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D-6

APPENDIX D

MDS 05-2415A01, Rev. A

Radio RF TX Power Control

U10 is a 100-position 100k EEPOT that controls the radio’s RF TX power. U10 is configured
as a ratiometric resistor that sources a voltage to control the transmitter power. The voltage
being sourced by the EEPOT is controlled by the micro-controller on the transceiver’s main
circuit board. The setting is controlled by the firmware through the diagnostics channel, both
locally and remotely.

Radio Center Frequency Control

U9 is a 100-position 100k EEPOT that controls the radio carrier frequency. U9 is configured
as a ratiometric resistor that sources a voltage to control the carrier frequency. The voltage
being sourced by the EEPOT is controlled by the micro-controller on the transceiver’s main
PC board. The setting is controlled by the firmware through the diagnostics channel, both
locally and remotely.

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Summary of Contents for MDS 4310

Page 1: ...ed as magenta colored strings of text When your cursor is positioned over a hotlink the open hand will change into a pointing finger Clicking on the link location will move you to the associated section of the manual In some manuals the hotlinks are only found in the Table of Contents one link for each major section These links are indicated by magenta boxes with dashed lines PRINTING This file co...

Page 2: ...RADIO TRANSCEIVER ANTENNA INTERFACE TD IN RD TR MR CD 13 8 VDC Installation Operation Field Maintenance Covering the MDS 4310 Transceiver with the 05 2314Axx PCB the MDS 4350 4355 Packaged Systems and All Basic Options MDS 05 2415A01 Rev A SEPTEMBER 1994 ...

Page 3: ...ing location that allows easy access to the connectors on the end of the radio and allows an unobstructed view of the LED status indicators 3 Install and connect the antenna system to the radio Chapter 2 Use good quality low loss coaxial cable Keep the antenna feedline as short as possible Avoid sharp bends in the coaxial cable Preset the antenna in the direction of the master station Properly wat...

Page 4: ...VER Including the MDS 4350 and MDS 4355 PACKAGE MODEL RADIOS INSTALLATION OPERATION AND FIELD MAINTENANCE Copyright 1994 Microwave Data Systems All Rights Reserved MICROWAVE DATA SYSTEMS 175 Science Parkway Rochester New York 14620 Telephone No 716 242 9600 FAX No 716 242 9620 ...

Page 5: ...ies Inc PROCOMM DataStorm Technologies Inc If further assistance with this product is required please contact MICROWAVE DATA SYSTEMS A Division of California Microwave Incorporated 175 Science Parkway Rochester New York 14620 Telephone No 716 242 9600 FAX No 716 242 9620 Copyright 1994 by Microwave Data Systems All rights reserved ...

Page 6: ...dule Internal P N 03 1958A01 1 11 Hand Held Terminal 1 12 RS 232 to RS 422 Converter Assembly P N 01 2358A01 1 12 TTL to RS 232 Converter Assembly 1 12 CHAPTER 2 INSTALLATION OVERVIEW 2 1 SURFACE MOUNTING 2 2 EXTERNAL CONNECTIONS 2 4 ANTENNA Connector 2 4 DC IN Power Connector 2 4 INTERFACE Connector 2 4 INTERFACE Connector Pin Functional Descriptions 2 7 FRONT PANEL INDICATORS 2 11 TRANSCEIVER CO...

Page 7: ... Output Check 3 10 Received Signal Strength Indication RSSI Check 3 10 PROGRAMMING AND TEST COMMANDS 3 11 HAND HELD TERMINAL SETUP DEFAULTS 3 13 HAND HELD TERMINAL WIRING 3 14 Adapter Plug Wiring 3 14 HHT ALTERNATIVES 3 15 Cable Wiring for a PC or ASCII Terminal 3 15 CHAPTER 4 FIELD TESTS AND ADJUSTMENTS GENERAL 4 1 TEST EQUIPMENT REQUIRED 4 1 CONSTRUCTING A DATA TERMINAL EMULATOR 4 3 REMOTE MAINT...

Page 8: ...CONTROL 5 4 TRANSMIT AUDIO 5 5 PLL SYNTHESIZER 5 5 RS 232 DATA INTERFACE 5 5 LED INDICATORS 5 5 CHAPTER 6 TROUBLESHOOTING This section contains basic field troubleshooting assistance for the transceiver system APPENDIX A 1200 BPS BELL 202T COMPATIBLE MODEM INTRODUCTION A 1 SPECIFICATIONS A 1 ALIGNMENT A 1 THEORY OF OPERATION A 2 APPENDIX B 4800 BPS FSK MODEM INTRODUCTION B 1 SPECIFICATIONS B 1 INS...

Page 9: ...J3 F 3 Power for Accessories F 3 Back up Battery F 3 ANALOG INTERFACE BOARD CONNECTIONS P N 03 1105A21 Rev C F 4 Audio and Keyline J1 F 4 Additional Interface Connections F 4 Audio Alignment F 5 DIGITAL RS 232 TTL INTERFACE BOARD CONNECTIONS P N 03 1467A21 F 11 Summary F 11 RS 232 Digital Interface Connections F 12 TTL Digital Interface Connections F 12 Additional Interface Connections F 12 Order ...

Page 10: ...5 Interface Connector Pin Functions 2 6 Table 2 2 External Indicators For Radios Without Internal Modems 2 11 Table 2 3 External Indicators For Radios WithInternal Modems 2 12 Table 2 4 J11 External Interface TTL RS 232 2 13 Table 2 5 J14 Receiver Audio Output Normal Inverted 2 13 Table 2 6 Signal Loss versus Cable Length and Type 2 16 Table 3 1 Diagnostic and Control Capabilities 3 10 Table 3 2 P...

