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Operation

SFC4200/SFC1275G Synthesized Frequency Downconverter

3-6

TM054 - Rev. 4.0

As shown in Figure 3-2, the phase noise plots showing synthesized and IF LO SSB Phase Noise
are representative of the actual phase noise of the SFC4200.

Figure 3-2. Phase Noise Plots

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Summary of Contents for SFC4200

Page 1: ... ComStream Corporation This manual may not in whole or in part be copied reproduced translated or reduced to any electronic or magnetic storage medium without the written consent of a duly authorized officer of Radyne ComStream Corporation Radyne ComStream Corporation 3138 E Elwood St Phoenix AZ 85034 602 437 9620 Fax 602 437 4811 ...

Page 2: ......

Page 3: ...o different sized packets The remote M C MUST make use of the non volatile count value to index to the start of the Volatile Section If the remote M C is not aware of the newly added features to the product it should disregard the parameters at the end of the Non Volatile Section and index to the start of the Volatile Section Before creating any software based on the information contained in this ...

Page 4: ...Warranty Policy DM240 Synthesized Frequency Downconverter 2 ...

Page 5: ...e and or malfunction relating in any way to shipping storage accident abuse alteration misuse neglect failure to use products under normal operating conditions failure to use products according to any operating instructions provided by Radyne ComStream Corporation lack of routine care and maintenance as indicated in any operating maintenance instructions or failure to use or take any proper precau...

Page 6: ...cility or if field repair will be accomplished The Repair Authorization may be requested in writing or by calling Radyne ComStream Corporation 3138 E Elwood St Phoenix Arizona 85034 USA ATTN Customer Support Phone 602 437 9620 Fax 602 437 4811 Any product returned to Radyne ComStream Corporation for examination must be sent prepaid via the means of transportation indicated as acceptable to Radyne ...

Page 7: ... Corporation makes no commitment to update nor to keep current the information contained in this document Radyne ComStream Corporation assumes no responsibility for use of any circuitry other than the circuitry employed in Radyne ComStream Corporation systems and equipment Revision Level Date Reason for Change 1 0 7 15 96 Initial Release 2 0 12 01 96 Added interconnection diagram redefined connect...

Page 8: ...SFC4200 SFC1275G Synthesized Frequency Downconverter vi TM054 Rev 4 0 This Page is Intentionally Left Blank ...

Page 9: ...1 3 1 Signal RF Assembly ______________________________________________3 1 3 1 1 AS 4010 Converter First Mixer C Band Downconverter SFC4200 _________3 2 3 1 2 AS 4011 Converter Second Mixer C Band Downconverter SFC4200 ______3 2 3 1 3 AS 4007 Converter First Mixer Ku Band Downconverter SFC1275G _______3 3 3 1 4 AS 4012 Converter Second Mixer Ku Band Downconverter SFC1275G ____3 3 3 2 AS 3048 M C C...

Page 10: ...__4 11 4 2 4 Converter Faults Menu __________________________________________4 12 4 2 5 Utility Access Menus____________________________________________4 13 4 2 6 Switch Configuration Menu_______________________________________4 14 4 2 7 Learn Menu Backup Converter Only ______________________________4 14 4 2 8 Learn Status Menus Backup Converter Only ________________________4 14 4 2 9 Configuratio...

Page 11: ...nverter Operator Quick Reference Guide ___________________4 25 Section 5 Electrical Interfaces 5 0 SFC Downconverter Connections ____________________________________5 1 5 1 Power _________________________________________________________5 1 5 2 RF In J1 _______________________________________________________5 1 5 3 IF Out J2 ______________________________________________________5 1 5 4 10 MHz Ref O...

Page 12: ...________7 1 7 2 Output Characteristics _____________________________________________7 1 7 3 Transfer Characteristics____________________________________________7 1 7 4 Frequency Synthesizer ____________________________________________7 2 7 5 Single Side Band Phase Noise ______________________________________7 2 7 6 Rx Signal Strength Detection________________________________________7 2 7 7 Mechani...

