Rohde&Schwarz XD950 technical description

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Page 1

1 110110 XD950 Transciever 50W

ROHDE &SCHWAR

ND 950 Base Station System

Maintenance & Faultfinding Training

2 310601 RX Front End

3 310002 RX IF

4 300603 RX Synthesizer

5 310604 TX Exiter

6 300605 20W Power Amplifier

7 300606 50W Power Amplifier

8 300407 Directional Coupler

9 300408 RF Testloop Switch

10 300009 Control Board

11 310010 Analogue Board

Vol. 2

The information in this document is subject to Change without notice. All rights reserved Part of the document may be reproduced or Transmitted in any form or by any means, Electronic or mechanical, for any purpose, Without written permission of Damm Cellular Systems A/S. Company or product names mentioned in this Document may be trademarks or registered Trademarks of the respective companies

Rev. 1.00 Date: 020731

. No

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Doc. No. Rev. Date

R110110_F01 1.00 02.06.04

Description

110110 TRANSCIEVER XD 950 50W

ND950/951

Base Station System

110110

XD950 Transceiver 50W

ND950training\manual\vol2\110110\R110110_F01 Page 1 of 1

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Doc. No. Rev. Date

R110110.IDX 1.00 02.06.04

Description

110110 TRANSCIEVER XD950 50W

110110 XD950 TRANSCEIVER 50W

INDEX :

Document Date Description

R110110-F01 970324 Front page R110110-IDX 970507 Index R110110-LST Parts list R210601-B01 970507 Block Diagram - Transciever R210601-B02 950929 Block Diagram - Power Distribution R210601-B03 970507 Block Diagram - Test Circuit R210601-LST Parts list XD950 990215 TR unit Functional Description XD950 990215 XD950 TR unit help 210601-ADJ 020604 Adjustment procedure XD950 R200401-A01 961204 Assembly drawing

ND950training\manual\vol2\110110\R110110_IDX Page 1 of 1

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Doc. No. Rev. Date

2002-06-28R110110-LST

Description

Parts list: XD950 410-420MHz 50W transceiver

110110 XD950 410-420MHz 50W transceiver

Pos. Description Item No. Qty Unit 1 210601 XD950 410-420MHz 50W transceiver 1 pcs. 2 560001 Coax cable TNC/RG223/TNC 160mm 1 pcs. 3 560002 Coax cable BNC/RG223/BNC 160mm 1 pcs.

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2001-09-25R210601-LST

Description

Parts list: XD950 410-420MHz 50W transceiver

210601 XD950 410-420MHz 50W transceiver

Pos. Description Item No. Qty Unit 1 300011 13-pol. connector module 1 pcs. 2 300012 23-pol. connector module 2 pcs. 3 300013 Termination 50 ohm 2-pin 2 pcs. 4 518001 R&S front plate for XD950 1 pcs. 5 530112 Cabinet+cover for 50W transceiver 1 pcs. 8 300017 Frequency reference cable 1 pcs. 9 562104 Power cable for transceiver 1 pcs. 10 800106 Handle for TR/SR 1 pcs. 11 800105 Thread nipple M2.5 steel 2 pcs. 15 810001 Insulator sleeve 3.5/3.1 1 pcs. 17 563002 Etronit plate 315x107x0.5 1 pcs. 19 810601 Cover plastic Ø12/16mm 1 pcs. 20 810703 Binding sleeve A2 1 pcs. 21 562004 Cable 6-pol. for front-end 1 pcs. 101 870404 Screw M2.5x5 CHJL Z 31 pcs. 102 870405 Screw M2.5x6 CHJL Z 2 pcs. 104 870407 Screw M2.5x10 CHJL Z 2 pcs. 105 870613 Screw M4x25 CHJL Z 6 pcs. 106 870590 Screw M3x6 flange head JU Z 2 pcs. 107 870504 Screw M3x6 CHJL Z 3 pcs. 108 873403 Screw M2.5x6 UHJX Z 8 pcs. 109 873601 Screw M4x6 UHJX Z 4 pcs. 110 877502 Screw M3x8 UHJU Z 2 pcs. 111 875675 Screw M4x6 LHRX 4 pcs. 113 800104 Screw M2.5 for front plate 2 pcs. 203 884001 RF gasket 3mm 1650 mm 900 517005 Label "Warning! R&S BASE STATION" 1 pcs. 901 517008 Label 40x32mm 1 pcs. M1 310601 RX front-end 410-420MHz R&S 1 pcs. M2 - Not used 0 pcs. M3 310002 RX IF board R&S 1 pcs. M4 300603 RX freq.synthesizer 410-420MHz 1 pcs. M5 310604 R&S Exciter 420-430MHz 1 pcs. M6 300605 20 W PA 400-440MHz 1 pcs. M7 300606 50 W PA 420-430MHz 1 pcs. M8 300407 Directional coupler 400-500MHz 1 pcs. M9 300408 RFTL switch 1 pcs. M10 300009 Control board 0 pcs. M11 310010 Analog board R&S 1 pcs.

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Description

XD950 TR unit help

TR Functional Description

TR FUNCTIONAL DESCRIPTION

All test commands for the base station transceiver consist of a 2-digit command in the range 00 to 99 with an optionally parameter. Commands without parameters are display-only commands and will not make any change in the TR. Therefore, it is possible to "page through" the commands to find the right one without any risk to change vital parameters.

The commands are divided into groups, covering the different functions in the TR. For example, all the TX commands are in the 10 to 19 group.

If the first two characters are not representing a valid number in the 00 to 99 range, an error message will be displayed:

INVALID TR COMMAND

This is however not the case if the first character is a + , which are reserved for commands to the test box, and for strings of the format !hhhhhh, which is used for transfer of alarms from the CCU to the TR. In these cases no response will be sent.

MSC/TSC/LOCAL CONTROL MODE

After power-on, the TR always starts in MSC/TSC-mode. If a given command requires local blocking, it is shown in the help for the command. Commands that requires local blocking is not available under MSC/TSC control, to protect the normal operation of the base station. If a protected command is called, the following response is displayed:

LOCAL BLOCKING NECESSARY

Only commands with a parameter are protected. After activation of local blocking (01+), all the commands are available.

PARAMETERS

Two types of parameters are used.

Generally + is used as parameter to turn on, enable or step up and - is used as parameter to turn off, disable or step down.

For more complex functions, a / is used as separator after the command no. followed by the necessary no. of characters for the actual function.

If the parameter is not valid for the actual command, the following response is displayed:

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

INVALID PARAMETER

SETTINGS

Many calibration and system parameters are stored residently in the micro- processors built-in EEPROM. At power-up and reset all settings are copied into the workspace RAM, from where the different software tasks takes the settings.

Any change in the settings is only made in the workspace RAM. To store the new setting residently, a programming command shall be made for the specific setting. This has a standard format for all settings (xx/EE++++). If the programming succeeded, the following response is displayed:

SETTING STORED IN EEPROM

If a failure during programming is detected, the following response is dis- played:

EEPROM PROGRAMMING ERROR

The programming command string has been made rather complex to limit the risk of accidential change of the resident settings. The resident settings are restored into the workspace RAM at software reset (02+) or local deblocking (01-) if local blocking was selected.

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

General commands

00 DISPLAY SOFTWARE VERSION NUMBER

00 Display software version number 00

Command description:

Response:

1) R&S 410 MHz BS VER. 1.20

Description: Displayes the software version number in the EPROM on the control board.

01 LOCAL BLOCKING/DEBLOCKING

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01 Local blocking: Display state 01

01+ Local blocking: Conditional request 01+

01++ Local blocking: Forced request 01++

01- Local blocking: Off 01-

Command description:

Response:

1) LOCAL BLOCKING: OFF

2) LOCAL BLOCKING: ON

3) LOCAL BLOCKING: REQ

Description: The local blocking command has the purpose to tell the MSC/TSC, that a technician wants to make service on the TR, and that the MSC/TSC shall take it out of normal operation. Additionally, it protects the technician to perform many of the test commands during normal operation, which could desturb the ongoing calls.

The 01+, 01++ and 01- commands has no effect, if the state is already present.

The 01+ command makes a local blocking request. If the supervisory RX is activated (indicating, that the channel is currently occiopied of a call), the LOC LED will flash to indicate the request. During this period, "LOCAL BLOCKING: REQ" is returned.

During the request period, a 01- command will only clear the request.

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

If forced local blocking 01++ is given or as soon the SUP. RX is off after a local blocking request 01+, frame 28 V1(6), V2(15), V3(6) is sent to MSC/TSC, the red LOC indicator on the front plate turns on and responds to the MSC/TSC commands stops. All current states and selections, when the local blocking was executed, will be maintained. Now all the listed commands will be acces- sible for the technician.

If local deblocking 01- is selected from ON, the TR performs a software reset sequence equivalent to the power-on reset sequence, and sends a frame 28 V1(9), V2(15), V3(6) local deblocking to inform the MSC/TSC, that it now can put the TR into normal operation again. The red LOC indicator is switched off.

If local blocking 01+ or 01++ is selected before mains return has been sent after power-on, the local blocking frame is not sent to MSC/TSC.

02 SOFTWARE RESET

02 Display command function 02

02+ Execute software reset Local blocking necessary 02+

Command description:

Response:

1) SOFTWARE RESET BY 02+ 02 response

2) EXECUTES SOFTWARE RESET 02+ response

Description: Software reset performs exactly the same tasks as the power-on reset sequence with one exception. It can only be activated, if local blocking has been selected, and after the reset sequence, the local blocking will be maintained.

The software reset is a very convenient way to bring the TR back to a known state. The software reset also restores the nonvolatile settings of the EEPROM in the workspace RAM to remove the nonstored changes in settings.