Page 11: ...ring 4 4 Figure 4 2 Construction Options for Building a Data Terminal Emulator 4 4 Figure 4 3 VCO Lock Voltage Test Point 4 9 Figure 4 4 1200 bps AFSK Modem 4 13 Figure 4 5 4800 BPS FSK Modem 4 15 Figure 4 6 9600 BPS FSK Modem 4 17 Figure 4 7 Remote Maintenance Module 4 19 Figure 4 8 Remote Maintenance Screen 4 23 Figure 4 9 MDS 4310 Transceiver PC Board Test Points and Adjustments 4 25 Figure 5 1...

Page 12: ...igure G 4 Exploded View of AC Version of System G 4 Figure G 5 Plugs for Primary Power TB2 and Interface TB1 Connectors G 7 Figure G 6 Keying Options for the 03 2110A01 Analog Interface Utility PC Board G 10 Figure G 7 MDS 4355 Packaged System Wiring Diagram with the 03 2110A01 Analog Interface Utility Board G 11 Figure G 8 Analog Interface Assembly 03 2110A01 G 12 Figure G 9 MDS 4355 Packaged Sys...

Page 13: ...lation hookup and checkout of the MDS 4310 Transceiver Recommendations are also provided for feedline and antenna selection connection to external equipment jumper configuration settings and other requirements for planning a successful radio installation Chapter 3 Programming and Diagnostics gives procedures for connecting a Hand Held Terminal or a standard ASCII Terminal to the radio for accessin...

Page 14: ...gnostic and modem options The MDS 4350 and MDS 4355 are alternate weatherproof models which include the MDS 4310 radio plus a power supply back up battery and interface utility board all mounted in a NEMA 4X enclosure Appendix F of this manual covers the main features of the MDS 4350 and Appendix G covers the MDS 4355 Package The contents of this manual center on the MDS 4310 Data Transceiver All ...

Page 15: ...dems Digital Modem Digital Radio Digital Mode These terms relate to equipment or operating modes using non linear frequency shift keying modulation and detection techniques The signal may alternate between two or three discrete frequencies FSK depending on equipment configuration Generally these products or modes operate in the 4800 and 9600 bps range MDS 4310 MODULATION TECHNIQUES The MDS 4310 Tr...

Page 16: ...lt of the transmitter unkeying too soon The soft carrier dekey feature can be selected or modified by using the HHT CONTROL INPUTS AND OUTPUTS Four control inputs and outputs are provided on the MDS 4310 Data Transceiver s 25 pin D INTERFACE connector They are 1 Receiver Squelch This output goes low when the receiver is squelched and is pulled high when the receiver squelch is open When the squelc...

Page 17: ...on is subject to configuration and change Contact MDS to verify certification 4 3 1 0 R N 1 5 1 Figure 1 1 MDS 4310 Model Number Codes MAIN PRINTED CIRCUIT BOARD PCB VARIATIONS The MDS 4310 Transceiver may be equipped with a 2314Axx main PC board or a 2013Axx main PC board The significant difference is the frequency range Although the two PC boards are similar this manual covers transceivers with ...

Page 18: ...d TX RX Spacing 0 Simplex 5 MHz 10 MHz standard others are possible consult with factory Primary Power Model 4310 Transceiver Voltage 13 8 Vdc Nominal 10 5 16 5 Vdc Operating Range TX Supply Current 2 0 A typical 2 5 A Maximum at 13 8 Vdc Varies with power output adjustment RX Supply Current 65 mA typical without options installed or LED indicators turned OFF Standby Current Radio Inhibited 14 mA ...

Page 19: ...x 19 5 241 x 445 x 495 mm Not including mounting hardware or connector housings Model 4355 Packaged Radio 6 5 x 11 85 x 13 75 165 x 301 x 350 mm Not including mounting hardware or connector housings Weight Model 4310 Transceiver Maximum 3 5 Lbs 1 6 kg w all options installed Model 4350 Packaged Radio Maximum 33 Lbs 15 0 kg w all options installed Model 4355 Packaged Radio Maximum 21 Lbs 9 53 kg w ...

Page 20: ...ics Level Adjustable 20 to 10 dBm for 2 5 kHz Deviation Model 4310 600 Ohms Unbalanced Model 4350 600 Ohms Balanced 4 Wire Audio Frequency Response Model 4310 1 dB 3 dB 50 3000 Hz Model 4350 1 dB 3 dB 300 3000 Hz Soft Carrier Dekey Programmable from 0 to 255 ms in 1 ms steps Soft Carrier Dekey factory set to 0 ms with no internal modem 0 ms with MDS 1200 baud modem 2 ms with 4800 FSK internal mode...

Page 21: ...6 at 110 dBm Digital FSK at 9600 bps BER 1x10 6 at 108 dBm Intermodulation 75 dB Minimum EIA IF Selectivity 100 dB minimum at Adjacent Channel 25 kHz one generator method 20 dB quieting Desensitization 70 dB minimum EIA on 25 kHz channels 65 dB minimum EIA on 12 5 kHz channels Spurious and Image Rejection 85 dB Minimum Analog Audio Output Characteristics Frequency Response Refer to 1 kHz Model 431...

Page 22: ... Received Signal Strength Indicator RSSI Out of Lock Alarm PTT PTT added with internal modem RS 232 Compatible Data Lines RXD TXD RTS CTS DCD DSR ETC TC RC w synchronous FSK only Data Rates AFSK 50 to 9600 bps Asynchronous audio interface using external modems 30 to 1200 bps Asynchronous w internal Bell 202T compatible modem FSK 50 to 4800 bps Asynchronous w internal direct FSK interface 4800 bps ...

Page 23: ...certifications available on special orders FCC INFORMATION USA PART 90 Transmitter Model E5M5LL2013 Channel Capacity 1 Frequency Tolerance 0 00015 Output Power Continuously Variable 0 1 to 2 watts 0 1 to 5 watts Necessary Bandwidth 12 5 kHz 25 kHz Emission Designators F1D 16K0 16K0 F2D 16K0 16K0 F3D 16K0 16K0 Contact MDS for information on availability and governmental approvals in other countries...