Page 13: ...nt Panel Controls or remotely via an RS 232 Serial Interface The units monitor local oscillator LO phase locked loop faults in the converter at all times during operation If a fault is detected the converter immediately goes into the Off Line Mode If multiple converters are configured to provide backup protection switching a summary fault will signal the backup and put itself online thus restoring...

Page 14: ...plug and play ease of installation with the RCU101 1 1 or the RCU108 1 8 Redundancy Control Units All converters can be plugged into the backup slot and assume the role of protection switch controller The backup converter learns and stores the frequency gain and channel settings of the primary converters If the stored setting of the primary converter is changed the backup converter will notify the...

Page 15: ...Installation and Operation Manual 2 2 Removal and Assembly Carefully unpack the unit and ensure that all of the above items are in the carton If the Prime AC power available at the installation site requires a different power cord AC connector then arrangements to receive the proper device will be necessary before proceeding with the installation SFC Downconverters are shipped fully assembled and ...

Page 16: ...ncy Downconverter 2 2 TM054 Rev 4 0 2 5 SFC Downconverter Interconnections Figure 2 1 illustrates a typical interconnection of a SFC Downconverter with an RCU101 1 1 Protection Switch Figure 2 1 RCU101 Typical Interconnection with SFC Downconverters ...

Page 17: ...stent The SFC Downconverters are double conversion microwave Downconverters The block diagram Figure 3 1 of the system includes the Signal RF Assembly the Synthesizer Assembly the Reference Assembly the Monitor and Control M C Microcontroller and Power Supply Subsystem Figure 3 1 SFC Downconverter Block Diagram 3 1 Signal RF Assembly The Signal RF Assembly is a subassembly that holds the first and...

Page 18: ...nce 50Ù 50Ù LO Input 4 6625 5 2425 GHz 13 dBm for 70 MHz IF 4 5925 5 1725 GHz 13 dBm for 140 MHz IF 4 555 5 355 GHz 13 dBm for 70 MHz IF 4 485 5 285 GHz 13 dBm for 140 MHz IF 3 1 2 AS 4011 Converter Second Mixer C Band Downconverter SFC4200 The Second Mixer module of the C Band Downconverter accepts the IF from the First Mixer and converts and amplifies it to the 70 140 MHz 75Ù IF Output The Secon...

Page 19: ...070 GHz 70 MHz 2 100 2 180 GHz 140 MHz Pout Nominal 34 to 35 dBm Output Impedance 50Ù LO Input 8 88 10 68 GHz 13 dBm for 70 MHz IF 8 81 10 61 GHz 13 dBm for 140 MHz IF 3 1 4 AS 4012 Converter Second Mixer Ku Band Downconverter SFC1275G The Second Mixer module of the Ku Band Downconverter accepts the IF from the First Mixer and converts and amplifies it to the 70 MHz 75Ù IF Output The Second Mixer ...

Page 20: ...s an output voltage of 0 3 V 8 50 V respectively The 8 channel A D Converter allows the AS 3048 to monitor various voltages within the converter The input to the A D is 0 to 5 VDC Voltages monitored by the A D include the square law voltages from the IF and Fault of the synthesizer which allows the controller to calculate signal strengths The Equipment RS 485 UART is independent from the Operator ...

Page 21: ...z 88 dBc 10 kHz 95 dBc 100 kHz 110 dBc 1 MHz 70 dBc 100 Hz 80 dBc 1 kHz 88 dBc 10 kHz 95 dBc 100 kHz 110 dBc 1 MHz IF LO Output Frequency 1112 5 MHz 1 225 GHz Spurious 70 dBc 70 dBc Harmonics 20 dBc 20 dBc 3 3 2 Synthesizer Module SFC1275G The 10 MHz reference to the synthesizer is provided by the AS 3072 Reference Assembly Performance of the synthesizer is listed in Table 3 6 Table 3 6 Synthesize...

Page 22: ...nthesized Frequency Downconverter 3 6 TM054 Rev 4 0 As shown in Figure 3 2 the phase noise plots showing synthesized and IF LO SSB Phase Noise are representative of the actual phase noise of the SFC4200 Figure 3 2 Phase Noise Plots ...

