX or RX only see Note EIA 485 TX RX or EIA 422 ...

Страница 35: ... fault relay common W UL_FLT_NO Uplink fault relay open fault X DL_FLT_NC Downlink fault relay closed fault Y DL_FLT_COM Downlink fault relay common Z DL_FLT_NO Downlink fault relay open fault a SUM_FLT_NO Summary fault relay open fault b SUM_FLT_NC Summary fault relay closed fault c SUM_FLT_COM Summary fault relay common Notes 1 These signals can be configured as EIA 485 2 wire half duplex or EIA...

Страница 36: ...emale connector used to connect the IF at 70 MHz 140 MHz optional at 25 to 45 dBm from the modem to the converter unit Either 50Ω or 75Ω cables may be used to connect to J3 2 4 1 5 IF OUT Connector J4 The IF OUT connector J4 is a Type N female connector used to connect the IF at 70 MHz 140 MHz optional from the converter unit to the modem Either 50Ω or 75Ω cables may be used to connect to J4 ...

Страница 37: ...0 to 12 249 12 25 to 12 75 Subtract the DRO Frequency GHz 10 0 10 75 11 3 RX MON at L Band MHz 950 to 1699 950 to 1499 950 to 1450 2 4 1 7 RF OUT Connector J6 The RF OUT connector J6 is a type N female 50Ω connector used to connect the converter unit s output at Ku Band uplink to an HPA Power output at 1 dB compression is 15 dBm minimum 2 4 1 8 RF IN Connector J7 The RF IN connector J7 is a type N...

Страница 38: ... 40W J 10V_RTN 10V Power Supply Output N A on 16 25 32 40W K 10V_RTN 10V Power Supply Output N A on 16 25 32 40W Notes 1 For a CEFD SSPA J8 external circular connector is routed internally to J10 on the M C PC assembly AS 8876 refer to Table 2 4 2 Non KST specific SSPA application J8 external circular connector is routed internally to J11 on the M C PC assembly AS 8876 refer to Table 2 5 3 For a T...

Страница 39: ...WTA heater timer complete active low E HPA_IN2 Input from TWTA TWT temperature fault active low F HPA_IN3 Input from TWTA high voltage on active low G HPA_IN4 Input from TWTA summary fault active low H GND Status control return J ANA_IN Analog input from TWTA 0 to 10VDC K GND Analog signal return 2 4 1 10 REF IN Connector J9 The REF IN connector J9 allows the user to operate the system with an ext...

Страница 40: ...cent unit MODE_2_IN L MODE_2_IN Mode input wires to adjacent unit MODE_2_OUT M MODE_1_IN Mode input wires to adjacent unit MODE_1_OUT N DL_OL_IN D L online wires to adjacent unit DL_OL_IND P UL_OL_IN U L online input wires to adjacent unit UL_OL_IND R DL_FLT_IN D L fault input wires to adjacent unit DL_FLT_OUT S UL_FLT_IN U L fault input wires to adjacent unit UL_FLT_OUT T CONTINUITY Continuity de...

Страница 41: ...nnection to the HPA J8 connector on the converter unit 2 4 2 2 8 Watt SSPA Connections The 8 Watt SSPA has a Type N female 50Ω connector J1 at one end for the Ku Band input and a WR 75 waveguide isolator J2 at the other end for the Ku Band output Also at the input is the M C control power cable connector J3 for connection to the HPA J8 connector on the converter unit The HPA s cooling fan is exter...

Страница 42: ...g fuses in the 16 Watt SSPA use 6 3 amp 3AG fuses 2 each AC Line Input Connector J3 AC Power Connection Pin Function Color A Line Brown B Neutral Blue C Ground Green Yellow Mating connection is molded power cord Comtech PN CA 84914 0223 Optional 48V DC DC Power Connection Pin Function A VDC B Ground C VDC D No Connect Mating connector is a Comtech P N CN STPG04F01 Amphenol PT06E 12 4S SR AC IN GND...

Страница 43: ...n MN KST2000AB IOM 2 15 Figure 2 5 I O Connectors for the 16 Watt SSPA Connectio n Function Description Mating Connector J1 RF Input N Type Female N Type Male J2 M C Interface ITT KPT02E 12 105 ITT KPT06E 12 105 J3 AC DC Line Main Power See above tables ...

Страница 44: ...Ku Band Satellite Transceiver Revision 9 Installation MN KST2000AB IOM 2 16 Figure 2 6 Output Connection for the 16 Watt SSPA Waveguide ...

Страница 45: ...put and output connections are shown in Figure 2 7 Figure 2 7 25 32 40 Watt SSPA Note When replacing fuses in the 25 32 40 Watt SSPA use 6 3 amp 3AG fuses 2 each AC Line Input Connector J3 AC Power Connection Pin Function Color A Line Brown B Neutral Blue C Ground Green Yellow Mating connection is molded power cord Comtech PN CA 84914 0223 ...

Страница 46: ...Type Female N Type Male J2 M C Interface ITT KPT02E 12 105 ITT KPT06E 12 105 J3 AC DC Line Main Power See tables above Figure 2 8 I O Connectors for the 25 32 40 Watt SSPA Optional 48V DC DC Power Connection Pin Function A VDC B Ground C VDC D No Connect Mating connector is a Comtech PN CN MS PLST4F01 ITT Cannon CA06COM E 18 10SB ROHS 4 06 ...

Страница 47: ...Ku Band Satellite Transceiver Revision 9 Installation MN KST2000AB IOM 2 19 Figure 2 9 Output Connection for the 25 32 40 Watt SSPA Waveguide ...

Страница 48: ... a WR 75 waveguide flange The RF output of the LNA is a type N female 50Ω connector The LNA power supply is applied to the RF output connector normally 15 V at 250 mA 2 4 4 LNB Connections Note The power supply for the LNB is supplied by the KST 2000B The RF input of the LNB is a WR 75 waveguide flange The RF OUT REF PWR IN connector of the LNB is a type N 50Ω connector It supplies the block conve...

Страница 49: ...he first time Refer to Figure 3 1 for system setup Note Ensure that the termination selected for the HPA output is sized to handle the HPA output power 1 Apply power to the KST 2000A B 2 After a few seconds ensure that the GREEN TX ON LED is flashing and the fault LED is extinguished Refer to Section 4 if this is not the case 3 Using a KP 10 or PC equipped with a terminal or Windows based M C pro ...

Страница 50: ... Figure 3 1 Single Thread System If the communication parameters for the system are not known the Win dows based M C system has a facility that will search all combinations of address baud rate and parity until communication is established with the system Using the KP 10 or terminal program send a miscellaneous command such as EQUIPMENT TYPE see Appendix B 8 and confirm a response is dis played Th...

Страница 51: ...le external faults execute the appropriate HPA Power and Heater commands See Appendix B 4 HPA commands 5 Turn the RF output of the up converter ON 1 See Appendix B 3 system con figuration commands 2 There should be no up converter faults at this time 6 Using an appropriate frequency meas uring device ensure that the output of the HPA measured through the cou pler or attenuator is at the correct fr...

Страница 52: ... the desired RX operating frequency 1 See Appendix B 3 2 There should not be any existing receive system faults 3 See Appendix B 9 3 Using an appropriate power measuring device attached to the IF OUT connector J4 set the down converter attenuator until the desired downlink gain is attained See Appendix B 3 Note At this point there should be no existing faults 4 1 Execute a Clear Stored Faults comm...