Page 24: ...e with RS 232 or TTL interface provided through the radio s INTERFACE DB 25 connector Audio Processing Module Internal P N 03 2301A01 The Audio Processing Module can be installed to support applications where no keying circuits are provided by a modem or remote terminal unit RTU The assembly senses the presence of a tone on the transmit audio line and keys the transmitter The VOX assembly provides...

Page 25: ...ou ordered your radio system with Remote Maintenance capability all of these elements will have been installed and tested at the factory If Remote Maintenance is being added to the system refer to the instructions included with the upgrade kit for detailed installation procedures Publication Number 05 2104A01 Consult the factory if you have questions regarding the capabilities of your existing sys...

Page 26: ... connects between the transceiver INTERFACE connector and the external equipment making the transceiver appear as an RS 232 device TOP COVER OPTION 1 Modem PC Assembly or Audio Processing Module OPTION 2 Remote Maintenance Module or Diagnostic Loopback Module INTERFACE CONNECTOR DETACHABLE ADJUSTABLE MOUNTING BRACKETS 2 TRANSCEIVER PC BOARD BOTTOM COVER LED ANNUNCIATOR DISPLAY DC POWER INPUT ANTEN...

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Page 28: ... hardware and software configuration information and actual performance measurements Included in the data sheets are the transmit and receive frequency as measured receive sensitivity transmitter power output and modulation characteristics as well as pre programmed loopback code In most cases the transceiver requires no alignment during installation The following installation steps are for a typic...

Page 29: ...eceive signals through refinement of the antenna heading 10 Verify basic system operation by establishing data communications between the remote and the master stations This should complete the basic steps in the installation of the transceiver More detailed information will follow in this chapter should the user experience difficulties or choose to make more detailed operational checks SURFACE MO...

Page 30: ...ew fasteners not provided through the four holes in the mounting bracket 3 If mounting surface is uneven use three fasteners instead of four to prevent warping of the mounting bracket AAAAAAAAAAAAAA IN T E R F A C E KL TX RX DC IN D C IN A N T E N N A OL 2 0 in 51 mm 2 25 in 57 mm 5 6 inches 143 mm Figure 2 1 Mounting Dimensions Front View MOUNT BRACKETS WITH THESE TWO HOLES FOR ALTERNATE MOUNTING...

Page 31: ...ol 3900 MIL Type UG 21 for RG 8 cable The exact mating connector type depends on the cable used If large diameter rigid or semi rigid coaxial cable is used for the feedline see Antenna and Feedlines section use a short length of RG 8 or RG 214 U cable between the transceiver and the feedline A three foot section of RG 214 U cable with connectors at both ends P N 19 1323A01 is available from MDS Th...

Page 32: ...and DCD DSR is true whenever the radio and modem are powered up and the transmitter is automatically keyed when RTS goes high CTS is raised after the programmable delay factory default is 10 ms to allow time for the synthesizer to change frequency and for the receiver at the other end of the link to unsquelch This time can be modified by the user to suit specific system timing requirements with th...

Page 33: ... 6 and the logic source in the remote terminal unit RTU Table 2 1 DB 25 Interface Connector Pin Functions 13 1 25 14 Viewed from Outside or from Plug s Solder Cups Pin Number and Function Pin Number and Function 1 Shield 2 Transmit Data In TXD 3 Received Data Out RXD 4 Request To Send RTS 5 Clear To Send CTS 6 Data Set Ready DSR 7 Signal Ground 8 Data Carrier Detect DCD 9 Transmit Audio Input 10 R...

Page 34: ...hether or not a modem is installed PIN 1 Shield Connected to ground negative supply potential at the radio PC board PIN 2 TXD Transmitted Data Input without modem This pin is connected to the data input port of the microcontroller and is used with an external programming terminal with internal modem As above this pin is also connected to the data input port TXD of the internal modem and is RS 232 ...

Page 35: ...he modem or RTU and the other end to Pin 9 and Pin 7 of the INTERFACE connector with internal modem The order wire audio output appears on Pin 9 whenever the external order wire assembly is connected Transmit audio from the modem is cut off internally within the transceiver when order wire is in use This applies only to PTT PTT will not cut off the internal modem output PIN 10 Receiver Unsquelched...

Page 36: ...yed when the pin is at less than one volt open circuit the transmitter is off and the receiver is active See pin 16 description PIN 15 TC Transmit Clock This pin is used only on applications requiring a synchronous interface This pin provides a signal to clock transmit data bits out of the terminal connected to the radio The Transmit Clock signal is compatible only with RS 232 interfaces PIN 16 Pu...

Page 37: ...SSI will be within 3 dBm when displayed on the HHT 0 0 5 1 1 5 2 2 5 3 3 5 4 1 4 0 1 2 0 1 0 0 8 0 6 0 4 0 DC VOLTS SIGNAL LEVEL dBm Figure 2 4 Received Signal Strength Indicator Calibration Chart Typical PIN 22 Loopback Test Receive Audio Input A direct input to the loopback and diagnostics module s DTMF decoder Can be used with external DTMF encoder to simulate a polling request from a master st...

Page 38: ...signing an external interface circuit FRONT PANEL INDICATORS The radio is supplied with a set of six light emitting diode indicators LEDs that provide information on the status of key operating functions The indicators can be disabled if the jumper on the transceiver s main board at J11 pins 2 2 is removed With the pins bridged the display is enabled There are two versions of the plastic label for...

Page 39: ...verted to RS 232 12Vdc levels The function of J11 pins 3 4 allows the disabling of the LED indicators on the transceiver front panel Disabling the LEDs allows less current consumption in solar powered installations and other current sensitive installations With J11 pins 3 4 jumpered the LED driver IC is enabled and the LEDs function Conversely when the jumper is removed from J11 pins 3 4 the LED d...

Page 40: ... without first consulting MDS Systems Engineering Table 2 5 J14 Receiver Audio Output Normal Inverted LOCATION SHUNTED 1 2 Normal Audio 2 3 Inverted Audio Standard factory configuration 1 2 3 J14 Figure 2 6 Detail of Configuration Jumpers J14 J16 Full Duplex Option Connector J16 Pins 1 2 and J16 Pins 3 4 must be jumpered for normal remote operation The Full Duplex Option Connector is used only whe...