Page 23: ...plied 10 MHz becomes available at the RF Output Port where it can be supplied to the Reference Input of the next converter Int 10 MHz 10 MHz signal for the synthesizer Analog Digital Signal to the reference assembly includes the following Synthesizer Interface 16 Pin Synthesizer Bus provides control of serial DAC for the purpose of fine tuning the 10 MHz Frequency Reference Power Connector 10 Pin ...

Page 24: ...equency may drift as much as 6x10 E 9 To correct an error in frequency the operator should use the Reference Menu and adjust the Frequency Offset in PPB Scaling of the PPB Offset allows for 999 PPB of adjustment An increment of 1 PPB of the Reference Menu Offset will provide approximately 4 6 Hz correction in the synthesizer frequency 3 7 Amplitude Accuracy The frequency response stability of the ...

Page 25: ... described in Table 4 1 Figure 4 1 SFC Downconverters Front Panel Controls and Indicators Table 4 1 Front Panel User Interface Item No Description Function 1 Front Panel LED Indicators Refer to Section 4 1 1 for an itemized description of these LEDs 2 Front Panel LCD Display Displays SFC Downconverter operating parameters and configuration data 3 Front Panel Keypad Controls the up down left and ri...

Page 26: ...et SIG FAULT Yellow Signal Faults are used in switch configuration to indicate switch status when in the Backup Mode 4 1 2 Front Panel LCD Display The front panel display is a 2 line by 24 character LCD display that is capable of displaying five fields of information in each menu window While at the Root Menu the Front Panel LCD Display displays five fields which are depicted by text captions arou...

Page 27: ... the converter is the backup converter in a redundancy system either a 1 1 or a 1 8 system Primary Indicates that the converter is the primary converter in a redundancy system either a 1 1 or a 1 8 system Note The online menus indicate no faults Other Menus Setup Allows the user to modify the fields from the Front Panel Display To accomplish this 1 Press Enter to obtain the cursor 2 Move the curso...

Page 28: ...eration to control frequency gain and status will be covered in detail below ENTER The Enter Key will cause changes to Frequency Status and other operator selected parameters to be executed Enter also causes the status of the converter to be saved into non volatile memory MENU The Menu Key toggles the screens of the Front Panel LCD Display through the various menus refer to Section 4 2 4 1 3 1 Sof...

Page 29: ...y Unit Configuration Menu Allows operator selection of unit address 1 99 serial port baud rate 1200 2400 4800 and 9600 baud Echo On Off specifies converter configuration Single 1 1 or 1 8 and indicates backup primary configuration Reference Menu This menu allows the operator to adjust the reference source in PPB and to view the number of hours the converter has been in operation Output Attenuator ...

Page 30: ...C4200 SFC1275G Synthesized Frequency Downconverter 4 6 TM054 Rev 4 0 Figure 4 2 Prime and Single SFC Downconverter Front Panel Menu Flowchart SFC Downconverter Menu Flow Charts Prime and Single Backup 1 1 and Backup 1 8 ...

Page 31: ...SFC4200 SFC1275G Synthesized Frequency Downconverter User Interfaces TM054 Rev 4 0 4 7 Figure 4 3 Backup 1 1 SFC Downconverter Front Panel Menu Flowchart ...

Page 32: ...v 4 0 Figure 4 4 Backup 1 8 SFC Downconverter Front Panel Menu Flowchart 4 2 1 Root Menu The Root Menu appears after the Model Identification Screen after power up of the converter The four fields of this menu include Receive Frequency Status Gain Receive Signal refer to Figure 4 5 ...

Page 33: ...f the Status prompt is as follows Status Channel No SINGLE Indicates that the converter is in a standalone configuration and that when presented with an input signal of the specified frequency will generate an output signal with the specified conversion gain PRIMARY Indicates that the converter is in a switched configuration and that when presented with an input signal of the specified frequency i...

Page 34: ...will be stored to memory and the cursor will be placed in the Status Field Use the or Keys to select the online indicator and depress ENTER The new converter settings will be executed the RF will be turned back On and the front panel will be locked Note The Backup Converter Learns about the Prime s and therefore cannot be placed in Setup Mode An optional method of changing the Frequency and Gain i...