Страница 53: ...g used RS 485 or RS 422 see page 2 6 of this manual If necessary connect directly to KST unit A use RS 232 if the cabling is available Use a terminal emulator and poll the KST with the command AS_ cr this will globally poll the KST for it s address which is the most common problem Delete If the communication parameters for the system are not known the Windows based M C system has a utility that wi...

Страница 54: ... Repeat step 14 for Unit B downlink 13 Turn the RF output of the up converters of Unit A and B On See Appendix B 3 14 Execute a Reset Redundancy Fault command to Units A and B See Appendix B 9 15 1 At this point there should not be any existing faults 2 Execute a Clear Stored Faults command to clear the fault logs of Unit A and Unit B wait a few moments 3 Execute a System Fault Status command to U...

Страница 55: ...ach KST 2000A B must have a different serial address for the M C through the RJU 2000 to work properly Also due to the parallel nature of the M C interface only EIA 485 and EIA 422 communications are supported through this device 2 places 2 places PL 8085 2 Figure 3 2 1 1 Redundant System Block Diagram ...

Страница 56: ...ription Two KST 2000A B systems combined with the RJU 2000 form a highly flexible 1 1 re dundant transceiver system There are three modes of operation supported requiring re mote intervention only in the case of initial setup Figure 3 3 shows the front panel of the RJU 2000 Figure 3 3 RJU 2000 Front Panel ...

Страница 57: ...correct AGC operation in the offline up link The RJU 2000 houses an RX IF transfer switch that is used to select the proper down converter output for application to the RX IF output port J11 The offline down con verter output is internally terminated within the RJU 2000 This switch is not accessible to the user The redundant system always maintains the position of this switch to corre spond to the...

Страница 58: ...S style male connector It routes position commands and indicators from the TX switch to each KST 2000A B Refer to Table 3 1 for connector pinout Table 3 1 Connector J1 Pinout Description Pin Description A Switch position A command 500 ms 28VDC pulse B Switch command common C Switch position B command 500 ms 28VDC pulse D Switch position A indicator D and E connected position A E Switch position in...

Страница 59: ... switch position A indicator G RX_IND_A RX switch position B indicator H RX_IND_A RX switch position A indicator J TX_IND_B TX switch position B indicator K TX_IND_A TX switch position A indicator L A_IND_COM Unit A indicator common M A_CMD_COM Unit B command common N GND Ground P TX_SW_CMD TX switch position B command R RX_SW_CMD RX switch position B command S IF_SW_CMD IF switch position A comma...

Страница 60: ... 485 TX RX or EIA 422 TX C TX RX RX EIA 485 TX RX or EIA 422 RX D TX RX TX EIA 485 TX RX or EIA 422 TX E N C No connection F N C No connection G N C No connection H N C No connection J GND Ground K N C No connection L GND Ground M RESET Reset momentary low resets system N GND Ground P N C No connection R GND Ground S 12V 12VDC KP 10 power supply output T 2 4 wire EIA 485 open EIA 422 ground opera ...

Страница 61: ... 485 TX RX or EIA 422 TX C TX RX RX EIA 485 TX RX or EIA 422 RX D TX RX TX EIA 485 TX RX or EIA 422 TX E N C No connection F N C No connection G N C No connection H N C No connection J GND Ground K N C No connection L GND Ground M RESET Reset momentary low resets system N GND Ground P N C No connection R GND Ground S 12V 12VDC KP 10 power supply output T 2 4 wire EIA 485 open EIA 422 ground opera ...

Страница 62: ...IA 422 RX D TX RX TX EIA 485 TX RX or EIA 422 TX E ULA_FLT_NC Uplink A fault relay closed fault F ULA_FLT_CO M Uplink A fault relay common G ULA_FLT_NO Uplink A fault relay open fault H N C No connection J GND Ground K N C No connection L GND Ground M RESET Reset momentary low resets system N GND Ground P N C No connection R GND Ground S 12V 12VDC KP 10 power supply output T 2 4 wire EIA 485 open ...

Страница 63: ... J11 Nominal im pedance 50Ω unbalanced RX IF OUT Connector J11 The RX IF OUT connector J11 is a type N female connector used to connect the RX IF signal 70 or 140 MHz from the online KST 2000A B down converter to the modem Nominal impedance is 50Ω unbalanced TX IF IN Connector J12 The TX IF IN connector J12 is a type N female connector used to route the 70 or 140 MHz IF signal from a modem through...

Страница 64: ...2000 1 1 interconnect cable TX and RX waveguide switches The RJU 2000 provides TX and RX IF signal routing functions and command and status signal routing throughout the system The 1 1 interconnect cable routes status and control signals between the KST 2000A Bs and the TX RX switches through the RJU 2000 IMPORTANT This cable also designates the A Unit and B Unit KST 2000A B so strict attention mu...

Страница 65: ...Ku Band Satellite Transceiver Revision 9 Operation MN KST2000AB IOM 3 17 Unit A Unit B Figure 3 5 Redundant KST 2000A B System Showing Units A and B Designation ...

Страница 66: ...Ku Band Satellite Transceiver Revision 9 Operation MN KST2000AB IOM 3 18 Figure 3 10 shows the positions of the A side on the redundant HPA A B Figure 3 6 Redundant HPA Assembly ...

Страница 67: ...Ku Band Satellite Transceiver Revision 9 Operation MN KST2000AB IOM 3 19 Figure 3 11 shows the position of the A side on the redundant LNA B assembly A B Figure 3 7 Redundant LNA B Assembly ...

Страница 68: ...ble operating modes of the redundant KST 2000A B are Manual mode Automatic independent switching Automatic chain switch dependent In order to enable any backup operating mode a KP 10 or a PC running a terminal or Windows based M C system is required The user will not be able to enable backup operation unless the RJU 2000 and two KST 2000A B s are connected via the 1 1 inter connect cable The backu...

Страница 69: ...cur For example A fault in an online uplink will cause the the offline KST 2000A B to place its uplink online by transferring the TX waveguide switch to its position In this scenario the downlink path remains unchanged until a fault occurs in the online downlink If a standby link is faulted no switching will occur until either the A or B link fault clears Automatic chain switch dependent switching...

Страница 70: ...e OCVCXO to shift its operating frequency to maintain frequency lock with the external input The 10 MHz OCVCXO is a high stability low phase noise crystal oscillator It has a tun ing voltage input which can be used to fine tune the oscillator frequency When the KST 2000A B is operating without an external 5 or 10 MHz input the M C generates a bias voltage which can be changed remotely That sets th...

Страница 71: ...B M C as sembly 3 8 Monitor and Control M C The Monitor and Control M C monitors the KST 2000A B and provides configuration updates to the up converter down converter and HPA when necessary Refer to Figure 3 13 Figure 3 9 Monitor and Control M C Block Diagram The KST 2000A B configuration parameters are maintained on battery locked RAM which provides recovery after power down The M C functions inc...

Страница 72: ...s The three fault relay outputs are failsafe They will indicate a fault in the event of a power outage The three relays are uplink fault downlink fault and summary fault The M C has built in redundancy logic It reads switch position and external status in formation from the waveguide switches and the other KST 2000A B It provides control information based on these inputs The M C has a step up powe...

Страница 73: ...d Converter Module Block Diagram The 70 MHz 140 MHz IF input is first amplified and then applied to an electronically variable attenuator This attenuator is controlled via the local M C to provide calibrated 1dB attenuation steps over a 20 dB attenuation range The signal is then amplified and heterodyned with a fixed frequency LO1 The desired sideband of this process is selected via bandpass filte...