03 ALARM DISPLAY AND RESET

03 Display alarm state 03

03+ Execute alarm reset 03+

03/1 Display latched local alarms 03/1

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Description

XD950 TR unit help

03/2 Display latched CCU alarms 03/2

03/C1 Display current local alarms 03/C1

03/C2 Display current CCU alarms 03/C2

Command description:

Response:

1) ALARMS: L=xx C=xx 03 response

2) ALARM RESET EXECUTED 03+ response

3) xxxxxxxxxxxxxxxx 03/1 and 03/C1 response

4) xxxxxxxxxxxxxxxxxxxxxxxx 03/2 and 03/C2 response

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Description: The 03 command displayes the number of alarms. The latched alarm count (L) is the number of alarms sent to the MSC/TSC. The current alarm count (C) is the number of alarms present, when 03 is executed and followes the current evaluation.

The alarms are transferred to the latched alarm registers, when they are sent to the MSC/TSC. If local blocking has been selected, the alarms are not sent to MSC/TSC and thereby not transferred to the latched registers. The alarms will remain in the latched registers, even when conditions for the alarm are not longer fulfilled, until an alarm reset is executed.

The 03+ command resets all the latched alarms. If the alarms are still present, it will force them to be sent to the MSC/TSC again. The alarm reset frames 22 V1(1) for TR has the same function as the 03+ command.

The 03/1 and 03/C1 displayes the state of the individual alarms generated internally in the TR.

The 03/2 and 03/C2 displayes the state of the individual alarms sent from the CCU.

The display can show three different characters:

0 No alarm N Nonblocking alarm B Blocking alarm

The alarm LED’s will be on, if the latched or current or both registers are set.

The 66 command can point out the actual cause for TX, RX and CU alarms.

The 03/1 and 03/C1 displayed flags are:

DESCRIPTION: V(1),V(2),V(3):

------------ ---------------

1. TX LEVEL 2 6,15,14

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

2. TX LEVEL 1 10,15,1

3. RX LEVEL 2 6,15,7

4. (RX LEVEL 1)

5. CU 6,15,9

6. SUPERVISORY TEST LOOP 6,15,2

7. COOLING FAN 10,15,14

8. TX COMBINER TEST POINT (ANT L1) 10,15,0

9. MASTER OSCILLATOR L2 (TX L2) 6,15,14

10. MASTER OSCILLATOR L1 10,15,13

11. TX OUTPUT VSWR (ANT L1) 10,15,0

12. CCU TIMEOUT ALARM 10,8,15

13. (spare)

14. (spare)

15. (spare)

16. (spare)

The 03/2 and 03/C2 displayed flags are:

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DESCRIPTION: V(1),V(2),V(3):

------------ ---------------

1. TX ANTENNA LEVEL 2 6,15,15

2. TX ANTENNA LEVEL 1 10,15,0

3. RX MULTICOUPLER LEVEL 2 6,15,13

4. RX MULTICOUPLER LEVEL 1 10,15,15

5. (spare)

6. (spare)

7. (spare)

8. (spare)

9. HOUSE 10,1,7

10. HOUSE 10,1,6

11. MAINS W. BATTERY BACKUP 10,1,5

12. HOUSE 10,1,4

13. OBSTRUCTION LIGHT 10,1,3

14. INTRUDER 10,1,2

15. HOUSE 10,1,1

16. FIRE 10,1,0

17. COMMON CONTROL UNIT 10,8,15

18. EXTERNAL 10,8,14

19. EXTERNAL 10,8,13

20. EXTERNAL 10,8,12

21. EXTERNAL 10,8,11

22. EXTERNAL 10,8,10

23. EXTERNAL 10,8,9

24. EXTERNAL 10,8,8

The alarm reset command also has the function to reset the sequence of locking to the external frequency references. If local blocking has not been selected, the TR will retry to lock to FR1, if it is locked to FR2 or is running stand-alone.

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

04 SELFTEST

04 Display last selftest result 04

04+ Start Channel selftest (including RX antenna) Local blocking necessary 04+

04- Start Channel selftest (excluding RX antenna) Local blocking necessary 04-

04/1 Display selftest error flags Local blocking necessary 04/1

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Command description:

Response:

1) LAST SELFTEST: COMPLETED 04 response

2) LAST SELFTEST: FAILED 04 response

3) SELFTEST STARTED 04+ response

4) SELFTEST ERRORS:xxxxxxxx 04/1 response

Description: The 04+ and 04- commands activates the channel selftest function, which can also be activated from the MSC/TSC of frame 22 V1(4). The selftest will only succeed, if the TR is mounted in a complete system with an RFTL converter mounted. It has no meaning for a stand-alond TR.

The 04+ and 04- commands are identical except that the 04- command do not include the RX antenna test. The 04- command can be used together with the CCU Batch B/04- to make simultanuously selftest on several Channel Units. The 04+ command includes the RX antenna test and will not work proporly with the Batch command.

The selftest is made according to the RX diversity configuration (07 command). If a single RX input is configured, the selftest command is completed in about 4 seconds. If diversity is selected, the 04+ and 04- commands initiates a complete selftest procedure for the RXA as well as the RXB paths and takes about 8 seconds to complete.

Selftest initiated from the MSC/TSC includes the RX antenna test and should therefore not be initiated on several channels simultaneously. The MSC/TSC initiated selftest will only test one RX path to meet the maximum specified completion time of 5 seconds. If diversity is provided, the selftest will alternate between the two RX paths each time it is activated.

The inclusion of the RX antenna test is depending of the setting of the 79 command. If 79- has been selected, the RX antenna test will not be included. The 79- setting shall be selected, if the TR is installed in a system, where the RX antenna test facility is not provided.

The selftest sequence executes the following functions:

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

1) Initially it keys the TX, turns on the RFTL switch, modulates the TX with a 1200 Hz tone with a deviation of 3 kHz, turns on the supervisory system, switches the AC voltmeter to testpoint no. 4 and selects an RX measuring path.

2) Waits for about 3 seconds to give time for the supervisory detector to stabilize.

3) Tests the returned AF level to be within +/-6dB with the AC voltmeter.

4) Tests for supervisory L2 to be exceeded.

5) Tests for the returned RSSI signal to be within +2/+14 dBuV.

6) Activates the RFTL Converter output direction switch if RX antenna test shall be included. Else it continues with 9).

7) Waits 0.2 sec.

8) Tests the RX antenna and deactivates the RFTL direction switch.

9) Repeats 2) to 8) with other RX path if necessary.

10) Stops the TX, turns off the RFTL switch, stops the 1200 Hz tone, turns off the supervisory system, switches the AC voltmeter to testpoint no. 0 and restores the RX diversity selection according to the 07 setting.

All the tests sets or clears the corresponding error flags.

The 04 command shows, whether the last selftest has failed or has completed correctly.

The 04/1 command displayes the individual error flags from the selftest, which has the following meaning:

1. RXA: AF LEVEL NOT WITHIN +/-6 dB

2. RXA: SUPERVISORY LEVEL 2 ALARM

3. RXA: RSSI NOT WITHIN +2/+14 dBuV

4. RXA: RX ANTENNA REFLECTION LOSS LOWER THAN 79 SETTING

5. RXB: AF LEVEL NOT WITHIN +/-6 dB

6. RXB: SUPERVISORY LEVEL 2 ALARM

7. RXB: RSSI NOT WITHIN +2/+14 dBuV

8. RXB: RX ANTENNA REFLECTION LOSS LOWER THAN 79 SETTING

07 RX DIVERSITY CONFIGURATION

07 Display RX Configuration 07

07/A Select RXA only 07/A

07/B Select RXB only 07/B

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

07/D Select diversity RX 07/D

07/EE++++ Store RX Configuration in EEPROM ++++

07/EE....

Command description:

Response:

1) RX CONFIGURATION: A

2) RX CONFIGURATION: B

3) RX CONFIGURATION: D

Description: The 07 commands have the purpose to tell the software the actual configuration of the system.

After reset, the stored configuration inits the appropriate setting controlled by the 22 commands.

The setting controls the RX selection at power-up and software reset.

The setting changes the the alarm handling from the RX multicouplers. If A or B is selected, it will generate a blocking RM alarm, if an RMA or RMB alarm respectively is present. If D is selected, a redundant RM alarm is genereted, if RMA or RMB alarm is present, and a blocking RM alarm, if both RMA and RMB alarm is present.

The setting also controls the tasks of the selftest commands 04+ and 04-.

Licensed user: Hans Damm Research A/S

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10 TX KEY

10 Display TX state 10

10+ Turn on TX Local blocking necessary 10+

10- Turn off TX Local blocking necessary 10-

10/T Toggle TX on/off Local blocking necessary 10/T

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Description

XD950 TR unit help

Transmitter commands

Command description:

Response:

1) TX OFF

2) TX ON

3) TX ON PLL: UNLOCKED

Description: The commands control the TX key function

The 10 command displayes the actual state of the TX.

The 10+ command executes the TX on sequence, if the TX is not already keyed.

The 10- command executes the TX off sequence, if it is not already off.

If the TX is on and the PLL is not locked, the response no. 3) will be returned.

The TX on and off sequences are rather complex, and involves the exciter key, the PA key, the DAC power setting and the TX fast/slow lock switch. Serial transfer of data to the shift registers is also done at TX on.

11 DISPLAY TX OUTPUT AND REFLECTED POWER

11 Display TX output and reflected power 11

Command description:

Response:

1) TX: OUT=xx.xW REFL=xx.xW

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

Description: The command displayes the actual forward and reflected power measured with the internal directional coupler through DC test point 10 and 11. The DC reading is converted to power with a conversion table stored in the EPROM.