Page 35: ... be changed in the Gain field and increment or decrement the number using the or Keys The Gain change will be made at this time To store the new Gain into the non volatile memory for the currently selected channel number depress ENTER An asterisk will be displayed to the right hand corner of the Channel Field to indicate a Channel Store operation has taken place Otherwise upon power up or recallin...

Page 36: ... Relay did not switch when told to do so Note Any Switch Fault will cause the Signal Fault LED on the Backup to illuminate It will also cause the Error LED on the 1 8 Switch to illuminate 4 2 4 Converter Faults Menu To access the Converter Faults Menu depress ENTER If there are no stored faults the fault menu will indicate Stored Faults None If there are stored faults the menu will indicate that s...

Page 37: ...ain will scroll to the second Configuration Menu Use MENU to scroll through the Reference Menu Status Menu and Output Attenuator Calibration Menu Calibration Menus represent those alignments settings and various operating parameters that are set in non volatile memory Most calibration is done via the RS 232 Interface but those same parameters can be accessed via calibration menus Note The Calibrat...

Page 38: ...er s priority When all of the priorities have been set pressing the ENTER causes the Backup to accept the entries and store them in Non Volatile RAM Pressing MENU will scroll to the next menu 4 2 7 Learn Menu Backup Converter Only Depressing MENU will scroll to the Configuration Menu Depressing ENTER will cause the Backup Converter to Learn about the Primary Converter Figure 4 13 Figure 4 13 Learn...

Page 39: ...r The Backup Converter is not capable of backing up the Prime Converter 4 2 9 Configuration Menu The ID Field allows the operator to establish an ID Number for the Operator Serial Interface Move the cursor to this field and increment or decrement to change the ID Number Press ENTER to store the value The field for Baud Rate allows the operator to select baud rates from 1200 to 9600 bps Move the cu...

Page 40: ... over a range of 999 PPB This menu also contains a clock that indicates the total number of hours the unit has been in operation since the reference oscillator was first installed The Reference Menu is as follows Figure 4 18 Reference Menu OPPB This field contains the offset of the 10 MHz frequency standard in PPB When the oscillator is first installed or when the oscillator has been coarse calibr...

Page 41: ... panel as follows C Band Downconverter 70 MHz IF LO MON Rx Freq 1042 5 MHz C Band Downconverter 140 MHz IF LO MON Rx Freq 972 5 MHz C Band Downconverter Extended 70 MHz IF LO MON Rx Freq 1155 MHz C Band Downconverter Extended 140 MHz IF LO MON Rx Freq 1085 MHz Ku Band Downconverter 70 MHz IF LO MON Rx Freq 2070 0 MHz Ku Band Downconverter 140 MHz IF LO MON Rx Freq 2140 0 MHz The RF Monitor output ...

Page 42: ...t for more than a week allow several days of operation before verifying the accuracy For this reason converters shipped from Radyne ComStream Corporation are typically powered up until the final day before shipment In addition the accuracy and aging rate are verified immediately prior to shipment For a converter that has been powered up for several months the operator can assume an aging rate of s...

Page 43: ...ed by the spectrum analyzer Finally the correct DAC is stored by depressing ENTER The attenuator setting is incremented to the next location or in this case 01 dB The process is repeated until 20 dB is reached and then the next frequency is selected The frequency of the signal generator must be changed and the process repeated This menu is not displayed when the converter is online 4 3 Serial Prot...

Page 44: ... B1 8 Backup Converter 1 8 Switch ALL All Converters 4 5 1 Set Current Channel Frequency Command S P1 1 P1 8 The Set Current Channel Frequency Command alters the stored frequency of the current channel The set frequency command is as follows 01 SETFREQffff t cr The frequency numerical values include four digits for MHz and one digit t which indicates the resolution in 125 kHz steps The values of t...

Page 45: ...for the remote operator by entering the Help command as follows 01 HELP cr 4 5 6 Status Command Prior to issuing a remote command the remote operator may first wish to determine the current status of the converter To request status issue the following command 01 STATUS cr A single converter will issue the following string of information Configuration Single Status Online Faulted Setup Channel Curr...