Страница 74: ...gure 3 16 accepts an RF signal in the range of 10 95 to 12 75 GHz and translates it to an output frequency in the range of 950 to 1700 MHz It does this by pre selecting the RF frequency range and block converting using one of three phase locked DROs The DROs operate at 10 0 10 75 and 11 3 GHz and are automatically selected when the down converter is tuned The down converter can supply 15V through ...

Страница 75: ...r as shown by the dotted lines in Figure 3 13 950 1700 MHZ 72 MHZ REF 70 140 MHZ 720 70 790 140 1 6 2 35 GHZ 0 20 dB STEP ATTENUATOR INTERFACE L BAND MONITOR Figure 3 13 L Band to IF Down Converter Block Diagram The 950 to 1700 MHz input is first pre selected and then heterodyned with a local oscil lator in the range of 1 6 to 2 35 GHz to generate the first IF signal of 650 MHz The 650 MHz signal ...

Страница 76: ... value despite the effects of aging operating temperature or cabling loss This is not a Automatic Level Control ALC function but a true AGC that maintains the gain of the system constant independ ent of input and output absolute levels This is important to multicarrier operation when individual carriers turn On Off and the level of the remaining carriers must remain unaf fected This function is de...

Страница 77: ...30 dB approximately below saturation The calibration data is stored in a non volatile memory within each SSPA making all SSPAs interchangeable without loss of system gain accuracy The estimate of output power corresponds to the detector voltage linearly interpolated between nearby frequency and power steps stored in memory The main processor reads the estimated output power from the SSPA and compu...

Страница 78: ... saturation 2 The new value of UCA is displayed at the user s interface Even if the input power is reduced the new value of UCA will remain fixed Loop fault occurs when the Gain Error is nonzero for 5 out 255 iterations of the processor control loop 1 A top level AGS_Fault is reported 2 Excessive cable loss between the converter unit and the SSPA can cause this condition 3 If the AGC is enabled an...

Страница 79: ...NT INPUT POWER EXCESSIVE INPUT POWER and LOOP faults are not monitored or reported as faults The status of the AGS fault is displayed as OK In this mode the system gain is not accurately defined as in the AGC mode because the accuracy of the up converter s programmable attenuator and the static gains of the up link amplifiers determine the gain When this mode is selected UCA will display as an int...

Страница 80: ...________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______...

Страница 81: ...The TX ON indicator is GREEN when illuminated and the FAULT indi cator is RED When prime power is applied to the KST 2000A B and the HPA is transmitting power the TX ON indicator is a steady GREEN The indicator flashes when prime power is ap plied but the HPA is not transmitting The FAULT indicator is a steady RED when any fault is detected by the internal M C processor The REMOTE connector J2 has...

Страница 82: ...hange in status Therefore when a fault oc curs that constitutes one status change and when that fault clears another event occurs The M C can store up to 10 fault status conditions After 10 fault status changes are logged no further logging can take place until the Clear Stored Faults add CLSF command is issued Refer to Appendix B Table B 7 for the fault commands to access the fault status of each...

Страница 83: ... REDUNDANCY SWITCH X2 X2 REDUNDANCY FAULT LINE CABLE X2 X2 AGC FAULTS EXCESSIVE INPUT POWER INSUFFICIENT INPUT POWER AGC LOOP CONVERGE LNA FAULTS LNA MODULE FAULT X1 X1 X1 REFERENCE FAULTS EXTERNAL 10MHz LOCK DETECT X X EXTERNAL PHASE NOISE X X EXTERNAL RANGE X X 72MHz LOCK DETECT X X OSCILLATOR WARM COLD X UC FAULTS UC MODULE X X X X X S BAND SYNTHESIZER LOCK DETECT X X X X X KU BAND SYNTHESIZER ...

Страница 84: ...E X1 X1 X1 X1 X1 BIAS VOLTAGE 1 9 X1 X1 X1 X1 X1 5 VOLT POWER SUPPLY X1 X1 X1 X1 X1 9 75 VOLT POWER SUPPLY X1 X1 X1 X1 X1 INTER PROCESSOR COMMUNICATIONS X1 X1 X1 X1 X1 HPA FAULTS OEM SSPA HPA MODULE X1 X1 X1 X1 X1 HPA FAULTS TWTA HPA MODULE X1 X1 X1 X1 X1 HIGH VOLTAGE X1 X1 X1 X1 X1 TEMPERATURE X1 X1 X1 X1 X1 Legend Note Fault Alarm Relay Test Points Connector Pins 1 SUMMARY FAULT J2 a NO c COM b ...

Страница 85: ...ethod of controlling or monitoring the KST2000 transceiver The keypad display unit is a weatherproof 16 character LED display with 6 keys to provide data entry to the KST 2000A B The display characters can easily be seen in bright sunlight as well as dark environments While the keypad display is a weatherproof device a case mounted swing away cover elements adds a second layer of protective isolat...

Страница 86: ... and monitor the status of the terminal Figure 5 1 KST 2000A B Terminal Keypad The front panel features a 16 character 2 line LED display and a 6 button keypad which provides for sophisticated functions yet is easy to use All functions are accessible at the front panel by entering one of six main categories of SELECT menus Configuration CONFIG Monitor Faults Utility System Redundancy REDUNDCY ...

Страница 87: ...e keys are used to move to the next selection or to move the cursor for certain functions S and T These keys are used primarily to change configuration data numbers but are also used at times to move from one section to another The terminal front panel control uses a tree structured menu system Figure 5 3 to access and execute all functions The base level of this structure is the sign on message w...

Страница 88: ...Ku Band Satellite Transceiver Revision 9 Operation MN KST2000AB IOM 5 4 Figure 5 3 Principle Menu Trees ...

Страница 89: ... the arrow keys From the SELECT menu any one of six functional categories may be selected Configuration functions CONFIG Monitor functions Fault functions Utility functions System functions Redundancy functions Press W or X to move from one selection to another Figure 5 4 Select Menu When the desired category is displayed on line 2 press ENTER Once the category has been entered move to the desired...

Страница 90: ...or X to view the selected configuration parameters To change a configuration parameter press ENTER to begin the change process at which point the arrow keys can be used to make the changes After the changes are made and the display represents the correct parameters execute the change by pressing ENTER When ENTER is pressed the necessary programming is initiated by the KST 2000A B To undo a paramet...

Страница 91: ...ar stored parameters in the preset location to the left of the To recall any of the present selections use the SELECT menu and select 1 2 or 3 Press ENTER RF OUTPUT Programs the RF output to ON WRM or OFF The OFF command will keep the RF output turned off under all conditions The WRM command is a conditional ON command telling the RF output to come on after the unit is warmed up and meets the stab...

Страница 92: ...the M C will monitor the LNA current and compare it to the stored value If the LNA deviates by 30 a fault will be declared REF ADJ Allows adjustment of the 10 000 MHz reference frequency to compensate for long term drift The setting varies from 1 to 255 XFLT EN Enables or disables the external fault input When ON is selected all of the HPA SSPA and TWTA faults work normally When OFF is selected th...

Страница 93: ...P Up converter temperature monitor Range 40 to 90 C 40 to 194 F D C TEMP Down converter temperature monitor Range 40 to 90 C 40 to 194 F HPA TEMP HPA temperature monitor Range 40 to 90 C 40 to 194 F M C TEMP M C temperature monitor Range 40 to 90 C 40 to 194 F PWR FCTR The PWR FCTR is a power factor of the output power of the CEFD HPA In actuality power factor is a very close indication of the out...