The 90 commands are used to factory adjust the power meter.

12 DISPLAY TX COMBINER TESTPOINT VALUE

12 Display TX combiner TP value 12

Command description:

Response:

1) TX COMBINER TP: x.xx VDC

Description: The command shows the DC voltage from the detector mounted on the load on the circulator closest to the channel filter for the actual TR. It shows the relative size of the power reflected from the filter together with the power from the other transmitters, which leaks through the filter.

The command is used under adjustment of the channel filter. After a C/12 command, the channel filters tuning screw is just turned to minimum reading without any use of external measuring equipment.

The command is also used to determine the desired alarm level setting in the 78 command.

13 TX POWER LEVEL

13 Display TX power level number 13

13/n Setup TX power level number Local blocking necessary Power level number (1..3)

13/.

13/EE++++ Store TX power level number in EEPROM Local blocking necessary ++++

13/EE....

Command description:

Response:

1) TX POWER LEVEL = x x = 1, 2 or 3

2) INVALID TX POWER LEVEL

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

Description: The commands are used to switch the transmitter between the three preadjusted power levels, which are factory adjusted to 1.5W, 6W and 25W.

The 3 levels can be individually adjusted over the whole possible power range by the 81, 82 and 83 command respectively.

14 DISPLAY TX FREQUENCY DEVIATION

14 Display TX deviation 14

Command description:

Response:

1) TX DEVIATION = x.xx kHz

2) TX DEVIATION = Uncalib.

Description: The 14 command displayes the TX modulation (frequency deviation) actually present on the transmitter.

The measured value is the mean value of the deviation, but it is calibrated in peak value.

For a system with 25 kHz channel spacing the following nominal values are given:

1) 1kHz standard modulation: 3.00 kHz

2) FSK modulation : 3.50 kHz (mean value of 2.80 and 4.20 kHz).

The measurement is made with the build-in AC voltmeter on TP number 5. After the 14 command has been executed, this TP will be selected.

The reading is factory calibrated with the 94 command. When software is upgraded to ver. 1.40 or newer on units, where calibration with the 94 command has not been done, "Uncalib." will be displayed.

17 TX PLL LOOP SPEED

17 Display TX loop speed 17

17+ Select fast TX loop Local blocking necessary 17+

17- Select slow TX loop Local blocking necessary 17-

Command description:

Response:

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

1) TX LOOP: SLOW

2) TX LOOP: FAST

Description: The command controls the PLL speed switch on the Exciter Board, and are implemented for test and repair.

It shall not be used during normal operation.

18 PA KEY

18 Display PA key state 18

18+ Turn on PA key Local blocking necessary 18+

18- Turn off PA key Local blocking necessary 18-

Command description:

Response:

1) PA: ON

2) PA: OFF

Description: The command controls the PA key function, and is used during adjustment of the bias current in the 25W power amplifier.

It shall not be used during normal operation.

19 TX ON/OFF CONTINUOUSLY

19 Display command 19 function 19

19+ Turn TX on and off continuously Local blocking necessary 19+

Command description:

Response:

1) TX ON/OFF CONT. BY 19+ 19 response

2) TX ON/OFF CONTINUOUSLY 19+ response

Description:

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

The 19+ command starts a continuous TX on/off switching with a cycle time of 400 msec., of which the the TX ON function uses 250 msec. and the OFF function uses the remainding.

It is a convenient command to get a repetetive pattern during hardware debugging of the serial transfer lines to the TX synthesizer.

It can also be used to monitor the working of the TX on/off sequences.

The on/off sequence is stopped automatically by the reception of next character. Therefore, it can not run from service screens, which polls the status from the TR. Similarly, it can also not run in a complete system, because the alarm updating from the CCU will stop it.

Licensed user: Hans Damm Research A/S

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20 RX AF CONTROL

20 Display RX AF selection 20

20+ Turn on RX AF Local blocking necessary 20+

20- Turn off RX AF Local blocking necessary 20-

20/T Toggle RX AF on/off Local blocking necessary 20/T

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Description

XD950 TR unit help

Receiver commands

Command description:

Response:

1) RX AF: MUTED

2) RX AF: ON

Description: The command controls the muting of the RX audio path. RX AF is muted after reset, why 20+ normally will be one of the first commands to execute when servicing the RX.

The selection controls the RX enable switch together with the squelch function.

21 SQUELCH CONTROL

21 Display squelch selection 21

21+ Turn on squelch function Local blocking necessary 21+

21- Turn off squelch function Local blocking necessary 21-

21/T Toggle squelch function on/off Local blocking necessary 21/T

Command description:

Response:

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

1) SQUELCH: ON

2) SQUELCH: OFF

Description: The 21 command is provided to enable and disable the squelch function. After a reset, the squelch function is always enabled.

The 84 command controls the threshold of the squelch function.

22 RX A/B INPUT CONTROL

22 Display RX input 22

22/A Select forced RX-A input 22/A

22/B Select forced RX-B input 22/B

22- Select automatic RX-A/B input 22-

Command description:

Response:

1) RX INPUT: A FORCED 22/A response

2) RX INPUT: B FORCED 22/B response

3) RX INPUT: A AUTOMATIC 22- response if RXA is active

4) RX INPUT: B AUTOMATIC 22- response if RXB is active

Description: The 22 commands are used to control the diversity switch in the receiver. If automatic switch-over has been selected, the actual RX input in use will be the one with the highest RSSI output. The automatic switchover can be deselected by forced RXA or RXB select.

After a reset, the resident setting in command 07 controls the state.

23 RX CHANNEL SWITCH COMMAND

23 Display RX channel number 23

23+ Step up RX channel number Local blocking necessary 23+

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Description

XD950 TR unit help

23- Step down RX channel number Local blocking necessary 23-

23/nnnn Switch RX channel number Local blocking necessary RX channel number

23/....

Command description:

Response:

1) CHANNEL RX:nnnn

2) CHANNEL RX:nnnn UNLOCKED

Description: The 23 commands are used to switch the RX channel number without changing the TX channel number. If both the TX and RX channel number shall be changed, the 30 commands shall be used instead.

The 23+ command steps up with 12.5 kHz and the 23- command steps down with 12.5 kHz. Therefore, the displayed channel no. will alternately be an ordinary channel number and an interleaved channel number. If the 23+ is executed on channel 0800, next channel no. is 0001, and if 23- command is executed on channel 0001 next channel no. is 0800.

The 23/nnnn selects a channel directly between 0001..0800.

If the main PLL is unlocked, response no. 2) will be displayed.

After a reset, the RX channel number is the one stored residently with the 30 command.

24 DISPLAY RSSI

24 Display RSSI in dBuV EMF 24

24/0 Display RSSI DC output voltage 24/0

24/1 Display RSSI MSC/TSC result 24/1

24/2 Display RSSI in dBuV EMF 100ms average 24/2

24/3 Dispaly RSSI in dBuV EMF 1s average 24/3

Command description:

Response:

Licensed user: Hans Damm Research A/S

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1) xx.x dBuV EMF RSSI 24 response

2) x.xxV DC AT RSSI OUTPUT 24/0 response

3) xx = MSC/TSC RSSI RESULT 24/1 response

4) xx.x dBuV EMF RSSI 0.1s 24/2 response

5) xx.x dBuV EMF RSSI 1sec 24/3 response

Description: The 24 commands are used to display the result from RSSI (Received Signal Strength Indicator).

The 24, 24/2 and 24/3 commands display the actual RSSI in dBuV in the range -4.0 to 66.0 with 0.5 dB resolution. If the received value is outside this range, a < or > sign will be added ahead of the value. The 24 command displayes the instant value, while the other two displayes the average over 0.1 and 1 second respectively.

The 24/0 command displayes the DC voltage out of the detector. At 0 dBuV EMF it shall be 0.64V, and it increases with 0.02V/dB.

Because the receiver multicoupler shall have a nominal gain of 1 dB, the input amplitude directly to the RX connector of the TR shall be 1 dB higher to display the correct result.

25 MEASURE RX ANTENNA RETURN LOSS

25 Display command function 25

25/A Display RX antenna A Return Loss Local blocking necessary 25/A

25/B Display RX antenna B Return Loss Local blocking necessary 25/B

Command description:

Response:

1) RX ANTENNA TEST COMMANDS 25 response

2) RX ANT. x: =-nn.n dBr Normal measuring response

3) RX ANT. x: =+nn.n dBr Response if REFL>FWD

4) RX ANT. x: <-nn.n dBr Normal response with underflow

5) RX ANT. x: >+nn.n dBr Response with overflow

6) RX ANT. x: ????.? dBr Invalid measuring result

Description: The commands measures and displayes the return loss of the RX antennas on the current RX frequency.

Before using the commands, the TX shall be keyed (10+) and the RF Test Loop shall be activated (32+).

The measurement is made with the following sequence:

Licensed user: Hans Damm Research A/S

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1) The RSSI level of the signal from the RF Test Loop converter (reference level) is measured (nom. +8 dBuV).

2) The direction switch in the RFTL converter is activated to reroute the RFTL converter output to the RX antenna (nom. +12 dB relative to the RM output signal).

3) The RSSI level of the signal reflected from the RX antenna is measured.

4) The direction switch in the RFTL converter is de-activated.

5) The return loss is computed and displayed.

With a nominal RFTL signal of +8 dBuV and an antenna test signal 12 dB higher, the -4 dBuV measuring linit of the RSSI detector gives a measuring range of about -24 dBr.

The display routine can also handle positive values, which is convenient during adjustment and service.