Page 41: ...us 10 ms is the factory default When RTS goes low the transmitter is unkeyed and CTS is set to low DCD Signal When the squelch circuit in the receiver senses the presence of a carrier the DCD line goes high When the squelch circuit in the receiver senses the lack of a carrier the RXD output is forced to a Mark condition and the DCD signal is set low RXD and DCD are signals on the INTERFACE connect...

Page 42: ... with minimal pattern distortion Any metallic object close to the antenna will distort the radiation pattern and in severe cases detune the antenna enough to cause a high VSWR on the antenna feedline CAUTION Strong fields near the antenna can interfere with the operation of low level RTU circuits and change the reported values of the parameters being monitored Also objects in the near field of the...

Page 43: ... has a loss of 0 55 dB at the same frequency but its cost is many times greater than RG 58A U In any point to multipoint system there will be a distribution of remote stations with some closer to the master station than others For the close in units feedline loss is not as important and 6 dB or more of loss can be acceptable For the furthest out remote units each decibel of loss directly affects b...

Page 44: ...to prevent moisture buildup in the connector In extreme cases rainwater can get into a connector and fill the entire feedline with water creating a high loss cable that will have to be replaced There are several good methods for weatherproofing these outside connections consult the cable or connector manufacturer for their recommended materials and procedures The feedline itself must also be insta...

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Page 46: ...ransceiver TERMINAL CONNECTION AND STARTUP Connecting the HHT to the transceiver is simple since the HHT interface cable includes a DB 25 adapter plug that allows direct connection to the radio s INTERFACE connector NOTE Before connecting the HHT to the transceiver verify the radio is connected to a continuous 13 8 Vdc supply Most often the transceiver is powered continuously but some solar powere...

Page 47: ...elow Z CTRL U K F A F1 V Q G B F2 SHIFT ESC W R 7 M 4 H 1 C F3 BKSP X 0 S 8 N 5 I 2 D F4 SPACE Y T 9 O 6 3 E F5 ENTER J L P ANTENNA INTERFACE TD IN RD TR MR CD 13 8 VDC Figure 3 1 Hand Held Terminal Connected to the MDS 4310 Transceiver F5 F4 F3 J3 R28 J1 J6 25 SW1 J5 R10 R9 F1 F2 T1 4 5 6 3 2 1 T2 4 5 6 3 2 1 V3 V2 V1 CR7 TB2 TB1 J4 J7 RS 232 INTERFACE 2 3 1 TB2 J3 Figure 3 2 MDS 4355 Packaged Tr...

Page 48: ...al or radio Opening The Diagnostic Channel The diagnostic channel between the HHT and the transceiver is automatically opened when a HHT is connected to the transceiver However if an older HHT or transceiver is being used it must be opened before HHT functions can be performed To manually open the diagnostic channel when using older HHTs or transceivers follow the steps below 1 After the HHT has c...

Page 49: ...ameters voltages signal strength etc are updated once every second to allow the technician to make adjustments while observing the HHT display In this way you do not need to invoke the diagnostic command each time a control is moved The Squelch Tail Eliminator circuit senses the end of the incoming data message by detecting the loss of the 1200 Hz mark idle tone and shutting off the receiver s aud...

Page 50: ...ammed in the radio until new information is entered USING THE HAND HELD TERMINAL Basic Operations Command Syntax The proper procedure for using the review commands is the command followed by an ENTER keystroke For the programming commands the appropriate command is followed by a SPACE keystroke followed by the information or values then ENTER See Programming Examples for further information Shift ...

Page 51: ...e the diagnostic channel when using older HHTs or transceivers type in CLOS ENTER The message DIAGNOSTICS IS CLOSED will be displayed indicating a closed condition At this point it will be noticed that either the running cursor or the stationary solid flashing cursor returns and that all further keystrokes will be ignored by the HHT another indication that the diagnostics channel is closed Z CTRL ...

Page 52: ...FRQ PRGMD TO 428 83750 MHZ if the information was entered correctly and accepted by the microcontroller 4 Program the new receive frequency by typing PRX SPACE SHIFT 438 83750 SHIFT ENTER again taking care to enter in all characters If the information was entered properly and accepted by the microcontroller the display will read RX FRQ PRGMD TO 438 83750 MHZ 5 Program the time out timer length by ...

Page 53: ... channel PASSWORD PROTECTION If password protection of programmed information frequency owner s name and message etc is used the PASS command followed by the correct four character password must be entered before the transceiver programming can be changed Without the proper password the programmed information and diagnostic data can only be reviewed and no access to the programming commands is pos...

Page 54: ...ITIONS Software is available for service personnel to use a MDS Master Station as a diagnostics tool for system monitoring and maintenance MDS 2000 Diagnostic and Control System software uses the master station to transmit a special message to all remote radios in a given system asking one remote radio at a time to respond with a test signal The test signal is analyzed by the master station and th...

Page 55: ...loopback code transmitted by an MDS master station it responds by keying its transmitter for several seconds with a continuous modulating tone The radio s signal strength and deviation can then be measured by the Master Station Advanced 2 With a radio set to Mode 2 critical diagnostic information available through a local HHT or personal computer is available over the RF channel to the Master Stat...

Page 56: ...d U Uninstalled5 Base Remote B Base High Side LO R Remote Low Side LO 6 IF LO Arrangement 0 45 MHz Low 7 RSSI Cal Status Y Calibrated N Uncalibrated 8 RF Power Status Y Calibrated N Uncalibrated OWNER S INFORMATION OWM Display Owner s Message OWN Display Owner s Name RADIO INFORMATION HREV Transceiver hardware revision level MD Transceiver manufacture date MO Model number of radio SER Serial numbe...