Страница 94: ...lect the desired fault category Pressing Enter will enter the indicated faults category and display the current status OK or FLT for the displayed KST 2000A B system Pressing any arrow key will display the next monitored system Pressing the Clear key once will return the user to the faults menu while pressing the Clear key twice will return the user to the main SELECT menu Note The upper level SEL...

Страница 95: ...nd synthesizer lock fault U C PROG U C programming fault FLT Indicates the main M C has lost communication with the micro controller on the up converter assembly CEFD HPA Comtech EF Data High Powered Amplifier HPA HPA fault FLT indicates the HPA module micro controller has reset 5V PWR 5 VDC FLT indicates the HPA 5VDC is out of the allowable range 9 75V 9 75 VDC FLT indicates the HPA 9 75 VDC is o...

Страница 96: ...T indicates the M C cannot communicate to one or more devices on the M C assembly REDUNDCY Redundancy TXS Transmit switch FLT indicates the WG switch transmit side not operating or not indicating position properly RXS Receive switch FLT indicates the WG switch receive side not operating or not indicating position properly IFS IF switch Located in the RJU 503 FLT indicates the IF switch not operati...

Страница 97: ...e 5 9 Utility Menu Function Description M C Firmware Displays the M C firmware number and revision The release date can be displayed by pressing the down arrow key T D C Firmware Displays the down converter firmware number and revision The release date can be displayed by pressing the down arrow key T U C Firmware Displays the up converter firmware number and revision The release date can be displ...

Страница 98: ...ion of one of three receive bands can be set KST 2000B only Function Description COMM Selects between Remote and Local operation Remote mode is the default mode of communication The communications priority is defined as 1 Remote control 2 FSK With REMOTE is selected the EIA 232 EIA 422 and EIA 485 communication is active FSK will be enabled approximately 10 seconds after the last EIA 232 EIA 422 o...

Страница 99: ... and 19200 REM ADDR Programs the terminal remote address On entry the currently selected address of the terminal is displayed with the flashing cursor on the ones character Press S or T to change the desired address of the terminal from 1 to 255 The W or X arrow buttons allow skipping to the tens or hundreds columns Press ENTER to execute the change REM COMM Programs the parity bit to EVEN ODD or ...

Страница 100: ...n Figure 5 11 Redundancy Menu The redundancy menu category provides all of the necessary controls to configure a redundant KST 2000A B system The backup transceiver can be manually switched to be the online unit with a few button presses Auto dependency or independency can switch an up converter down converter or both if desired and a real time backup status monitor can be observed by selecting th...

Страница 101: ... occurs on either link The other unit will pick up control of both the UL and DL when this occurs Auto independent AUTO IND forces the unit to automatically switch from an OFFLINE mode to an ONLINE mode depending upon whether or not a fault occurred in the other unit It forces the unit to independently relinquish control of either the UL or DL when a fault occurs in that specific link When a fault...

Страница 102: ...Ku Band Satellite Transceiver Revision 9 Operation MN KST2000AB IOM 5 18 NOTES ...

Страница 103: ...NGS This section describes the equipment outlines for the following components 2 and 4 Watt SSPA 8 Watt SSPA 16 Watt SSPA 25 32 40 Watt SSPA Ku Band LNA LNB KST 2000A B Converter Refer to the applicable section for more detailed information ...

Страница 104: ...quipment Outline 12 96 329 06 6 00 152 40 10 96 278 26 N CONNECTOR KPT 10 PIN MALE 8 32 UNC 2A GND STUD 3 89 98 88 FOR 1 4 HEX BOLT OR NUT TYPICAL 8 72 221 49 3 89 98 88 1 04 26 42 1 12 28 60 WR75 WAVE GUIDE 6 THREAD THRU 5 36 136 14 5 56 141 22 2 94 74 63 1 64 41 61 Figure A 1 2 and 4 Watt SSPA Equipment Outline ...

Страница 105: ...Ku Band Satellite Transceiver Revision 9 Equipment Outline Drawings MN KST2000AB IOM A 3 A 2 8 Watt SSPA Equipment Outline Figure A 2 8 Watt SSPA Equipment Outline ...

Страница 106: ... 25 209 55 USE 4X 1 4 20 X 375 LG HARDWARE 98 24 77 10 50 266 7 98 24 77 2 19 55 58 4 00 101 6 DIMENSIONS ARE IN INCHES AND MILLIMETERS 4X 1 4 20 X 375 DP TAPPED HOLES KPT 10 PIN MALE AC POWER INLET N CONNECTOR 2X FUSE HOLDERS WR75 WAVE GUIDE 10 50 266 7 98 24 77 98 24 77 1 81 46 02 4 75 120 65 14 62 371 22 8 38 212 73 1 04 26 42 1 12 28 5 5 08 128 91 4 19 106 5 4X 6 TAPPED HOLES ...

Страница 107: ...5 32 40 Watt SSPA Equipment Outline Figure A 4 25 32 40 Watt SSPA Equipment Outline 10 50 266 70 2 30 58 42 2 30 58 42 5 25 133 35 3 75 95 25 6X 1 4 20 x 375 DP 15 10 383 54 9 0 0 288 60 10 31 261 90 N RF IN 2X FUSE HOLDERS 20 03 508 76 11 50 292 10 3 12 79 35 5 35 35 89 WR 75 WAVEGUIDE GROOVED ...

Страница 108: ...lite Transceiver Revision 9 Equipment Outline Drawings MN KST2000AB IOM A 6 A 5 Ku Band LNA Equipment Outline Figure A 5 Ku Band LNA Equipment Outline NOTES DIMENSIONS ARE IN INCHES AND MILLIMETERS TOLERANCE 02 0 5 ...

Страница 109: ...Ku Band Satellite Transceiver Revision 9 Equipment Outline Drawings MN KST2000AB IOM A 7 A 6 KST 2000A B Converter Equipment Outline Figure A 6 KST 2000A B Converter Equipment Outline ...

Страница 110: ...Equipment Outline Drawings MN KST2000AB IOM A 8 A 7 Ku Band LNB Equipment Outline Note All dimensions are in inches millimeters are in parenthesis 5 67 143 8 5 12 130 0 2 55 65 1 04 26 4 1 58 40 Type N Figure A 7 Ku Band LNB Equipment Outline ...

Страница 111: ...upport Department if there is a problem or concern regarding the firmware Firmware Revision Version Remarks 7084 1 K 2 1 1 No FSK and Keypad 9364 1 D 3 1 1 FSK and No Keypad 10303 1 D 1 1 5 FSK and Keypad Remote control and status information are transferred via an EIA 485 EIA 422 or EIA 232 serial communications link Commands and data are transferred on the remote control communications link as A...

Страница 112: ... 2 1 Start Character A single character precedes all messages transmitted on the remote link This character flags the start of a message This character is for commands for responses B 2 2 Device Address The device address is the address of the KST 2000A B which is designated to receive a transmitted command or which is responding to a command Valid device addresses are 1 to 3 characters long and i...

Страница 113: ...age for a recognized command which cannot be implemented or has parameters which are out of range add ER3_UNRECOGNIZABLE COMMAND cr lf error message for unrecognizable command or bad command syntax add ER4_CONTROLLER IN LOCK MODE cr lf controller in LOCK mode DISABLE lock mode before changing any configurable parameters add ER5_HARD CODED PARAMETER cr lf attempt to change a system hard coded param...

Страница 114: ...esponses B 3 System Configuration Commands Commands and responses for setting the basic system parameters of uplink and downlink frequency and attenuation for making an adjustment on the internal reference and for disabling the RF output are as specified in the following paragraphs Commands are included for setting and selecting programmed frequency and attenuation values for locking out changes i...