The invalid measuring result occurs, if the reference RSSI level is less than -4 dBuV.

Correct measuring result depends on, that no external signal is coming from the RX antenna.

28 RX MAIN PLL LOOP SPEED

28 Display RX loop selection 28

28+ Select fast RX loop Local blocking necessary 28+

28- Select slow RX loop Local blocking necessary 28-

Command description:

Response:

1) RX MAIN LOOP: SLOW

2) RX MAIN LOOP: FAST

Description: The commands control the PLL speed switch on the RX frequency synthesizer board, and are implemented for test and repair.

It shall not be used during normal operation.

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29 SWITCH RX CHANNEL CONTINUOUSLY

29 Display command 29 function 29

29+ Switch RX channel continuously between current and current+1 Local blocking necessary 29+

29/nnnn Switch RX channel continuously between current and nnnn Local blocking necessary RX channel number

29/....

Command description:

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Response:

1) RX FS SWITCH COMMAND 29 response

2) RX FS SWITCH CONT. 29+ and 29/nnnn response

Description: The 29+ and 29/nnnn commands starts a continuous switching between two RX channel numbers with a cycle time of 160 msec. in total.

It is convenient commands to get a repetetive pattern during hardware debugging of the serial transfer lines to the RX synthesizer.

It can also be used to monitor the working of the switching sequence.

The switching sequence is stopped automatically by the reception of next character. Therefore, it can not run from service screens, which polls the status from the TR. Similarly, it can also not run in a complete system, because the alarm updating from the CCU will stop it.

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30 CHANNEL SWITCH COMMAND

30 Display channel number 30

30+ Step up channel number Local blocking necessary 30+

30- Step down channel number Local blocking necessary 30-

30/nnnn Switch to channel nnnn Local blocking necessary Channel number

30/....

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Description

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Common commands

30/EE++++ Store channel number in EEPROM Local blocking necessary ++++

30/EE....

30/F Display channel frequencies 30/F

Command description:

Response:

1) CHANNEL RX:xxxx TX:xxxx

2) RX:nnn.nnnn TX:nnn.nnnn 30/F response

Description: The 30 commands are used to select the TX and RX channel numbers simul- taneously. If only the RX channel number shall be switched, the 23 commands shall be used instead.

The 30/F command displayes the selected RX and TX channel frequencies in MHz.

The 30+ command steps up with 12.5 kHz and the 30- command steps down with 12.5 kHz. Therefore, the displayed channel numbers will alternately be an ordinary channel number and an interleaved channel number. If the 30+ is executed on channel 0800, next channel no. is 0001, and if 30- command is executed on channel 0001 next channel no. is 0800. The TX channel number is used as reference, and after a step, the RX channel number will alwayes be identical to the TX channel number.

The 30/nnnn selects a channel directly between 0001..0800.

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If an invalid number is stored in the EEPROM, the reset routine will setup the channel no. to 0400.

If the TX is on, when a channel switch command is executed, the TX is automatically stopped before the switch.

The selected channel number shall be in accordance with the channel number sent from the MSC/TSC in the channel activision order. If this is not the case, the channel error LED on the front will turn on to indicate a mismatch to the stored channel no. and thereby probably also to the frequency of the TX combiner channel filter

31 EXTERNAL FREQUENCY REFERENCE CONTROL

31 Display frequency reference selection and state 31

31- Deselect external FR lock Local blocking necessary 31-

31/1 Select FR1 lock Local blocking necessary 31/1

31/2 Select FR2 lock Local blocking necessary 31/2

Command description:

Response:

1) FR:DESELECTED ----------

2) FR:1 LOCKED ----------

3) FR:2 LOCKED ----------

4) FR:1 UNLOCKED ----------

5) FR:2 UNLOCKED ----------

6) -------------- FR2:ON

7) -------------- FR2:OFF

Description: The 31 commands control the locking of the internal TCXO to the external frequency reference.

The 31- command deselects external lock. The TR will then run on its internal TCXO with a frequency accuracy of +/- 2 kHz, which can be fine adjusted by the 80 command.

The 31/1 and 31/2 commands selects lock to FR1 or FR2 respectively.

The response displayes whether it is deselected, or the the selected FR no. and the locking state. The last part of the response shows whether FR2 is detected or not.

If local blocking has not been selected, a switching sequence is performed. Initially, it tryes to lock to

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FR1. If this does not succeed, it alterna- tively tryes to lock to FR2. If this also not succeed, it ultimately disables external lock to run on its internal TXCO only. The switching sequence is reset of the alarm reset command 03+.

The 77 command controls the alarms for the frequency reference.

32 RF TEST LOOP SWITCH

32 Display RF Test Loop output selection 32

32+ Turn on RF Test Loop output 32+

32- Turn off RF Test Loop output 32-

32/T Toggle RF Test Loop output on/off 32/T

Command description:

Response:

1) RF TEST LOOP: OFF

2) RF TEST LOOP: ON

Description: The 32 commands control the RF Test Loop switch mounted in the TR.

The output from the RFTL connector is adjusted to -40 dB relative to the output from the TX connector, and when it is switched off, it will be rejected with at least 40 dB relative to the ON state.

33 LINE RELAIS

33 Display Line Relais selection 33

33+ Select Line Relais RX-line to RX Local blocking necessary 33+

33- Select Line Relais RX-line to TX-line Local blocking necessary 33-

Command description:

Response:

1) LINE RELAIS: ON RX line to RX

2) LINE RELAIS: OFF RX line to TX line

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Description: The 33 command controls the activation of the line relais.

The TX line will always have connection to the TR to enable the FSK RX to monitor the commands from the MSC/TSC. The AF returned on the RX line can, however be switched between the AF from the receiver and the AF from the TX line.

The line relais will be ON under normal conditions. If no power is applied to the TR, the line relais is OFF.

36 MODULATION CONTROL

36 Display modulation selection 36

36/1 Select PM modulation Local blocking necessary 36/1

36/2 Select FM modulation Local blocking necessary 36/2

36/3 Select Direct modulation Local blocking necessary 36/3

Command description:

Response:

1) MODULATION: PM

2) MODULATION: FM

3) MODULATION: DIR.

Description: The command controls the modulation selection.

The 36/1 command select PM-modulation. The De-Emphasis filter in RX and Pre-Emphasis filter in TX is selected.

The 36/2 command select FM-modulation. The De-Emphasis filter in RX and Pre-Emphasis filter in TX is deselected.

The 36/3 command select direct TX modulation. The TX-data input is selected and the TX-line input is deselected.

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35 BLOWER ALARM DISPLAY AND CONTROL

35 Display blower state 35

35+ Turn on blower 35+

35- Turn off blower (temperature controlled) 35-

35/C Display blower control 35/C

Command description:

Response:

1) BLOWER ALARM: OFF 35 response if alarm is off

2) BLOWER ALARM: ON 35 response if alarm is on

3) BLOWER CTRL: ON MANUAL If 35+ has been selected

4) BLOWER CTRL: ON ALARM If main blower alarm on

5) BLOWER CTRL: ON TEMP. If TR temperature over limit

6) BLOWER CTRL: OFF If redundant blower not activated

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The 35/C, 35+ and 35- will generate one of the responses 3) to 6).

Description: The commands displayes the alarm state from the blowers and controls the activation of the blower control output.

The 35 command displayes the current alarm state from the blower unit.

The 35/C, 35+ and 35- controls the blower control output from the TR and has no function, if the attached blower unit do not use this feature.

Four TR’s control each blower, and they all have the possibility to turn it on. The response shows, whether the actual TR has turned it on, but it can have been turned on of other TR’s.

The TR can turn it on due to three different reasons.

If it has been turned on manually with the 35+ command, response 3) is displayed.

If the TR has turned it on due to an alarm from the main blower, 4) is displayed.

If the internal measured temperature in the TR has exceeded +55C, 5) will be displayed. It is stopped again, if the temperature falls below +50C.

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FSK MODEM

40 FSK TX OUTPUT DIRECTION

40 Display FSK-TX output direction 40

40/0 Select FSK-TX output to RX Line Local blocking necessary 40/0

40/1 Select FSK-TX output to TX Local blocking necessary 40/1

40/2 Select FSK-TX output to FSK-RX Local blocking necessary 40/2

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Description

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Command description:

Response:

1) FSK-TX OUTPUT: RX LINE

2) FSK-TX OUTPUT: TX

3) FSK-TX OUTPUT: FSK-RX

Description: The commands have the purpose to switch the output direction of the FSK modulator.

Output to the RX LINE is the normal direction selected.

Output to TX is used during channel selftest, when the FSK modem is used to generate the 1200 Hz test tone used.

Output to FSK-RX can be selected to test the FSK modem. It is then possible to send FSK frames from the FSK-TX to the FSK-RX to test the operation.

41 FSK-TX TONE CONTROL

41 Display FSK-TX tone selection 41

41/0 Select FSK-TX 1800 Hz output Local blocking necessary 41/0

41/1 Select FSK-TX 1200 Hz output Local blocking necessary 41/1

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41- Turn off FSK-TX output Local blocking necessary 41-

Command description:

Response:

1) FSK-TX TONE: OFF

2) FSK-TX TONE: 1800 Hz

3) FSK-TX TONE: 1200 Hz

Description: The commands control the start and stop of continuous tones from the FSK modulator.

They can be very convenient as tone generator during test and debugging.

If a FSK frame output is activated, when a continuous tone is on, the tone is interrupted during the transmission and continued afterwards.

42 FSK TX BUFFER

42 Display FSK-TX buffer content 42

42/h1..h16 Setup FSK-TX buffer content Local blocking necessary FSK-TX buffer content ($0..$F)

42/................