Page 46: ... Text Signal Value Stored Faults None or Faulted One For Eight Switch Status Indicates the status of each prime converter Switch is in Manual Mode Auto Mode Prime 1 Prime 2 Prime 3 Prime 3 Prime 4 Prime 5 Prime 6 Prime 7 Prime 8 Backup is Available Online for Converter 1 8 Notes If none of the converters are faulted the Hot Converter will be the converter for which the backup is in hot standby If ...

Page 47: ...end a manual command to the converter that is Manually Deselected i e the one that is NOT selected Then send an Auto Command to the same converter and the switch change back to Auto Mode 4 5 10 Manual Backup Command B1 8 This command allows the operator to force the switch to put the Backup online for the specified converter and keeps it there This command simulates the manual backup selection swi...

Page 48: ...t have a priority 0 As the Backup converter polls the Prime s the learning status will be output via the serial port 01 LEARN 4 5 17 Show Priority B1 8 This command causes the backup converter to display the priority settings for all 8 of the prime converters 01 SHOW PRI 1 8 configuration only 4 5 18 Set Priority B1 8 This command is used to set the priorities of converters 1 to 8 respectively whe...

Page 49: ...01 SETCHAN Sets the current channel 01 SETFREQ Sets the frequency for the current channel 01 STORE Saves all data under the current channel 01 RAMGAIN Sets the gain for another alternate channel 01 SETATTN Sets the input attenuator for the current channel 01 RAMFREQ Sets the frequency for another alternate channel 01 AUTO Puts the switch back into Auto Mode Simulates the middle position of the fro...

Page 50: ......

Page 51: ...nverters It is an N Type Female Connector for the SFC4200 and an SMA Female Connector for the SFC1275G 5 3 IF Out J2 The IF Out Connector J2 is the 75 Ohm BNC F Connector Outputs are within 50 90 MHz for standard units and 100 180 MHz for units equipped with 140 MHz 5 4 10 MHz Ref Out J3 The 10 MHz Reference Out J3 is the 50 Ohm BNC F Connector that provides a 10 MHz squarewave 50 Ohm AC coupled r...

Page 52: ...B1 Fault Code Bit 1 11 10 FCB2 Fault Code Bit 2 4 14 FCB3 Fault Code Bit 3 12 3 FCB4 Fault Code Bit 4 5 7 IDB1 ID Bit 1 13 11 IDB2 ID Bit 2 6 15 IDB3 ID Bit 3 14 4 IDB4 ID Bit 4 7 8 INT O Interrupt 15 12 RMT 8 5 7 Equipment RS 485 J6 The Equipment Multi Drop Full Duplex Bi directional RS 485 Interface J6 allows communication between converters Because the RS 485 Interface uses a master slave talke...

Page 53: ...ed in determining fault status by the microprocessor are made directly available to the rear panel of the converter Synthesizer and signal path faults can be verified with a voltmeter using the following test points The pinouts of this connector are listed in Table 5 3 Table 5 3 J7 Test Fault Interface D Sub 15 Pin Connector Pin No Signal Description Controller AS 3048 J5 A D Chan 1 N C 1 2 LOFLT ...

Page 54: ...ion on the AS 3048 Controller PWB must have been performed as illustrated in Figures 5 4 through 5 7 A summary of the jumper selections is as follows Configuration JP4 1 JP4 2 JP4 3 JP4 4 JP4 5 JP4 6 JP3 JP5 JP6 JP7 JP8 RS 232 OUT OUT OUT OUT IN IN OUT OUT IN OUT OUT RS 422 IN IN IN IN OUT OUT OUT OUT OUT OUT IN RS 485 IN IN IN IN OUT OUT OUT OUT OUT OUT IN RS 485 1 2 DPLX IN OUT OUT IN OUT OUT OU...

Page 55: ...be made by the operator to implement the RS 422 485 or multipoint RS 232 modes of serial operation The theory of operation for multipoint requires that the M C Computer Transmit Port be connected in parallel to all of the Receive Data Ports of the various converters Likewise the transmit ports of the various converters must all be connected in parallel and tied to the Receive Data Port of the M C ...