Page 57: ...Program CTS Delay in ms 2 255 ms no leading zeros 1 3 digits PSCD_xxx Program soft carrier dekey 2 255 ms no leading zeros 1 3 digits ETOT Enable Time out Timer DTOT Disable Time out Timer PTOT_xxx Program Time out timer sec 1 3 digits PPTT_xx Program Push to talk delay 0 31 ms A move of more than 6 MHz requires re alignment of the transceiver s tuned circuits Consult factory for details POWER FRE...

Page 58: ...reinitializing the HHT for use with MDS radio products Restoring the HHT Operation Defaults 1 Plug the HHT into the radio and apply power to the radio A small rectangular cursor will appear on the display 2 Put the HHT into the Setup Mode by pressing the following keys in sequence SHIFT CTRL SPACE The HHT responds with a screen display similar to that shown in Figure 3 3 A F1 B F2 1 C F3 2 D F4 3 ...

Page 59: ...being dropped The coiled cord is wired as a straight pin for pin assembly and the parts required to construct a replacement cable can be obtained from many electronics supply companies Although similar in appearance the cable set is not the same as an RJ 11 4 4 conductor telephone coiled cord Adapter Plug Wiring Figure 3 4 shows the internal wiring of the DB 25 interface adapter plug that is used ...

Page 60: ...C or terminal to the transceiver must connect the TXD RXD DSR and signal ground pins DB 25 INTERFACE connector pins 2 3 6 and 7 as shown in Figures 3 5 and 3 6 Pin 23 can be be connected to ground to automatically open the diagnostic channel If the PC or terminal is to be used for purposes other than diagnostics or programming do not connect Pin 23 NOTE A transceiver equipped with an internal mode...

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Page 62: ...MDS 4350 4355 packaged models For additional set up information on the MDS 4350 and MDS 4355 refer to Appendices F and G respectively NOTE All units are tuned at the factory for optimum performance Do not re tune any unit without first checking the performance as it is Retuning may not be necessary TEST EQUIPMENT REQUIRED Directional RF Wattmeter It must be equipped with a plug in element rated fo...

Page 63: ...controlled by the transceiver s micro controller and to use the built in test and diagnostic features of the radio NOTE To perform the tests in this chapter operators must be familiar with connecting the HHT opening and closing the Diagnostics Channel and issuing the required commands Chapter 3 Programming and Diagnostics contains complete instructions for using the HHT If desired a personal compu...

Page 64: ...nfigured for TTL an optional TTL to RS 232 adapter plug is available from MDS P N 03 2223A01 to allow connection of the Data Terminal Emulator an HHT or other RS 232 equipment This unit plugs between the transceiver s INTERFACE connector and the external equipment making the transceiver appear as an RS 232 device Contact the factory for ordering information If the TTL to RS 232 adapter plug is not...

Page 65: ...EYED Transceiver Interface Connector Figure 4 1 Remote Data Terminal Emulator Wiring SW1 and SW2 mounted inside a small enclosure SW1 RTS SW2 TXD SMALL ENCLOSURE Plastic or Metal TOGGLE SWITCHES SPST 3 CONDUCTOR CABLE DB 25 MALE CONNECTOR METHOD TWO S W 2 T X D S W 1 R T S METHOD ONE SMALL TOGGLE SWITCHES SPST Figure 4 2 Construction Options for Building a Data Terminal Emulator ...

Page 66: ...E Table 3 2 contains a complete list of HHT programming and control commands R M Use the SER command to read the serial number assigned to the transceiver NOTE To perform the tests in this chapter operators must be familiar with connecting the HHT opening and closing the Diagnostics Channel and issuing the required commands Chapter 3 Programming and Diagnostics contains complete instructions for u...

Page 67: ...ustments you must type RMST If the settings are not stored the radio will revert to the previous settings when the power is removed from the transceiver INTRODUCTION TO FIELD TESTS ADJUSTMENTS See Figure 4 9 The following test procedures in this chapter are arranged according to the hardware configuration of the MDS 4310 transceiver The primary difference between units is the presence of a modem n...

Page 68: ...his section describes basic checks that apply to all common configurations of the MDS 4310 transceiver The checks covered are Power supply Transmitter power output Antenna VSWR These checks should be made before starting any detailed troubleshooting or alignment of the transceiver See Figure 4 9 for the locations of adjustable controls on the transceiver motherboard Power Supply Check 1 Connect th...

Page 69: ...with battery power make sure that the battery is fully charged before attempting to set the transceiver output power If the power is set for 5 watts with reduced battery voltage the transceiver will put out more power when the battery becomes fully charged which may cause a violation of FCC rules and drain the battery more quickly than expected Antenna VSWR Check 1 Connect a directional wattmeter ...

Page 70: ...ange between transmit and receive modes This adjustment requires monitoring the lock voltage with a DC voltmeter on the transceiver motherboard or on the HHT using the LV command if the Remote Maintenance Module is installed 1 Place voltmeter at test point shown in Figure 4 3 or use the HHT to measure the VCO lock voltage The voltage should be between 2 and 7 Vdc 2 Key the radio with the KEY comma...

Page 71: ...e external modem or RTU Receive Audio Output Level The receive audio output level of the transceiver is factory set for 0 7 Vp p 10 dBm at 600 Ω at rated system deviation If a third party modem is used with the MDS 4310 consult its instruction manual to determine what audio input level the modem needs Should a different level be required adjust the Receive Audio Output Level R292 on the transceive...

Page 72: ...the deviation The ID DD com mands increment decrement the deviation in single steps while the INCD DECD commands make larger jumps by adding a space and a number to the command Example INCD_4 to increase the deviation by four steps out of 100 When finished type RMST to store the setting 4 Unkey the transmitter using the DKEY command 5 Close the Diagnostics Channel and disconnect the HHT from the t...

Page 73: ...ency in single steps while the INCF DECF commands make larger jumps by adding a space and a number to the command For example INCF_8 to increase the frequency by eight steps out of 100 When finished type RMST to store the setting Data Deviation 1 Adjust the service monitor to read modulation deviation With the transmitter still keyed SW1 Closed the deviation should be 2 5 kHz 100 Hz If not adjust ...