Command description:

Response:

1) FSK-TX: hhhhhhhhhhhhhhhh

Description: The 42 command displayes the actual content of the FSK-TX buffer. It can be used to monitor the frames send to the MSC/TSC under normal operation.

With the 42/h1..h16 command it is possible to setup any frame in the FSK-TX buffer to send it manually. This makes it possible to use it as test generator.

43 FSK TX FRAME OUTPUT

43 Display FSK-TX state 43

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43+ Send FSK frame Local blocking necessary 43+

43/h1..h16 Send FSK frame Local blocking necessary FSK frame ($0..$F)

43/................

Command description:

Response:

1) FSK-TX: STOPPED 43 response if stopped

2) FSK-TX: SENDING 43 response if sending

3) FRAME SEND 43+ and 43/h1..h16 response

Description: The 43 commands are used to activate the transmission of FSK frames.

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The 43 command displayes whether FSK-TX is sending.

The 43+ command activates the transmission of a single frame with the content displayed with the 42 command.

The 43/h1..h16 sends a single frame with the content specified in the parameter.

When transmission of a frame is requested, a delay is made until the output queue is empty.

44 FSK RX FRAME RECEIVE

44 Receive a FSK frame 44

Command description:

Response:

1) hhhhhhhhhhhhhhhh nn nnnn

2) FSK FRAME NOT RECEIVED

Description: The 44 command makes it possible to display the frames received of the FSK-modem. In connection with the continuous command, the frames can be listed on the screen on a PC.

The command displayes the last received frame. If it, however, already has been displayed, response 2) is displayed.

The nn in the response is the number of errors, the FSK-RX has corrected.

The nnnn in the response is a 4-digit bit counter indicating the relative timing of the received frames. By

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continuous reception it will normally increment with 166 for each received frame.

The reception of frames is limited to frames only with a number of corrected bits equal to or lower than the number specified with the 45 command.

45 MAXIMUM BIT ERRORS CORRECTED FOR 44-COMMAND

45 Display max. bit errors 45

45/nn Change max. bit errors Max bit errors (00..99)

45/..

Command description:

Response:

1) MAX. FSK RX ERRORS: nn

Description: The 45 command is implemented to make it possible to reject invalid frames received due to false frame synchronization or noise.

The command has only influence on the reception of frames with the 44 command, and has no influence on the reception criteria for the normal operation.

The default setting after reset is 03.

46 DISPLAY FSK LEVEL DETECTOR

46 Display FSK level detector 46

Command description:

Response:

1) FSK LEVEL DETECTOR = OFF

2) FSK LEVEL DETECTOR = ON

Description: The command displayes the result from the FSK-RX level detector.

The level detector prohibits the FSK-RX to receive frames with low input levels, e.g. due to coupling between MSC/TSC lines.

It has a nominal threshold of -34 dBm on the TX line with a tolerance of +/-3 dB for a TX line setting of

-10 dBm.

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47 MULTIPLE FRAMESYNC CONTROL

47 Display multiple framesync selection 47

47+ Enable multiple framesync Local blocking necessary 47+

47- Disable multiple framesync Local blocking necessary 47-

Command description:

Response:

1) MULTIPLE FRAMESYNC: OFF

2) MULTIPLE FRAMESYNC: ON

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Description

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Description: The command has the purpose to make it possible to disable multiple frame sync. This facility is not used during normal operation.

When multiple framesync is disabled, the FSK-RX rejects new framesyncs during reception of frames.

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Supervisory system

60 ANALOG TEST POINT NUMBER SWITCH

60 Display analog TP selection 60

60+ Step to next analog TP 60+

60/n Select analog TP TP number (0..7)

60/.

Command description:

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Description

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Response:

1) ATP=0 [RX AF]

2) ATP=1 [TX AF]

3) ATP=2 [RX LINE]

4) ATP=3 [TX LINE]

5) ATP=4 [RX DETECTOR]

6) ATP=5 [TX MODULATOR]

7) ATP=6 [FSK RX]

8) ATP=7 [SUP. RX]

Description: The commands control the selection between the 8 analog test points in the TR.

The signal on the selected test point is forwarded through the analog channel to the CCU, where it can be monitored through the speaker and the BNC connector.

The amplitude on the test point can be measured with the 61 command.

After a channel selftest comand, the ATP=0 will be selected.

61 DISPLAY AC VOLTAGE ON ANALOG TEST POINT

61 Display AC voltage on analog TP 61

Command description:

Response:

1) x.xxxV RMS AT ATP=n

Description: The command displayes the AC voltage on the analog test point selected with the 60 command, measured with the built-in AC voltmeter.

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The reading is calibrated in RMS, but actually measures the mean value.

It makes automatic range switch at about 500 mV.

62 DISPLAY DC VOLTMETER READING

62 Display DC voltage on last selected VMTP 62

62/nn Display DC voltage on selected VMTP TP number (00..77)

62/..

Command description:

Response:

1) sxx.xxV DC AT VMTP=nn

2) OVERFLOW AT VMTP=nn

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Description: The command displayes the DC voltage on one of the 64 possible DC test points, of which 36 is used.

The displayed reading is taken from a RAM register array, which is updated every 64/1200 sec. Therefore, some delay can be necessary in connection with automatic equipment.

The test points have the following function:

IF BOARD: 00: RXA 1st LO test point 01: RXB 1st LO test point 02: RXA 2nd LO test point 03: RXB 2nd LO test point 04: RXA FM discriminator 05: RXB FM discriminator 06: -5V supply 07: +8.5V supply RX FS BOARD: 10: Reference PLL loop 11: 2nd LO PLL loop 12: 1st LO negative reference 13: 1st LO PLL loop 14: -10V supply 15: -5V supply 16: +5V supply 17: +8.5V supply EXCITER BOARD: 20: Directional Coupler Forward output 21: Directional Coupler Reflected output 22: ALC voltage 23: TX VCO negative reference 24: TX VCO PLL loop 25: -5V supply 26: +5V supply 27: +8.5V supply

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ANALOG BOARD: 30: -12V supply 31: -5V analog supply 32: +5V analog supply 33: +5V digital supply 34: +10V supply 35: +14V supply with capacitor backup 36: +14V supply 37: +28V supply MISC.: 4x: Used for TX Combiner test point input 5x: Used for Blower alarm input 6x: Not used 7x: Used for mains detector input

63 DISPLAY CURRENT TEMPERATURE

63 Display temperature 63

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Command description:

Response:

1) snn CELSIUS

2) THERMOMETER OVERFLOW

Description: The command displayes the temperature measured with the sensor mounted at the TCXO on the RX frequency synthesizer board.

The thermometer reading is factory adjusted with the 91 command.

64 DISPLAY CURRENT LED STATE

64 Display LED state 64

Command description:

Response:

1) LEDS:xxxxxxxxxxxxxxxx x=0: OFF, x=F: flashing, x=1: ON

Description: The command has been implemented to make it possible for automatic test equipment to monitor the state of the LED’s on the front plate.

The state is displayed raw by raw from the left top corner.

65 DISPLAY POWER SUPPLY INPUT VOLTAGE

65 Display Power Supply input voltage 65

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Description

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Command description:

Response:

1) xxxV AC POWER SUPPLY

2) -xx.xV DC POWER SUPPLY

Description: The command displayes the measured input voltage to the 14V power supply ahead of the mains switch and fuse.

If the input voltage is positive, it assumes it is a 220V AC power supply.

If the input voltage is negative, it assumes it is a -48V DC power supply.

The program uses the measured voltage to determine, whether a Mains fault or a Power Supply fault alarm is sent to MSC/TSC.

66 DISPLAY ERROR FLAGS

66 Display command function 66

66/1 Display TX L2 error flags 66/1

66/2 Display TX L1 error flags 66/2

66/3 Display RX L2 error flags 66/3

66/4 Display RX L1 error flags 66/4

66/5 Display CCU error flags 66/5

Command description:

Response:

1) DISP ERROR FLAGS BY 66/n 66 response

2) xxxxxxxx [TX L2] 66/1 response

3) xxxxxxxx [TX L1] 66/2 response

4) xxxxxxxx [RX L2] 66/3 response

5) xxxxxxxx [RX L1] 66/4 response

6) xxxxxxxx [CC] 66/5 response

Description: The commands are used to point out the specific cause to the five alarms.

The response contains a 1 to indicate an error or 0 otherwise, and has the following meaning from left to

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right:

66/1: TX L2 ALARM

------------------

1. TX OUTPUT BELOW LEVEL 2

2. TX PLL UNLOCKED

66/2: TX L1 ALARM

------------------

1. TX OUTPUT BELOW LEVEL 1

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66/3: RX L2 ALARM

------------------

1. MAIN PLL UNLOCKED

2. 2ND LO PLL UNLOCKED

66/4: RX L1 ALARM

------------------

66/5: CU ALARM

----------------

1. EPROM CHECKSUM ERROR

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67 STOP WATCHDOG TRIGGING

67 Display command function 67

67- Stop watchdog trigging Local blocking necessary 67-

Command description:

Response:

1) STOP WDOG TRIG BY 67-

2) WATCHDOG TRIG STOPPED

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Description

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Description: The command is used to test the proper function of the watch-dog function.

If the 67- command is entered, the program will stop to trig the watch-dog timer, and the watch-dog circuit shall make a hardware reset of the microprocessor after about one second. The normal power-up sequence will then be executed.

68 DISPLAY EPROM CHECKSUM

68 Display evaluated EPROM checksum 68

Command description:

Response:

1) EPROM CHECKSUM:$hh [$hh]

Description: Displayes the computed checksum of the EPROM, which shall be 00. If this is not the case, an CU alarm will be sent to MSC/TSC, and the EPROM shall be replaced.