Страница 115: ... variable in 1 0 dB steps Note No decimal point is displayed when UAGC is OFF and the UCA range is extended to 55 dB Down Converter Attenuation Command Response Status Response add DCA_nn n cr add DCA_nn n cr lf add DCA_ cr add DCA_nn n cr lf Where nn n 0 0 to 20 0 in dB variable in 1 0 dB steps Select Preset Configuration Command Response Status Response add SEL_n cr add SEL_n cr lf add SEL_ cr a...

Страница 116: ...mand Response Status Response add LM_xx cr add LM_xx cr lf add LM_ cr add LM_xx cr lf Where LM LK Lock or DS Disable Default DS Address Select Command Response Status Response add AS_xxx cr add AS_xxx cr lf add AS_ cr add AS_xxx cr lf Where add Present Address xxx New Address Default Address 1 Baud Rate Select Command Response Status Response add BR_xxxxx cr add BR_xxxxx cr lf add BR_ cr add BR_xx...

Страница 117: ...C voltage supplied to HPA LNA or LNB Power Enable Command Response Status Response add LPE_xxx cr add LPE_xxx cr lf add LPE_ cr add LPE_xxx cr lf Where xxx ON OFF Default is OFF Transmit IF Output Power up Condition Command Response Status Response add TXPU_xxxx cr add TXPU_xxxx cr lf add TXPU_ cr add TXPU_xxxx cr lf Where xxxx Last or OFF where Last last known state OFF OFF This command selects t...

Страница 118: ...K FLT M C Soft Reset Command Response add SRM_ cr Note All current variables are retained as system restarts M C Hard Reset Command Response add HRM_ cr Note All current variables will be updated to default values UC Automatic Gain Control Command Response add UAGC_xxx cr add UAGC_xxx cr lf Where xxx ON OFF Default OFF on cold start or hard reset UAGC will be set to the last programmed state on su...

Страница 119: ...dd HS_ cr RF_xxx cr HPA_xxx cr BV1_xxx cr 9 75V_xxx cr 5V_xxx cr PROG_xxx cr SFLT_ cr lf RF Output ON OFF Actual Status HPA Converter Module OK FLT Bias Voltage 1 OK FLT 9 75 V Power Supply OK FLT 5 Volt Power Supply OK FLT Inter processor Communications OK FLT Number of stored faults 1 to 10 HP Current Faults 8 Watt SSPAs Current Faults Comtech EF Data Command Response add HS_ cr add HS_ cr RF_xx...

Страница 120: ... to 9 Down Converter Current Faults Command Response add DS_ cr add DS_ cr DC_xxx cr LSYN_xxx cr KSYN_xxx cr LLSYN_xxx cr LKSYN_xxx cr PROG_xxx cr SFLT_ cr lf Down Converter Module OK FLT L Band Synthesizer Lock Detect OK FLT Ku Band Synthesizer Lock Detect OK FLT Latched L Band Synthesizer Lock Detect OK FLT Latched Ku Band Synthesizer Lock Detect ON FLT Inter processor Communications OK FLT Numb...

Страница 121: ...verter Stored Faults Command Response add USF_ cr add USF_ cr lf RF_xxx cr UC_xxx cr SSYN_xxx cr KSYN_xxx cr LSSYN_xxx cr LKSSYN_xxx cr PROG_xxx cr lf Where 0 to 9 USF_ NO_FAULT or RF Output ON OFF Actual Status Up Converter Module OK FLT S Band Synthesizer Lock Detect OK FLT Ku Band Synthesizer Lock Detect OK FLT Latched S Band Synthesizer Lock Detect OK FLT Inter Processor Communications OK FLT ...

Страница 122: ...M TWTA only HPA_xxx cr HPA Converter Module OK FLT TEMP_xxx cr Temperature OK FLT HV_xxx cr High Voltage ON OFF 16 Watt SSPAs Stored Faults Command Response add HSF_ cr add HSF_ cr RF_yyy cr HPA_xxx cr BV1_xxx cr BV2_xxx cr BV3_xxx cr BV4_xxx cr BV5_xxx cr 9 75V_xxx cr 5V_xxx cr PROG_xxx cr SFLT_ cr lf Where 0 to 9 HSF_ NO_FAULT or RF Output ON OFF Actual Status HPA Converge Module OK FLT Bias Vol...

Страница 123: ...Converter Module OK FLT L Band Synthesizer Lock Detect OK FLT Ku Band Synthesizer Lock Detect OK FLT Latched L Band Synthesizer Lock Detect OK FLT Latched Ku Band Synthesizer Lock Detect OK FLT Inter Processor Communications OK FLT Common Equipment Stored Faults Command Response add CSF_ cr add CSF_ cr lf M C_xxx cr 7V_xxx cr 7V_xxx cr 12V_xxx cr 17V_xxx cr TXS_xxx cr RXS_xxx cr IFS_xxx cr RFLC_xx...

Страница 124: ... FW nnnnn ddr cr mm dd yy cr lf Where xxx yyy zzz Software version number 0 0 0 to 999 999 999 nnnnn Firmware number 0 to 99999 dd Firmware dash number 0 to 99 r Firmware revision or A to Z Query Serial Numbers Status Response add SNUM_ cr add SNUM_ cr UC_xxxxxxxxx cr HPA_xxxxxxxxx cr DC_xxxxxxxxx cr M C_xxxxxxxxx cr lf Where xxxxxxxxx Serial Number 0 to 999999999 Query Assembly Numbers Command Re...

Страница 125: ...s in that specific link When a fault occurs on a link for one unit the other unit will pick up control of the specific link AUTO DEP which forces the unit to automatically switch from an OFFLINE mode to an ONLINE mode depending upon whether or not a fault has occurred in the other unit It forces the unit to relinquish control of both the UL and DL when a fault occurs on either link The other unit ...

Страница 126: ...cr add XFM_xxx cr lf ad XFM_ cr add XFM_xxx cr lf Where xxx ON which notifies the M C control system that when the following conditions have been met to take special action 1 If the 25 Watt SSPA is connected to the M C system and 2 If that 25 Watt SSPA signals an active summary fault and 3 If that fault is the only UL fault is the entire system then 4 Perform normal redundant switching however Do ...

Страница 127: ...stallation C 2 1 Spar arm mount C 2 2 Pole mount round or square Note The converter unit can be installed anywhere on or near the antenna C 3 SSPA installation C 3 1 For offset feed mount antenna C 4 LNA installation C 4 1 For offset feed mount antenna C 5 Cable installation Installation procedures and hardware kits have been verified on the following antennas PRODELIN 1 8 2 4 and 3 8M Channel Mas...

Страница 128: ... antenna spar arm assembly Figure C 1 KST 2000A Single Thread System Installed on Spar Arm C 1 Tools Required Qty Description 1 1 1 1 1 1 3 8 drive ratchet Adjustable wrench 7 16 x 3 8 drive socket or 7 16 drive wrench Metric equivalent 12mm 6 pt 1 2 x 3 8 drive socket or 1 2 box wrench Metric equivalent 13mm 6 pt 5 16 box wrench or nut driver 7 64 Allen wrench ...

Страница 129: ...ce Mounting Kit KT 7945 1 Channel Master Offset Mounting Kit KT 7595 1 Kits KT 7805 KT 7945 and KT 7595 include Continued on next page Qty Description Qty Description 2 Spar support bracket Spar Mount Only Comtech EFData Part s FP 3175 included in KT 7805 KT 7945 FP 7579 1 included in KT 7595 1 U Bracket and scale overlay 20 30 40 50 10 0 20 10 30 40 50 90 80 60 70 90 60 70 80 Comtech EFData Part ...