Page 74: ... just beyond that where the noise disappears Watch the scope for a few seconds and if necessary continue to advance R41 until the receiver remains fully squelched the noise no longer appears intermittently R3 SPACE TONE 2200 HZ FREQUENCY R2 MARK TONE 1200 HZ FREQUENCY R25 RECEIVE DATA DETECTOR THRESHOLD ADJUST J6 J8 R33 R33 RX TEST POINT Figure 4 4 1200 bps AFSK Modem MDS P N 03 1815AXX See Table ...

Page 75: ... list of the settings of configuration switch S1 on the modem they will be changed temporarily during the alignment procedure 2 Close the Diagnostics Channel and disconnect the HHT 3 Connect the Data Terminal Emulator to the INTERFACE connector 4 Connect the transceiver s ANTENNA connector to the input of the service monitor using a short length of RG 8 U or RG 214 coaxial cable Set up the service...

Page 76: ...s Note There is some interaction between R168 and the TX Frequency adjustment on the TCXO If the shift is equal in both directions but exceeds 1 6 kHz it may be necessary to turn the deviation down slightly and repeat this step Continue to alternately adjust R168 and the TX Frequency adjustment on the TCXO until equal 1 6 kHz shifts are obtained 3 Set RTS and TXD low SW1 and SW2 Open 4 Set S1 3 on...

Page 77: ...ables providing strain relief if necessary and check connectors for tightness This completes the set up of the transceiver with a 4800 baud modem installed For additional information on the 4800 baud modem refer to Appendix B TEST PROCEDURE TRANSMIT FREQUENCY SQUELCH DEVIATION AND RECEIVE AUDIO OUTPUT For Units with MDS s Internal 9600 BPS Modem In the following procedures references to SW1 SW2 re...

Page 78: ...W2 Closed This should cause the transmitted frequency to shift by 1 6 kHz 75 Hz either up or down It does not matter if the frequency shifts up or down the way it shifts depends only upon the phase of the modem s internal 9600 Hz clock at the instant the TXD line changed If the TXD line is toggled the transmit frequency should change between the assigned center frequency when TXD is low and 1 6 kH...

Page 79: ...c If not adjust the Receive Audio Level control R25 on the transceiver s motherboard to produce 0 7 to 0 75 Vp p at TP1 Squelch Adjustment 1 Using an oscilloscope set for DC coupling and 2 V or 5 V per division observe the Receiver Unsquelched RUS signal at Pin 10 of the INTERFACE connector 2 Insert an on channel signal at 120 dBm 225 µV with a 1 kHz tone and 2 5 kHz deviation Adjust R41 Squelch T...

Page 80: ...d Held Terminal and enter the STAT command The display responds with the type of diagnostics that are installed in the transceiver The forth character will show an I if the module is installed or a U if it is not installed See Table 3 2 to interpret the full response R6 LOOPBACK TX AUDIO LEVEL J7 J5 R33 TEMP SET Figure 4 7 Remote Maintenance Module P N 03 1958A01 NOTE In a properly aligned system ...

Page 81: ...ns of the three operating modes MODE_3xxxx is used to invoke Remote Maintenance the highest level of diagnostics Since it provides the highest level of diagnostics and control many users prefer to keep the radio set up for Remote Maintenance Diagnostics Deviation Adjustment 1 Loosen the four cover screws and remove the top cover from the transceiver by lifting straight up 2 Connect the transceiver...

Page 82: ...ne radio to another two diagnostic measurements need calibration for maximum accuracy These are the forward power FPWR and received signal strength RSSI functions Procedure 1 Connect a 50 Ω dummy load through a directional wattmeter to the ANTENNA connector of the transceiver 2 Connect the HHT to the INTERFACE connector of the transceiver 3 Key the transmitter with the KEY command from the HHT Typ...

Page 83: ...and Control System software on the PC and open the Diagnostics Channel to the Master Station 5 Using the software s Equipment List Editor select the Remote transceiver to be tested and set the radio s diagnostic level to Remote Maintenance 6 Return to the polling screen and verify that you can perform a diagnostic poll on the remote radio 7 Press F4 to invoke Remote Maintenance The Remote Maintena...

Page 84: ... POWER W REF FWD VSWR 0 3 4 8 OK MASTER MONITORING OF 6 0 4 0 2 0 0 2 0 4 0 6 0 50 60 70 80 90 100 110 6 0 5 0 4 0 3 0 2 0 1 0 0 SIGNAL STRENGTH 59dBm FREQ OFFSET 0 3KHz DATA DEVIATION 2 6KHz STATUS REMOTE UNIT TEMPERATURE 25 0 C POWER 56 FREQ 40 DATA DEV 65 REMOTE CONTROL SETTINGS AFC is currently set to OFF F6 AFC Off F7 Rx AFC F8 Tx Rx AFC F3 Toggle DTMF DATA Deviation Display F2 Update Screen ...

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Page 86: ...USE R41 SQUELCH THRESHOLD R69 TX POWER OUTPUT TX FREQ C247 VCO RANGE THRU SIDE OF SHIELD J4 ANTENNA OPTION BOARD 1 J6 J8 J8 J7 J5 R179 HF AUDIO COMP INV Z1 Z2 R168 TX DEV J11 SHUNT AS REQUIRED RS 232 DISABLE LED ENABLE J16 FULL DUPLEX INTERFACE 3 4 1 2 NORM L25 L8 T1 Figure 4 9 MDS 4310 Transceiver 2314Axx PC Board Test Points and Adjustments Potentiometer types may differ from those shown ...

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Page 88: ...tains the low IF amplifier and other functions LOW IF U32 contains several circuit sections mixer oscillator IF amplifier limiter quadrature detec tor and received signal strength indication driver The second 44 55 MHz LO for U32 is derived from the TCXO A frequency tripling circuit multiplies the 14 85 MHz TCXO signal and triples it up to 44 55 MHz This is consequently mixed with the 45 MHz IF to...