The value in square brackets is the value, which shall be stored as correction byte to give required checksum of 00.

The command is primarily implemented as support in connection with program development.

69 READ MEMORY LOCATION

69 Display last selected memory address 69

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Description

XD950 TR unit help

69/hhhh Display memory address Memory address ($0000..$FFFF)

69/....

Command description:

Response:

1) $hhhh=$hh

Description: The command displayes the content of a memory location or an I/O port.

It shall be used with care, because it can disturb the normal program operation, when used to read a register or port with read handshake.

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System settings

70 SUPERVISORY L1 SETTING

70 Display supervisory L1 setting 70

70+ Increment supervisory L1 setting 70+

70- Decrement supervisory L1 setting 70-

70/snn Change supervisory L1 setting Supervisory L1 setting (-99..+99)

70/...

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Description

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70/EE++++ Store supervisory L1 setting in EEPROM ++++

70/EE....

Command description:

Response:

1) SUP. L1 SETTING = snn dB

Description: The command is used to change the supervisory level 1 setting. The setting is the S/N ratio in the supervisory loop.

See also command 63.

92 TX LINE GAIN FACTORY SETTING

92 Display TX line calibration constant 92

92+ Increment TX line calibration constant Local blocking necessary 92+

92- Decrement TX line calibration constant Local blocking necessary 92-

92/hh Change TX line calibration constant Local blocking necessary TX line calibration constant ($5A..$B4)

92/..

92/EE++++ Store TX line calibration constant in EEPROM Local blocking necessary ++++

92/EE....

Command description:

Response:

1) TX LINE GAIN = $hh

2) TX LINE GAIN = INVALID

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Description

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Description: The command is used to compensate for the gain variation in the TX AF path. The setting ensures, that the selected line level with the 85 command is accurate.

93 RX LINE GAIN FACTORY SETTING

93 Display RX line calibration constant 93

93+ Increment RX line calibration constant Local blocking necessary 93+

93- Decrement RX line calibration constant Local blocking necessary 93-

93/hh Change RX line calibration constant Local blocking necessary RX line calibration constant ($5A..$B4)

93/..

93/EE++++ Store RX line calibration constant in EEPROM Local blocking necessary ++++

93/EE....

Command description:

Response:

1) RX LINE GAIN = $hh

2) RX LINE GAIN = INVALID

Description: The command is used to compensate for the gain variation in the RX AF path. The setting ensures, that the selected line level with the 86 command is accurate.

94 TX DEVIATION METER CALIBRATION CONSTANT

94 Display TX deviation meter calibration constant 94

94+ Increment TX deviation meter calibration constant Local blocking necessary 94+

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94- Decrement TX deviation meter calibration constant Local blocking necessary 94-

94/hh Change TX deviation meter calibration constant Local blocking necessary TX deviation meter calibration constant ($01..$FF, nom. $80)

94/..

94/EE++++ Store TX deviation meter calibration constant in EEPROM Local blocking necessary ++++

94/EE....

Command description:

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Response:

1) DEV. METER SETTING= $hh

Description: The command is used to calibrate the result of the 14 command.

95 SYSTEM ID

95 Display System ID 95

95/ccc..c Change System ID Local blocking necessary System ID

95/................

95/EE++++ Store System ID in EEPROM Local blocking necessary ++++

95/EE....

Command description:

Response:

1) SYSTEM: cccccccccccccccc

Description: The commands are used to enter and display the system identity.

The system ID can consist of from 1 to 16 ASCII characters and identifies the system type, the TR is intended for.

Licensed user: Hans Damm Research A/S

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96 ITEM NUMBER

96 Display Item number 96

96/ccc..c Change Item number Local blocking necessary Item number

96/............

96/EE++++ Store Item number in EEPROM Local blocking necessary ++++

96/EE....

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Description

XD950 TR unit help

Command description:

Response:

1) ITEM NO: cccccccccccc

Description: The commands are used to enter and display the item number.

The item number can consist of from 1 to 12 ASCII characters and shall be setup to be equal to the item number on the type plate.

97 TYPE NUMBER

97 Display Type number 97

97/cc..c Change Type number Local blocking necessary Type number

97/............

97/EE++++ Store Type number in EEPROM Local blocking necessary ++++

97/EE....

Command description:

Response:

1) TYPE NO: cccccccccccc

Description:

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

The commands are used to enter and display the type number.

The type number can consist of from 1 to 12 ASCII characters and shall be setup to be equal to the type number on the type plate.

98 SERIAL NUMBER

98 Display Serial number 98

98/nnnnnn Change Serial number Local blocking necessary Serial number (000000..999999)

98/......

98/EE++++ Store Serial number in EEPROM Local blocking necessary ++++

98/EE....

Command description:

Response:

1) SERIAL NO: nnnnnn

Description: The commands are used to enter and display the serial number.

The serial number shall consist of 6 digits and shall be setup to be equal to the serial number on the type plate.

99 VERSION NUMBER

99 Display Version number 99

99/cc..c Change Version number Local blocking necessary Version number

99/....

99/EE++++ Store Version number in EEPROM Local blocking necessary ++++

99/EE....

Command description:

Licensed user: Hans Damm Research A/S

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Description

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Response:

1) VERSION NO: cccc

Description: The commands are used to enter and display the version number.

The version number can consist of from 1 to 4 ASCII characters and shall be setup to be equal to the version number on the type plate.

Licensed user: Hans Damm Research A/S

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Description

XD950 TR unit help

TR Functional Description

General commands

00 Display software version number 01 Local blocking: Display state 01+ Local blocking: Conditional request 01++ Local blocking: Forced request 01- Local blocking: Off 02 Display command function 02+ Execute software reset 03 Display alarm state 03+ Execute alarm reset 03/1 Display latched local alarms 03/2 Display latched CCU alarms 03/C1 Display current local alarms 03/C2 Display current CCU alarms 04 Display last selftest result 04+ Start Channel selftest (including RX antenna) 04- Start Channel selftest (excluding RX antenna) 04/1 Display selftest error flags 07 Display RX Configuration 07/A Select RXA only 07/B Select RXB only 07/D Select diversity RX 07/EE++++ Store RX Configuration in EEPROM

1999-02-15

Transmitter commands

10 Display TX state 10+ Turn on TX 10- Turn off TX 10/T Toggle TX on/off 11 Display TX output and reflected power 12 Display TX combiner TP value 13 Display TX power level number 13/n Setup TX power level number 13/EE++++ Store TX power level number in EEPROM 14 Display TX deviation 17 Display TX loop speed 17+ Select fast TX loop 17- Select slow TX loop 18 Display PA key state 18+ Turn on PA key 18- Turn off PA key

Licensed user: Rohde & Schwarz

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Description

XD950 TR unit help

19 Display command 19 function 19+ Turn TX on and off continuously

Receiver commands

20 Display RX AF selection 20+ Turn on RX AF 20- Turn off RX AF 20/T Toggle RX AF on/off 21 Display squelch selection 21+ Turn on squelch function 21- Turn off squelch function 21/T Toggle squelch function on/off 22 Display RX input 22/A Select forced RX-A input 22/B Select forced RX-B input 22- Select automatic RX-A/B input 23 Display RX channel number 23+ Step up RX channel number 23- Step down RX channel number 23/nnnn Switch RX channel number 24 Display RSSI in dBuV EMF 24/0 Display RSSI DC output voltage 24/1 Display RSSI MSC/TSC result 24/2 Display RSSI in dBuV EMF 100ms average 24/3 Dispaly RSSI in dBuV EMF 1s average 25 Display command function 25/A Display RX antenna A Return Loss 25/B Display RX antenna B Return Loss 28 Display RX loop selection 28+ Select fast RX loop 28- Select slow RX loop 29 Display command 29 function 29+ Switch RX channel continuously between current and current+1 29/nnnn Switch RX channel continuously between current and nnnn

1999-02-15

Common commands

30 Display channel number 30+ Step up channel number 30- Step down channel number 30/nnnn Switch to channel nnnn 30/EE++++ Store channel number in EEPROM 30/F Display channel frequencies 31 Display frequency reference selection and state 31- Deselect external FR lock 31/1 Select FR1 lock 31/2 Select FR2 lock 32 Display RF Test Loop output selection 32+ Turn on RF Test Loop output 32- Turn off RF Test Loop output

Licensed user: Rohde & Schwarz

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Description

XD950 TR unit help

32/T Toggle RF Test Loop output on/off 33 Display Line Relais selection 33+ Select Line Relais RX-line to RX 33- Select Line Relais RX-line to TX-line 36 Display modulation selection 36/1 Select PM modulation 36/2 Select FM modulation 36/3 Select Direct modulation 35 Display blower state 35+ Turn on blower 35- Turn off blower (temperature controlled) 35/C Display blower control

FSK MODEM

40 Display FSK-TX output direction 40/0 Select FSK-TX output to RX Line 40/1 Select FSK-TX output to TX 40/2 Select FSK-TX output to FSK-RX 41 Display FSK-TX tone selection 41/0 Select FSK-TX 1800 Hz output 41/1 Select FSK-TX 1200 Hz output 41- Turn off FSK-TX output 42 Display FSK-TX buffer content 42/h1..h16 Setup FSK-TX buffer content 43 Display FSK-TX state 43+ Send FSK frame 43/h1..h16 Send FSK frame 44 Receive a FSK frame 45 Display max. bit errors 45/nn Change max. bit errors 46 Display FSK level detector 47 Display multiple framesync selection 47+ Enable multiple framesync 47- Disable multiple framesync