Page 56: ...Electrical Interfaces SFC4200 SFC1275G Synthesized Frequency Downconverter 5 6 TM054 Rev 4 0 Figure 5 3 RS 232 Operator Serial I O Configuration Figure 5 4 RS 422 Operator Serial I O Configuration ...

Page 57: ...onfigured for echo off in the Configuration Menu If the converters are being linked to a dumb terminal the echo should be turned on locally 5 10 Coarse VCXO Adjustment This adjustment at the rear panel is used to set the initial accuracy of the 10 MHz reference The coarse adjustment was factory set to 1 x 10 9 accuracy with the software offset set to 000 PPB Refer to Section 4 2 10 2 for the softw...

Page 58: ...will be 15 dB nominal below the level present at J2 5 11 3 LO Monitor The LO Monitor allows the operator to monitor the Synthesized or Second Mixer Local Oscillator using the SMA LO Monitor Connector at the front of the converter The power level of the signal measured will be 15 dBm nominal The frequency of the synthesizer LO in the SFC Downconverters can be determined by subtracting the IFLO Freq...

Page 59: ...SFC4200 SFC1275G Synthesized Frequency Downconverter Electrical Interfaces TM054 Rev 4 0 5 9 Figure 5 9 Phase Noise Plot ...

Page 60: ...Electrical Interfaces SFC4200 SFC1275G Synthesized Frequency Downconverter 5 10 TM054 Rev 4 0 This Page is Intentionally Left Blank ...

Page 61: ...operation Normal aging and drifting of electronic components can cause the accuracy of the converter to change over time As with any converter these changes will affect the frequency accuracy and frequency conversion amplitude accuracy over time 6 1 Failure Analysis Faults in the converter are limited in scope to either a LO Fault or a Signal Fault Other faults may or may not provide an indication...

Page 62: ...Maintenance SFC4200 SFC1275G Synthesized Frequency Downconverter 6 2 TM054 Rev 4 0 This Page is Intentionally Left Blank ...

Page 63: ... dBm Output 19 dBm Note Performance specifications guaranteed at nominal levels only Connector BNC Type F 7 3 Transfer Characteristics Type Double Conversion No Spectral Inversion Gain 40 dB Maximum 0 dB Total Attenuation Options to 60 dB Gain Control 40 dB 0 1 dB Increments 0 dB to 40 dB Conversion Gain SFC4200 Gain Ripple 0 25 dB 36 MHz Typical 0 50 dB 76 MHz SFC1275G Gain Ripple 0 50 dB 36 MHz ...

Page 64: ... kHz 80 dBc Hz 80 dBc Hz 10 kHz 88 dBc Hz 84 dBc Hz 100 kHz 95 dBc Hz 94 dBc Hz 1 MHz 110 dBc Hz 110 dBc Hz External Reference 5 MHz Optional 7 6 Rx Signal Strength Detection SFC4200 Sensitivity TSS 80 dBm 40 dB Gain Referenced to the RF Input Connector 40 dBm 0 dB Gain Referenced to the RF Input Connector SFC1275G Sensitivity TSS 80 dBm 40 dB Gain Referenced to the RF Input Connector 40 dBm 0 dB ...

Page 65: ...ator Serial Port D Sub 9 Pin 10 MHz REF In BNC REF Out BNC Fault Test D Sub 9 Pin Switch Interface D Sub15 Pin Equipment RS 485 Interface D Sub 9 Pin IEC 320 C13 Power Entry Module Module Switch 10 Ground Lug Front Panel Test Ports LO Monitor 15 dBm SMA F RF Monitor 15 dB SMA F IF Monitor 15 dB SMA F 7 9 Environmental Characteristics Temperature 0 to 50 C Humidity To 95 Non Condensing Altitude To ...

Page 66: ...Technical Specifications SFC4200 SFC1275G Synthesized Frequency Downconverter 7 4 TM054 Rev 4 0 This Page is Intentionally Left Blank ...

Page 67: ...SFC4200 SFC1275G Synthesized Frequency Downconverter Appendices TM054 Rev 4 0 8 1 This Page is Intentionally Left Blank ...

Page 68: ...Appendices SFC4200 SFC1275G Synthesized Frequency Downconverter 8 2 TM054 Rev 4 0 This Page is Intentionally Left Blank ...

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