Page 89: ...to J2 From J2 the 13V is conducted to the internal transceiver circuits through F1 a 4 ampere fuse The fuse protects the transceiver in the event the external in line fuse is either defeated or replaced with one of a higher rating Z4 is a EMI power line filter C77 is a electrolytic capacitor These two devices help provide a noise free power source for the transceiver circuits A 17 volt zener diode...

Page 90: ...gh the inductor DIRECTIONAL COUPLER The directional coupler is used during diagnostic measurements of forward and reflected power at the ANTENNA connector The directional coupler consists of an in line transmission line section that conducts RF energy from power amplifier U33 to the antenna switch Coupled line sections located immediately adjacent to and either side of the transmission line receiv...

Page 91: ...from J1 to modulate the transmitter and cuts off any audio coming from the modem MICROCONTROLLER EEPROM The microcontroller U16 controls many of the on board functions of the transceiver Some of the control functions are Frequency Programming and Control of the Synthesizer Modem RTS CTS Delay Transmitter Time out Timer Transmit Soft Carrier Dekey Delay Transmit Squelch Tail Eliminator Delay Loopba...

Page 92: ...sation control This control provides a balanced transmit audio frequency response PLL SYNTHESIZER The temperature compensated 14 85 MHz crystal oscillator TCXO generates the reference frequency for the phase lock loop PLL circuit U36 is a CMOS PLL synthesizer consisting of a phase detector a programmable reference divider a programmable feedback divider and prescaler Data input is serially loaded ...

Page 93: ... to be selected When the pins 1 and 2 of J11 are connected together U31 is disabled This effectively removes U31 from the circuit LED INDICATORS U29 and U5 drive the LEDs U29 is a non inverting buffer A jumper across J11 pins 3 and 4 is required to enable the LEDs PWR This LED CR31B is illuminated if more than 10 volts is applied to the radio It flashes if the VCO is Out of Lock U5B is a flasher c...

Page 94: ...2 5V REF R168 TRANSMIT DEV ADJ U28C U28B LP FILTER LOOPBACK TX AUDIO U28D 14 85 MHz TCXO U1 3 LOW VOLTAGE RESET 5V U5C 2 5 VDC U3 8 U4 J4 Q1 9 U18 T1 DISCRIMINATOR VCO SAMPLE 14 85 MHZ REF 45 MHZ ANTENNA SWITCH FREQ TRIPLER 44 55 MHZ Y1 3 6864 MHZ BIAS J 2 13 5 V IN Q3 U44 A R69 POWER ADJUS T F1 4A Z 4 C7 7 5 VDC 8 VDC TX RX U19 F U19 A MODEM ENABLE J6 18 PTT J1 14 U15Z U26 B MODEM TX AUDIO TX AUD...

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Page 96: ... fuse c Check for continuity of plug in fuse F1 4A Fast Blo on the transceiver motherboard If it is blown check for reverse polarity or excessive voltage on primary power leads When the problem has been corrected replace the fuse 2 Antenna System Evaluation a Check antenna feedline and connections VSWR should be no higher than 1 5 1 Higher VSWR values usually will not prevent the radio from functi...

Page 97: ...signal 2 Interface Functions With Diagnostics Board Installed a Check power supply voltage SV b Check 8 volt regulator VR c Check PLL VCO lock voltage LV d Check RSSI voltage RSSI e Check power output KEY FPWR f Check programmed transmit and receive frequencies FRQ UNIT RECEIVES AND TRANSMITS BUT SYSTEM PERFORMANCE IS POOR 1 Transmitter Evaluation a Check transmit carrier frequency with a service ...

Page 98: ... is lost at beginning or end of transmission If lost at beginning suspect problem with RTU keyline interface if at end squelch tail or soft carrier dekey timing problems d If soft carrier dekey is needed check for proper programming of delay with HHT or PC terminal e If noise from the squelch tail closing is interfering with the data flow then enable the Squelch Tail Eliminator function in the MDS...

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Page 100: ...d bps data rate It will track input data rates as low 50 bps With this option mounted within the transceiver enclosure the MDS 4310 Transceiver can still be pro grammed through the RS 232 connector without the need to remove the housing cover J8 J6 Figure A 1 1200 bps Modem PC Board SPECIFICATIONS Current Drain 20 mA from the primary power source Tone Frequencies Mark 1200 Hz adjustable Space 2200...

Page 101: ...p PLL FSK demodulator Frequency shifted audio from the radio receiver is applied at Pin 2 which is one input of a phase detector The other input to the phase detector is the internal voltage controlled oscillator VCO the frequency of which is determined by C29 and R25 An error voltage is developed by the phase detector when the incoming audio signal frequency differs from the VCO frequency This er...

Page 102: ...3 MODEM RUS R2 MARK ADJ R3 SPACE ADJ RX AUDIO IN U4B LOW PASS FILTER DATA DEMODULATOR U6 DCD GATE R25 THRESHOLD ADJ C29 U6B TXD RXD DCD MODEM PTT RTS 5 V REGULATOR 10V 10 V REGULATOR 13V IN RE U7 U8 5V U5 U3 On Board Voltage Regulator Power Control Figure A 2 Bell 202T Compatible Modem Block Diagram ...

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Page 104: ...he modem contains an eight section set up and test switch S1 which is used to configure the modem for operation in a number of installation arrangements Table B 1 describes the function and recommended setting of each of these eight switch sections ALIGNMENT There is no alignment of the MDS 4800 bps modem required However should the modem be added to a radio that previously did not have a modem or...

Page 105: ... If the TXD line is tied high continuous Space the frequency will be 1 6 kHz above the nominal center While continuous data is being sent the frequency measures approximately the nominal channel frequency as the carrier toggles back and forth about the center frequency For a TTL interface configuration a Mark is a digital high or binary 1 and the Space is a digital low or a binary 0 TC RC ETC U7 R...