Страница 130: ...10 32x1 2SP 3 1 4 20 hex nut Comtech EFData Part HW 5 16 18HEXNT 2 5 16 16 x 3 4 bolt Comtech EFData Part HW 5 16 163 4B included in KT 7595 2 5 16 flat washer Comtech EFData Part HW 5 16 FLT included in KT 7595 2 5 16 split washer Comtech EFData Part HW 5 16 split included in KT 7595 2 5 16 16 Hex nut Comtech EFData Part HW 5 16 16 HEXNUT included in KT 7595 1 LNA Installation Kit Comtech EFData ...

Страница 131: ...par Arm Mounting Instructions 1 Position the Converter unit against the spar arm of the satellite dish and bolt the two spar support brackets to the Converter unit brackets as shown in Figure C 2 Utilize four each 1 4x 20x1 bolts 1 4 split and 1 4 flat washers Figure C 2 Typical Converter Unit Installation on Spar ...

Страница 132: ...s to RFT 20 5 16 split washer Comtech EFData Part HW 5 16 SPLIT 6 1 4 flat washer Comtech EFData Part HW 1 4 FLT Used to attach Unistruts to RFT 20 5 16 flat washer Comtech EFData Part HW 5 16 FLT 6 1 4 split washer Comtech EFData Part HW 1 4 SPLIT Used to attach Unistruts to RFT 12 5 16 18 hex nut Comtech EFData Part HW 5 16 18HEXNT 8 Pipe block Comtech EFData Part HW BLK PIPE2 8 Used for round p...

Страница 133: ...e spring nuts used for the pipe blocks Figure C 3 KST 2000A Converter with Mounting Brackets 2 Position two spring nuts into the channel of one of the remaining Unistrut channels With the mounting holes facing the ends of the channel fasten two pipe blocks loosely to the spring nuts with the hardware 2 each 5 16 bolts split and flat washers 3 Place the channel with pipe blocks against the mounting...

Страница 134: ...nels ensure that the threaded rods from the channels mounted to the converters are aligned with holes in the mating channels Center these rods with the channels as well as possible and tighten the hardware 6 Thread a 5 16 nut split flat washer and flat fitting plate on the remaining ends of the threaded rods This hardware is to secure the mating Unistrut channels from the opposite side of the pole...

Страница 135: ...d Equipment Mounting MN KST2000AB IOM C 9 Figure C 5 Front View of Converter Installed on Round Pole C 2 2 3 Converter Square Pole Mounting Instructions For square pole mount please follow the instructions in Section C 2 2 2 but do not use the pipe blocks ...

Страница 136: ... 2 Install the appropriate gasket on the SSPA isolator a If only one of the mounting surfaces has a groove use the thin gasket b If both mounting surfaces have grooves then use the thick gasket 3 Position the SSPA rounded fins down on the antenna OMT and fasten using the 6 hardware from KT 2820 8 each socket head screws flat split washers and nuts 4 Attach the interface bracket to the feed support...

Страница 137: ...el Master antenna Attach the interface bracket from below the feed support with the 5 16 hardware and nut plate 5 Apply the scale overlay to the outward facing side of the SSPA U bracket See Note Either side of the U bracket may face out depending on the requirements of a particular installation 6 Slide the SSPA U bracket horizontally between the tabs of the interface bracket Lift and guide the U ...

Страница 138: ...e UNI channel from the rear of the SSPA Refer to 8 Figure C 7 Center and square the U bracket to the SSPA and fasten using 1 4 20 x 5 8 bolts 1 4 split washers and 1 4 flat washers Thread the 10 32 spade screw on the interface bracket and tighten to complete mounting Figure C 7 SSPA Installed Horizontal side UNI channel U bracket with overlay Interface bracket ...

Страница 139: ...stallation Kit for LNA KT 2820 is included in the following mounting kits KT 7805 1 KT 7945 1 KT 7595 1 Kit KT 2820 Qty Description Qty Description 4 O ring Comtech EFData Part 32P1037 8 6 32 x 7 8 socket head cap screw Comtech EFData Part HW 6 32x7 8 SHCS 16 6 flat washer Comtech EFData Part HW 6 FLT 8 6 split washer Comtech EFData Part HW 6 SPLIT 8 6 Hex nut Comtech EFData Part HW 6 32HEXNUT ...

Страница 140: ...et in place on the antenna OMT and fasten using the 6 hardware from KT 2820 8 each socket head screws flat split washers and nuts C 5 Cable Installation Care should be exercised in cable installation Install the cables using the most direct route and secure with clamps and ties Avoid all sharp bends Cable connectors used in outdoor applications must be sealed to avoid leakage particularly N type c...

Страница 141: ...llation D 2 1 Spar arm mount D 2 2 Pole mount round or square Note The converter units can be installed anywhere on or near the antenna D 3 1 1 SSPA installation D 3 1 For offset feed mount antenna D 4 1 1 LNA installation D 4 1 For offset feed mount antenna D 5 Cable installation Installation procedures and hardware kits have been verified on the following antennas PRODELIN 1 8 2 4 and 3 8M Chann...

Страница 142: ...alled on the antenna s feedhorn assembly Figure D 1 1 1 System Installed on Spar Arm D 1 Tools Required Qty Description 1 1 1 1 1 1 3 8 drive ratchet Adjustable wrench 7 16 x 3 8 drive socket or 7 16 drive wrench Metric equivalent 12mm 6 pt 1 2 x 3 8 drive socket or 1 2 box wrench Metric equivalent 13mm 6 pt 5 16 box wrench or nut driver 7 64 Allen wrench ...

Страница 143: ...unt only 2 20 Unistrut Comtech EFData Part FP 7582 1 12 1 4 20 x 5 8 bolt Comtech EFData Part 03P1131 Used to Attach Unistruts to converters 4 5 16 flat washer Comtech EFData Part HW 5 16 FLT 16 1 4 flat washer Comtech EFData Part HW 1 4 FLT Used to Attach Unistruts to converters 4 5 16 split washer Comtech EFData Part HW 5 16 SPLIT 16 1 4 split washer Comtech EFData Part HW 1 4 SPLIT Used to Atta...

Страница 144: ...the switch box between the converters Ensure that all items are oriented correctly and fasten with the 1 4 hardware twelve each bolts split and flat washers Note It may be necessary to loosen the hardware on the switch box in order to align the mounting holes between the Unistrut channels and the converter brackets 3 Using a Spar support bracket as a guide position two spring nuts in each of the U...

Страница 145: ...Ku Band Satellite Transceiver Revision 9 Redundant Equipment Mounting MN KST2000AB IOM D 5 Figure D 2 Converters and SSPAs on Spar Arm ...

Страница 146: ... 1 4 20 x 5 8 bolt Comtech EFData Part 03P1131 Used to attach Unistruts to converters 28 5 16 split washer Comtech EFData Part HW 5 16 SPLIT 16 1 4 flat washer Comtech EFData Part HW 1 4 FLT Used to attach Unistruts to converters 20 5 16 flat washer Comtech EFData Part HW 5 16 FLT 16 1 4 split washer Comtech EFData Part HW 1 4 SPLIT Used to attach Unistruts to converters 12 5 16 18 hex nut Comtech...

Страница 147: ... and centering the two center slots of the channel with the mounting holes of the switch box Fasten with the provided 1 4 hardware 4 each bolts split and flat washers 2 Position the converters with fins down and mounting brackets facing upwards leaving a gap between roughly the width of the RJU 2000 switch box refer to Figure D 3 Position and orient the channels with the switch box attached onto t...