1999-02-15

Supervisory system

60 Display analog TP selection 60+ Step to next analog TP 60/n Select analog TP 61 Display AC voltage on analog TP 62 Display DC voltage on last selected VMTP 62/nn Display DC voltage on selected VMTP 63 Display temperature 64 Display LED state 65 Display Power Supply input voltage 66 Display command function 66/1 Display TX L2 error flags 66/2 Display TX L1 error flags 66/3 Display RX L2 error flags

Licensed user: Rohde & Schwarz

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Description

XD950 TR unit help

66/4 Display RX L1 error flags 66/5 Display CCU error flags 67 Display command function 67- Stop watchdog trigging 68 Display evaluated EPROM checksum 69 Display last selected memory address 69/hhhh Display memory address

System settings

70 Display supervisory L1 setting 70+ Increment supervisory L1 setting 70- Decrement supervisory L1 setting 70/snn Change supervisory L1 setting 70/EE++++ Store supervisory L1 setting in EEPROM 71 Display supervisory L2 setting 71+ Increment supervisory L2 setting 71- Decrement supervisory L2 setting 71/snn Change supervisory L2 setting 71/EE++++ Store supervisory L2 setting in EEPROM 72 Display LH setting 72/h Change LH setting 72/EE++++ Store LH setting in EEPROM 73 Display LL setting 73/h Change LL setting 73/EE++++ Store LL setting in EEPROM 74 Display LH/LL control 74+ Select LH/LL local control 74- Select LH/LL MSC/TSC control 74/EE++++ Store LH/LL control selection in EEPROM 75 Display supervisory L1 repetition rate 75- Select 20 sec. supervisory L1 repetition rate 75+ Select 60 sec. supervisory L1 repetition rate 75/EE++++ Store supervisory L1 repetition rate in EEPROM 76 Display RX RF blocking alarm delay time 76/nn Change RX RF blocking alarm delay time 76/EE++++ Store RX RF blocking alarm delay time in EEPROM 77 Display external frequency reference alarm selection 77/A Select single FR with nonblocking alarm 77/B Select single FR with blocking alarm 77/C Select dual FR with nonblocking alarm 77/D Select dual FR with blocking alarm 77/EE++++ Store external FR alarm selection in EEPROM 78 Display TX combiner alarm setting 78/nnn Change TX combiner alarm setting 78/EE++++ Store TX combiner alarm setting in EEPROM 79 Display RX Antenna alarm selection 79- Deselect RX Antenna test 79/nn Select RX Antenna test alarm limit 79/EE++++ Store RX Antenna alarm selection in EEPROM

1999-02-15

Licensed user: Rohde & Schwarz

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Description

XD950 TR unit help

Settings

80 Display internal TXCO frequency setting 80+ Increment internal TXCO frequency setting 80- Decrement internal TXCO frequency setting 80/snn Change internal TXCO frequency setting 80/EE++++ Store internal TXCO frequency setting in EEPROM 81 Display TX L1 power setting 81+ Increment TX L1 power setting 81- Decrement TX L1 power setting 81/hh Change TX L1 power setting 81/EE++++ Store TX L1 power setting in EEPROM 82 Display TX L2 power setting 82+ Increment TX L2 power setting 82- Decrement TX L2 power setting 82/hh Change TX L2 power setting 82/EE++++ Store TX L2 power setting in EEPROM 83 Display TX L3 power setting 83+ Increment TX L3 power setting 83- Decrement TX L3 power setting 83/hh Change TX L3 power setting 83/EE++++ Store TX L3 power setting in EEPROM 84 Display squelch setting 84+ Increment squelch setting 84- Decrement squelch setting 84/hh Change squelch setting 84/EE++++ Store squelch setting in EEPROM 85 Display TX line level setting 85/-nn Change TX line level setting 85/EE++++ Store TX line level setting in EEPROM 86 Display RX line level setting 86/snn Change RX line level setting 86/EE++++ Store RX line level setting in EEPROM 89 Display ALC RX line setting 89+ Turn on ALC RX line 89- Turn off ALC RX line 89/EE++++ Store setting in EEPROM

1999-02-15

Factory settings

90 Display TX power meter calibration constant 90+ Increment TX power meter calibration constant 90- Decrement TX power meter calibration constant 90/hh Change TX power meter calibration constant 90/EE++++ Store TX power meter calibration constant in EEPROM 91 Display Thermometer calibration constant 91+ Increment Thermometer calibration constant 91- Decrement Thermometer calibration constant 91/hh Change Thermometer calibration constant 91/EE++++ Store Thermometer calibration constant in EEPROM 92 Display TX line calibration constant 92+ Increment TX line calibration constant

Licensed user: Rohde & Schwarz

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Description

XD950 TR unit help

92- Decrement TX line calibration constant 92/hh Change TX line calibration constant 92/EE++++ Store TX line calibration constant in EEPROM 93 Display RX line calibration constant 93+ Increment RX line calibration constant 93- Decrement RX line calibration constant 93/hh Change RX line calibration constant 93/EE++++ Store RX line calibration constant in EEPROM 94 Display TX deviation meter calibration constant 94+ Increment TX deviation meter calibration constant 94- Decrement TX deviation meter calibration constant 94/hh Change TX deviation meter calibration constant 94/EE++++ Store TX deviation meter calibration constant in EEPROM 95 Display System ID 95/ccc..c Change System ID 95/EE++++ Store System ID in EEPROM 96 Display Item number 96/ccc..c Change Item number 96/EE++++ Store Item number in EEPROM 97 Display Type number 97/cc..c Change Type number 97/EE++++ Store Type number in EEPROM 98 Display Serial number 98/nnnnnn Change Serial number 98/EE++++ Store Serial number in EEPROM 99 Display Version number 99/cc..c Change Version number 99/EE++++ Store Version number in EEPROM

1999-02-15

Licensed user: Rohde & Schwarz

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Description

ADJUSTMENT OF THE XD950

Adjustments of all units, contained in the XD950 Radio Frequency Channel Unit, can only be carried out, when the modules (PCB’s) are in their position in the XD950 unit.

Adjustments on the modules themselves, demands special test fixtures designed and designated to each module.

Maintenance & repair note

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Description

ADJUSTMENT OF THE XD950

General

This section contains a complete adjustment procedure of the XD950. To start the adjustment the top cover has to be removed.

The adjustment locations is illustrated in the end of this adjustment's procedure.

Test equipment required to perform this adjustment procedure is listed below.

Equipment:

Communication TX: 420MHz - 430MHz Stabilock 4040 Test set RX: 410MHz - 420MHz RF Millivoltmeter 10 dBm, 1GHz Boonton 92EA Power Supply 14V 14V, 6.5 Amp Power Supply 26V 26V, 2.5 Amp Test Box - Hans Damm TB901 Frequency Reference 10MHz/100KHz -

1. Factory setting

The following settings have to be checked, or to be set-up before the adjustment.

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Specification: Suggested Model:

Perform the adjustments as followed.

1.1. TR/SR mode

The channel unit software can be switched between TR and SR mode. The setting for this option has to be set-up correctly.

Command: 06 Display state 06- Select SR mode 06+ Select TR mode 06/EE++++ Store the setting in EEPROM

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ADJUSTMENT OF THE XD950

1.2. RX Diversity Configuration

The channel unit software can be set-up to RXA, RXB or diversity configuration, if the channel unit is supplied with two Frond End's the configuration has to be set-up to diversity.

Command: 07 Display configuration 07/A Configure to RXA only 07/B Configure to RXB only 07/D Configure to Diversity 07/EE++++ Store configuration in EEPROM

1.3. Type Number

The channel unit type number is stored in the EEPROM, the type number can consist of from 1 to 12 ASCII characters and shall be set-up to be equal to the type number on the type plate.

Command: 97 Display type number 97/c1..cn Change type number 97/EE++++ Store type number in EEPROM

1.4. Serial Number

The channel unit serial number is stored in the EEPROM, the serial number consist of 6 digits and shall be set-up to be equal to the serial number on the type plate.

Command: 98 Display serial number 98/nnnnnn Change serial number 98/EE++++ Store serial number in EEPROM

1.5.Revision Number

The channel unit revision number is stored in the EEPROM, the revision number consist of from 1 to 4 ASCII characters and shall be set to be equal to the revision number on the type plate.

Command: 99 Display revision number 99/nnnn Change revision number 99/EE++++ Store revision number in EEPROM

2. DC reference adjustment

A DC voltmeter shall be connected to the test point at the Control Board.

R18 at the Control Board shall be adjusted to 2,55 V DC.

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Description

ADJUSTMENT OF THE XD950

3. Temperature reference

A thermometer shall be placed at the top of the 12,8 MHz crystal (or the 12.8MHz oscillator-module) at the RX synthesiser board, and the temperature is measured.

Display the transceiver's current temperature:

Command: 63

In case the measured temperature is higher than the displayed temperature, the Thermometer Factor Setting must be incremented until the displayed temperature achieve the measured temperature:

Command: 63 Display temperature 91+ Increment Thermometer calibration constant 63 91+

In case the measured temperature is lower than the displayed temperature, the thermometer factory setting must be decremented.

Command: 91- Decrement TX line calibration constant

The setting shall be stored in the EEPROM:

Command: 91/EE++++ Store Thermometer calibration in EEPROM

4. Frequency reference input adjustment

Connect a 10 MHz frequency reference to the reference input of the TB901 test box. An oscilloscope with a 10:1 probe shall be connected to J4 pin 23 L602 at the analog board and shall be adjusted to maximum voltage.

Connect the probe to J4 pin 22, and adjust L603 at the analog board to maximum voltage.