Page 106: ...board Received data is then delivered on the transceiver s INTERFACE connector Pin 3 Synchronizing Data For asynchronous operation the modem synchronizes to the incoming transmit data For synchronous operation the modem generates the transmit clock timing signal for use by external equipment Data changes on the rising edge of the TX clock signal and the modem samples the data on the falling edge o...

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Page 108: ... to configure the modem for operation in a number of installation arrangements Table C 1 describes the function and recommended setting of each of these eight switch sections ALIGNMENT There is no alignment of the MDS 9600 bps modem required However should the modem be added to a radio that previously did not have a modem or a defective modem is replaced with a new one it is advisable to check the...

Page 109: ...first mark to space transition correctly once a signal is received When an RF carrier is detected the receiver squelch forces DCD true high and the receiver receives the FSK Frequency Shift Keyed signal just as it would any FM signal The recovered audio is fed to the modem board A sample of the detected receive audio is held by U3A after it passes through a low pass filter U3B C This sampling take...

Page 110: ...NC ASYNC CONVERTOR PROM U5 U4 5 V REGULATOR 10V 10 V REGULATOR 13V IN RE U7 U8 5V U3D U3C U3B DATA PROCESSOR MODEM RX AUDIO U6 RUS LOW PASS FILTER U8 DATA SLICER TC RC ETC U7 RS 232 INTERFACE TX AUDIO OUT RXD TXD PTT TAE DCD U3A SAMPLE AMP U9 SAMPLE SWITCH POWER REGULATORS CONTROL Figure C 1 MDS 9600 bps Modem Block Diagram P8 P6 S1 CONFIGURATION 8 1 U6 U5 OPEN CLOSED Figure C 2 9600 bps Modem Ass...

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Page 112: ...Master Station become unavailable for data exchange when Remote Maintenance commands are invoked on any transceiver in the radio system Use of Remote Maintenance commands then should occur at times that are as non disruptive as possible and any affected users should be notified in advance The Remote Maintenance Module mounts within the housing of the MDS 4310 Transceiver Specifically the board mat...

Page 113: ...TMENTS CALIBRATION The Remote Maintenance Module contains two adjustable controls Loopback TX Audio Level R6 and Temperature Setting R33 Normally R6 needs adjustment only when the module is first installed in the radio R33 is adjusted at the factory Refer to Chapter 4 Field Tests and Adjustments Test Procedure for alignment instructions NOTE In a properly aligned system Remote Maintenance provides...

Page 114: ...Chapter 4 Field Tests and Alignments Test for instructions on setting the loopback code and for adjusting the diag nostics deviation Physical Installation Removal The following procedures summarize the removal and replacement of a Remote Maintenance Module To remove the module 1 Disconnect primary power to the unit and remove the transceiver s top cover 2 With a slight rocking motion remove the mo...

Page 115: ...the Remote Maintenance Module A properly decoded Loopback Code will key the radio and generate a series of DTMF signals and a short but steady tone that is used by the master station for frequency and deviation measurements This basic response can be monitored on a communications service monitor Make sure to connect the ANTENNA jack of the transceiver to the transmit input of the service monitor b...

Page 116: ...ain circuit board The setting is controlled by the firmware through the diagnostics channel both locally and remotely Radio Center Frequency Control U9 is a 100 position 100k EEPOT that controls the radio carrier frequency U9 is configured as a ratiometric resistor that sources a voltage to control the carrier frequency The voltage being sourced by the EEPOT is controlled by the micro controller o...

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Page 118: ...ommunications on the channel Receiver audio from the transceiver can be monitored by using the earpiece on the handset Speaking into the handset microphone activates the VOX circuit in the adapter allowing voice communications with the master or base station As a convenience the Order Wire Module has been designed to work with a standard four wire modular RJ 11 4 telephone handset available from a...

Page 119: ...rcuit built into the adapter When the limiter is driven into limiting audio is present at U1 Pin 2 CR1 detects this audio with C5 and R12 providing a VOX delay As long as the microphone audio is below clipping level U1 Pin 2 remains a virtual ground and PTT remains low U1D amplifies the received audio with R18 setting the volume R13 couples some of the TX audio into this amplifier to provide sidet...

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Page 122: ...able as a stand alone unit for use in the hazardous locations described above It must either be mounted within another piece of equipment which is certified for hazardous locations or installed within guidelines or conditions of approval as set forth by the approving agencies These conditions of approval are as follows 1 The transceiver must be mounted within a separate enclosure which is suitable...

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Page 124: ...cing 25 kHz Power Output 1 to 5 watts continuously variable RSS 122 Frequency Range Transmit 406 1 430 MHz Receive 406 1 430 MHz Channel Spacing 12 5 kHz Power Output 1 to 5 watts continuously variable RESTRICTIONS The Industry Canada approval is valid subject to the restrictions listed below 1 The MDS 4310 may only be used with a built in modem at speeds of either 1200 4800 or 9600 bps No externa...

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Page 126: ... of switches to configure the assembly for a variety of interface requirements The assemblies consist several circuits a VOX circuit discussed above a transmit audio pre emphasis circuit receive audio de emphasis circuit and limiter circuitry These circuits may be turned on and off independently using the configuration switches The automatic level control ALC circuitry is continuously enabled and ...

Page 127: ...HT For more information on using the HHT see Chapter 3 Programming and Diagnostics especially the section Programming Examples and Table 3 2 Table J 1 lists the configuration switch settings for the MDS P N 03 2301A01 Figure J 2 shows the component layout for the PC board C31 U3 R22 C15 R38 P8 C26 C12 R19 C29 CR2 CR1 R13 C27 MICROWAVE DATA SYSTEMS R12 C30 C23 U2 C17 R41 C6 R6 VOX 4000 PCB C24 C20 ...

Page 128: ...actory is best equipped to diagnose repair and align your radio to its proper operating specifications If return of the equipment is necessary you will be issued a Returned Material Authorization RMA number The RMA number will help expedite the repair so that the equipment can be repaired and returned to you as quickly as possible Please be sure to include the RMA number on the outside of the ship...

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