Страница 148: ... with the locating notches engaged in the openings of the channel Thread a 5 16 nut split and flat washer onto the threaded rods leaving 1 of rod remaining Thread that end of the threaded rods through the flat fitting plates and fully into the spring nuts do not bottom out Using one of the mating channels ensure that the threaded rods from the channels mounted to the converters are aligned with th...

Страница 149: ...Ku Band Satellite Transceiver Revision 9 Redundant Equipment Mounting MN KST2000AB IOM D 9 Figure D 4 Rear View of Converters Installed on Pole Figure D 5 Front View of Converters Installed on Pole ...

Страница 150: ...trut channels of the SSPA assembly The threaded holes in the spring nuts must be aligned with the holes in the Spar support brackets and should be centered in the Unistrut channels 2 Position the SSPA redundant assembly on the Spar arm of the antenna switch facing the feed support Fasten the assembly to the Spar arm with the provided Spar support brackets and 5 16 hardware 4 each bolt split and fl...

Страница 151: ...mbly in place on the antenna OMT with gasket and fasten with the provided 6 hardware 4 each screws splits and nuts 8 each flats D 5 Cable Installation Care should be exercised in cable installation Install the cables using the most direct route and secure with clamps and ties Avoid all sharp bends Cable connectors used in outdoor applications must be sealed to avoid leakage particularly N type con...

Страница 152: ...Ku Band Satellite Transceiver Revision 9 Redundant Equipment Mounting MN KST2000AB IOM D 12 NOTES ...

Страница 153: ...ntrol commands via the FSK and the terminal responds The terminal parameters can be viewed and configured from menus on the modem front panel Just as the modem can be controlled via a EIA 232 or EIA 485 bus from an external PC so can the terminal The commands from the computer are transmitted to the modem The address is decoded if the address indicates a message is for the terminal the modem trans...

Страница 154: ...ich is in charge of the process of monitor and control The controller is the only device which is permitted to initiate at will the transmission of data Targets are only permitted to transmit when they have been specifically instructed to do so by the controller All bytes within a packet are printable ASCII characters less than ASCII code 127 In this context the Carriage Return and Line Feed chara...

Страница 155: ...ssage E 2 3 Address The terminal address is fixed as Modem Address 1 IMPORTANT The controller sends a packet with the address of a target the destination of the packet When the target responds the address used is the same address to indicate to the controller the source of the packet The controller does not have its own address E 2 4 Instruction Code This is a three character alphabetic sequence w...

Страница 156: ... the parameter defined by the preceding instruction code should be set to the value of the argument s which follow it For example in a message from controller to target UFQ 13750 0 would mean set the transmit frequency to 13750 MHz The code controller to target is used as the query operator and is used to indicate that the target should return the current value of the parameter defined by the prec...

Страница 157: ...o set a parameter to a particular value then if the value sent in the argument is not valid the target will acknowledge the message by replying for example with UFQ with no message arguments This indicates that there was an error in the message sent by the controller The code target to controller is only used as follows If the controller sends an instruction to set a parameter to a particular valu...

Страница 158: ...ce Carriage Return Line Feed ASCII code 13 and code 10 Both indicate the valid termination of a packet E 3 Commands and Query The following tables provide the FSK Remote Control Commands A AGC E 17 AMP E 9 ANM E 12 ASF E 23 F FRW E 15 L LCS E 8 LFL E 8 LOK E 18 LSF E 23 H HSF E 21 R RCS E14 REF E 8 RET E 10 RSF E 21 RUS E 14 C CAL E 8 CAS E 17 CDS E 18 CES E 17 CFS E 16 CHS E 18 CID E 15 CLS E 9 C...

Страница 159: ...n current mode UFQ Down Converter Frequency DFQ 7 bytes Command or Query add DFQ nnnnn n cr add DFQ cr lf add DFQ cr add DFQ nnnnn n cr lf Where nnnnn n 10950 0 to 12750 0 MHz in 1 MHz steps DFQ message ok DFQ received ok but invalid arguments found DFQ message ok but not permitted in current mode DFQ Up Converter Attenuation UAT 4 bytes Command or Query add UAT nn n cr add UAT cr lf add UAT cr ad...

Страница 160: ...dd SPA xxx cr add SPA cr lf add SPA cr add SPA xxx cr lf Where xxx new address SPA message ok SPA received ok but invalid argument found SPA message ok but not permitted in current mode SPA LNA Calibrated CAL None Command only add CAL cr add CAL cr lf Calibration to allow system to determine nominal LNA power consumption performed at initial installation only Note Not applicable for a TX only syst...

Страница 161: ...cr lf Where n Power Enable 0 Off 1 On x Fault Enable 0 Disabled 1 Enabled CLS message ok CLS received ok but invalid argument found CLS message ok but not permitted in current mode CLS HPA Power Enable AMP 1 byte Command or Query add AMP x cr add AMP cr lf add AMP cr add AMP x cr lf Where x 0 Off or 1 On Default is 1 On Note For EF Data SSPA only which turns ON OFF DC voltage supplied to HPA AMP m...

Страница 162: ...lt is 0 Off Note The Off command keeps the RF output Off under all conditions The WARM command is a conditional On command telling the RF output to come On after the unit is warmed up and meets the stability requirements while the On command is an override instructing the output to be On and ignores the warm start UMU message ok UMU received ok but invalid arguments found UMU message ok but not pe...

Страница 163: ...target to controller Query Instruction Code and qualifier Query Serial Number UC n a 9 bytes Query only add SNU cr add SNU xxxxxxxxx cr lf Where xxxxxxxxx 000000000 to 999999999 SNU message ok SNU received ok but invalid argument found SNU message ok but not permitted in current mode SNU Query Serial Number HPA n a 9 bytes Query only add SNH cr add SNH xxxxxxxxx cr lf Where xxxxxxxxx 000000000 to ...

Страница 164: ... 999999999 SND message ok SND received ok but invalid arguments found SND message ok but not permitted in current mode SND Up Slice Information String n a 41 bytes Query only add UIF cr add UIF fffff bbbb iii aa llll gg s pp rr www cc cr lf Where fffff Start freq in MHz bbbb Freq range in MHz bandwidth iii IF freq in MHz aa max attenuation llll IFLO gg Cal GAIN in dB s 0 for Lowside LO 1 for Highs...

Страница 165: ...ifier Down Slice Information String n a 41 bytes Query only add DIF cr add DIF fffff bbbb iii aa llll gg s pp rr www cc cr lf Where fffff Start freq in MHz bbbb Freq range in MHz bandwidth iii IF freq in MHz aa max attenuation llll IFLO gg Cal GAIN in dB s o for Lowside LO 1 for Highside LO pp rated output power in dBm rr max expected Raw Gain in dB www Channel bandwidth in MHz cc Allowed user att...

Страница 166: ... nnnnn n cr DFQ nnnnn n cr UMU x cr UAT nn n cr DAT nn n cr SEL n cr AGC n cr HPA xy cr lf Where x HPA power enable as AMP y HPA fault enable as KFE Note The converter configuration status command causes a block of data to be returned by the addressed unit The block of data reflects the correct configuration status RCS message ok RCS received ok but invalid arguments found RCS message ok but not p...

Страница 167: ...ermitted in current mode CID Firmware Numbers n a 52 bytes Query only add FRW cr add FRW aaaaaaabbbbbbcccccccddddddeeeeeeeffffffggggggghhh hhh cr lf Where aaaaaaa M C FW with dash and rev eg 7084 1G bbbbbb M C FW version eg 010012 for 01 00 12 ccccccc Up converter FW with dash and rev dddddd Up converter FW version eeeeeee Down converter FW with dash and rev ffffff Down converter FW version gggggg...

Страница 168: ...d SNM cr add SNM aaaaaaaaabbbbbbbbcccccccccdddddddd cr lf Where aaaaaaaaa M C Serial Number bbbbbbbb Up Converter Serial Number ccccccccc Down Converter Serial Number dddddddd HPA firmware Serial Number SNM message ok SNM received ok but invalid arguments found SNM message ok but not permitted in current mode SNM Summary Fault Status n a 1 byte Query only add SFS cr add SFS x cr lf Where x 0 No Fa...

Страница 169: ...RS cr add CRS ABCDEF cr lf Where A REF Source 0 INT 1 EXT B Oscillator State 0 COLD 1 WARM C 72M Lock Status 0 OK 1 FLT D EXT REF Lock Status 0 OK 1 FLT 2 NA E EXT REF Phase_N Status 0 OK 1 FLT 2 NA F EXT REF Range Status 0 OK 1 FLT 2 NA Note IF REF source is INT then D E F shall be 2 NA CRS message ok CRS received ok but invalid arguments found CRS message ok but not permitted in current mode CRS...

Страница 170: ...tus 0 OK 1 FLT D Interprocessor Comm Status 0 OK 1 FLT CUS message ok CUS received ok but invalid arguments found CUS message ok but not permitted in current mode CUS Concise Down Converter Status n a 4 bytes Query only add CDS cr add CDS ABCD cr lf Where A Overtemperature Status 0 OK 1 FLT B L Band Synthesizer Lock Status 0 OK 1 FLT C Ku Band Synthesizer Lock Status 0 OK 1 FLT D Interprocessor Co...

Страница 171: ...Command target to controller Query Instruction Code and qualifier Up Converter Stored Faults n a 6 bytes Query only add USF X cr add USF ABCDEF cr lf or add USF NO_FAULT cr lf Where A Overtemperature Status 0 OK 1 FLT B S Band Synthesizer Lock Status 0 OK 1 FLT C Ku Band Synthesizer Lock Status 0 OK 1 FLT D Latched S Band Synthesizer Lock Status 0 OK 1 FLT E Latched Ku Band Synthesizer Lock Status...

Страница 172: ... Query Description of arguments note that all arguments are ASCII numeric codes that is ASCII codes between 48 and 57 Response to Command target to controller Query Instruction Code and qualifier 0 OK 1 FLT D Latched L Band Synthesizer Lock Status 0 OK 1 FLT E Latched Ku Band Synthesizer Lock Status 0 OK 1 FLT F Interprocessor Comm Status 0 OK 1 FLT X Stored Fault Locations 0 to 9 ...

Страница 173: ...r State 0 COLD 1 EXT C 72M Lock Status 0 OK 1 FLT D EXT REF Lock Status 0 OK 1 FLT E EXT REF Phase_N Status 0 OK 1 FLT 2 NA F EXT REF Range Status 0 OK 1 FLT 2 NA X Stored Fault Locations 0 to 9 RSF message ok RSF received ok but invalid arguments found RSF message ok but not permitted in current mode RSF HPA Stored Faults 2 and 4 Watt n a 5 bytes Query only add HSF X cr add HSF ABCDE cr lf or add...

Страница 174: ...1 FLT G Interprocessor comm Status 0 OK 1 FLT X Stored Fault Locations 0 to 9 HSF message ok HSF received ok but invalid arguments found HSF message ok but not permitted in current mode HSF HPA Stored Faults 25 Watt n a 13 bytes Query only add HSF X cr add HSF ABCDEFGHIJKLM cr lf or add HSF NO_FAULT cr lf Where A Overtemperature Status 0 OK 1 FLT B 9 75V Status 0 OK 1 FLT C 5V Status 0 OK 1 FLT D ...

Страница 175: ... Query only add ASF X cr add ASF ABC cr lf or add ASF NO_FAULT cr lf Where A Loop Convergence 0 OK 1 FLT B Excessive Input Power EIP 0 OK 1 FLT C Insufficient Input Power IIP 0 OK 1 FLT X Stored Fault Locations 0 to 9 ASF message ok ASF received ok but invalid arguments found ASF message ok but not permitted in current mode ASF Common Equipment Stored Faults n a 4 bytes Query only add CSF X cr add...

Страница 176: ...r Faults ULR None Command only add ULR cr add ULR cr lf ULR message ok ULR received ok but invalid arguments found ULR message ok but not permitted in current mode n a Clear Latched Down Converter Faults DLR None Command only add DLR cr add DLR cr lf DLR message ok DLR received ok but invalid arguments found DLR message ok but not permitted in current mode n a Set Receive Band SRB 1 byte Command Q...

Страница 177: ... CLR CLEAR COMP Compensation CR Carriage Return D C Down Converter Db Decibels dBc Decibels referred to carrier dBm Decibels referred to 1 0 milliwatt DC Direct Current DCA Down Converter Attenuation DCF Down Converter Frequency DCT Down Converter Temperature DL Down Link Fault DLA Down Link Fault Unit A DLB Down Link Fault Unit B DLD Down Converter Lock Detect Fault DLM Down Link Mode Auto or Man...

Страница 178: ...e LFE LNA Fault Enable LK Lock LNA Low Noise Amplifier LNB Low Noise Block LO Local Oscillator m milli 10 3 M C Monitor and Control Ma Milliamp Max Maximum MHz Megahertz 106 Hertz Min Minimum or Minute ns Nanosecond 10 9 second OCVCXO Oven Controlled Voltage Controlled Crystal Oscillator OMT Orthogonal Mode Transducer P P Peak to Peak PC Printed Circuit PLO Phase Locked Oscillator PROG Program PS ...

Страница 179: ...P Converter Attenuation UCF Up Converter Frequency UCT Up Converter Temperature UL Up Link Fault ULA Up Link Fault Unit A ULB Up Link Fault Unit B ULD Up Converter Lock Detect Fault ULM Up Link Mode Auto or Manual ULS Up Link Switch A or B UTM Up Converter Tuning Voltage Fault V Volts VAC Volts Alternating Current VDC Volts Direct Current VSAT Very Small Aperture Terminal VSWR Voltage Standing Wav...

Страница 180: ...Ku Band Satellite Transceiver Revision 9 Glossary MN KST2000AB IOM g 4 NOTES ...

Страница 181: ...Description 3 10 Connector J2 Pinout Description 3 10 Converter Unit 1 1 1 10 1 11 2 4 2 5 Converter Unit External Connections 2 5 Converter Unit Specifications 1 10 1 11 D Description of Options 2 3 Downlink Setup 3 4 E Electrical Connections 2 4 F Fan J4 Pin Assignments 2 13 Fault Indication 4 1 Fault Isolation 4 2 Features 1 4 Full Ku Band Transmit and Receive Coverage 1 4 H HPA Connector J8 Pi...

Страница 182: ...Showing Units A and B Designation 3 17 Redundant LNA B Assembly 3 19 Redundant System 2 2 3 5 3 7 Redundant System Components 2 2 REF IN Connector J9 2 11 Reference Oscillator 3 22 Remote Connector J2 2 6 Remote M C Connector J2 Pin Assignments 2 6 RF IN Connector J7 2 9 RF OUT Connector J6 2 9 RFTA Remote Interface Connector J4 Pinout Description 3 12 RFTB Remote Interface Connector 3 13 RFTB Rem...

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