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Description

ADJUSTMENT OF THE XD950

5. TRANSMITTER ADJUSTMENT

Perform the adjustments as follows:

The transceiver's RF output connector shall be connected to the STABILOCK's RF input connector.

Set the transceiver to channel 0091:

Command: 30/0091 Switch to channel 0091

5.5. PA bias current adjustment (only high power TR)

Requirement: The bias current shall be adjusted to 150mA. Adjustment: An ampéremeter must be connected to the transceiver’s 26V supply, and the PA key shall be keyed.

Command: 18+ Turn on PA key

Adjust R3 in the 50W power amplifier to 150mA bias current.

In some transceiver versions, the PA-stage only consists of a single power-module. In these cases biasadjustment, is not required.

5.6. Adjustment Of The Power Level

5.6.1. Power level 1

Power level 1 is selected, and the transmitter is keyed, the RF output power of the transmitter i measured by the STABILOCK:

Command: 13/1 Set-up TX power level 1 10+ Turn on TX

Requirement: The power level 1 shall be adjusted to 3W output.

Adjustment In case the output power is higher than the measured power, the TX Power Level 1 Setting must be decremented, until 3W output is achieved.

Command: 81- Decrement TX L1 power setting

In case the output power is lover than the measured power, the setting must be incremented.

Command: 81+ Increment TX L1 power setting

The setting shall be stored in the EEPROM. (cont’nd)

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ADJUSTMENT OF THE XD950

Cont’nd from prior page

Command: 81/EE++++ Store TX L1 power setting in EEPROM

Power level 2 is selected, the output power is measured.

Command: 13/2 Set-up TX power level 2

Requirement: The power level 2 shall be adjusted to 12W output.

Adjustment: The output power is adjusted by incrementing or decrementing the TX power level 2 setting.

Command: 82+ Increment TX L2 power setting 82- Decrement TX L2 power setting

The setting shall be stored in the EEPROM.

Command: 82/EE++++ Store TX L2 power setting in EEPROM

5.6.2. Power level 3

Power level 3 is selected, the output power is measured.

Command: 13/3 Set-up TX power level 3

Requirement: The power level 3 shall be adjusted to 50W high power TR or 20W low power TR output.

Adjustment: The output power is adjusted by incrementing or decrementing the TX power level 3 setting.

Command: 83+ Increment TX L3 power setting 83- Decrement TX L3 power setting

The setting shall be stored in the EEPROM.

Command: 83/EE++++ Store TX L3 power setting in EEPROM

5.7. Adjustment Of The Power Meter

Key the transmitter to power level 3, and measure the output power.

Command: 13/3 Set TX power level 3 10+ Turn on TX

Cont’nd

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ADJUSTMENT OF THE XD950

Cont’nd from prior page

Display the transmitter's power meter.

Command: 11 Display TX output and reflected power

In case the measured power is higher than the displayed power, the TX Power Meter Factory Setting shall be incremented until the powermeter level achieve the measured power.

In case the measured power is lover than the displayed power, the TX Power Meter Factory Setting shall

90+ Increment Thermometer calibration constant

be decremented.

11 Display TX output and reflected power 90+

The setting shall be stored in the EEPROM.

Command: 90/EE++++ Store TX power meter calibration in EEPROM

5.8. Adjustment Of The RF Test Loop Switch

Connect a RF millivoltmeter to the RFTL output connector of the transceiver.

Key the transmitter to power level 3, and switch on the RF test loop switch.

Command: 13/3 Set-up TX power level 3 10+ Turn on TX 32+ Turn on RF Test Loop output Requirement: The output from the RFTL connector shall be adjusted -40 dB relative to the output from the TX connecto

(+7 dBm at 50W output), and when it is switched off, it must be rejected with at least 40 dB relative to the ON state.

Adjustment: Adjust R8 in the RFTL switch to an output from the RFTL connector at +7 dBm.

5.9. Adjustment Of The Internal Frequency Reference

Prior to adjust the frequency reference, the TCXO frequency setting shall be set to zero:

Command: 80/+00 Set internal TXCO frequency setting to 00

The setting shall be stored in the EEPROM:

Command: 80/EE++++ Store setting in EEPROM

Cont’nd.

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ADJUSTMENT OF THE XD950

Cont’nd from prior page

Key the transmitter at channel 0091, and deselect the external frequency reference.

Command: 30/0091 Switch to channel 0091 10+ Turn on TX

Adjust C104 (or the 12.8MHz oscillator-module IC31) at the RX synthesiser board until the TX output frequency is equal to the centre frequency.

Off key the transmitter, and select the external frequency reference:

Command: 10- Turn off TX 31/1 Select FR1 lock

31- Deselect external FR lock 32-

5.10. Adjustment Of The TX Line Level

Prior to adjusting the TX line level, the TX Line Level Setting shall be set to -10dBm.

Command: 85/-10 Change TX line level setting to -10dBm

The setting shall be stored in the EEPROM.

Command: 85/EE+++++ Store TX line level setting in EEPROM

Connect the TX line input connector of the transceiver to the STABILOCK's Mod Gen output connector, adjust the generator to 1.9 V(rms) in 600 ohm with a 1 KHz tone output, and key the transmitter.

Command: 10+ Turn on TX

Requirement: The TX modulation shall be adjusted to a +/- 4,60 KHz deviation.

Adjustment: Adjust R48 at the exciter board to a +/- 4,60 KHz deviation.

Set the STABILOCK's modulation generator to 190 mV(rms) in 600 ohm with 1 KHz .

Requirement: The modulation shall be adjusted to a +/- 3,00 KHz deviation.

Adjustment: In case the TX modulation is higher than a 3,00 KHz deviation, the TX Line Gain Factory Setting shall be decremented, until the deviation is 3,00 KHz.

Command: 92- Increment TX line calibration constant 92-

Cont’nd

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eter

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Description

ADJUSTMENT OF THE XD950

Cont’nd from prior page.

In case the TX modulation is lover than a 3,00 KHz deviation, the TX Line Gain Factory Setting shall be incremented by 92+.

The setting shall be stored in the EEPROM.

Command: 92/EE++++ Store TX line calibration in EEPROM

Off key the transmitter.

Command: 10- Decrement TX line calibration constant

.7. A

Connect the TX line input connector of the transceiver to the STABILOCK's Mod. Gen. Output connector,

adjust the generator to 109 mV(rms) in 600 ohm with a 1 KHz output, and key the transmitter.

Command: 10+ Turn on TX

The modulation at the Stabilock shall display +/- 3,00 KHz deviation.

Display the TX modulation deviation in the transceiver

Command: 14 Display TX deviation

Adjustment: In case the TX deviation is higher than the 3,00 KHz deviation at the Stabilock , the TX deviation mete calibration constant shall be decremented until the deviation is 3,00 KHz as on the Stabilock.

Command: 94- Decrement TX deviation calibration constant 14 Display TX deviation 94- 14

In case the TX deviation is lover than a 3,00 KHz deviation at the Stabilock, TX deviation meter calibration constant shall be incremented until the deviation is 3,00 KHz as on the Stabilock.

Command: 94+ Increment TX deviation calibration constant 14 Display TX deviation 94+ 14

The setting shall be stored in the EEPROM

Command: 94/EE++++ Store TX line calibration in EEPROM

Key off the transmitter. 10-

f TX deviation m

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Description

ADJUSTMENT OF THE XD950

6. RECIEVER ADJUSTMENT

Perform the adjustments as follows:

5.1. Adjustment of the 2’nd local oscillator

Remove the 51 ohm's load from J5 at the RX synthesiser board, and connect a frequency counter instead.

Adjustment:

5.2. Adjustment Of The RF FRONT END

L4, L5 and L6 shall be adjusted in the RF FRONT END. The adjustment is for a high RF-sensitivity, a

minimum of distortion and a high selectivity .

R18 and R26 is an adjustment of the RSSI voltages sloop and zero point.

5.2.1. Adjustment Of L4, L5 And L6

Test signals of 30 dB(1uV)E.M.F. at centre frequency, shall be applied to the FRONT END input. The test signal shall be modulated with a 30 Hz tone to 15 KHz frequency deviation.

The A-input of the oscilloscope shall be connected to the RSSI output terminal of the RF FRONT END (J3 pin1), and the B-input shall be connected to the MOD output terminal of the STABILOCK. The oscilloscope shall be set to NORMAL DC TRIG on channel B, the TIME BASE shall be adjusted to .5 ms/DIV, channel shall be DC attenuated to 100 mV/DIV, and channel B shall be DC attenuated 200 mV/DIV.

The receiver shall be set to channel 0091:

Command: 30/0091

The oscilloscope shall be fine adjusted in such a way that the recording RSSI voltages on the scope is according to Figure 1. L4, L5 and L6 shall be adjusted to maximum amplitude of the RSSI voltages, the TIME BASE of the scope shall be set to 1ms/DIV and L5 shall be adjusted to minimum noise in the bottom of the RSSI wave, the TIME BASE shall be set to .5 ms/DIV, L4 and L5 shall be adjusted so that an ideal waveform as illustrated in Figure 2 is obtained.

Adjust C244 to 20.94500 MHz.

Figure 1 Figure 2

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5.2.2. Adjustment Of R18 And R26

The RSSI voltage shall be continuous displayed:

Command: C/24/2 Display RSSI in dBuV EMF 100ms average

Test signals of 11 dB(uV)E.M.F. and 61 dB(uV) at centre frequency, shall be applied to the receiver input.

The test signal shall not be modulated.

R18 and R26 shall be adjusted so that the RSSI is showing 10 and 60 dB(uV).

The RF FRONT END adjustment shall be controlled by an SND/ND ratio and a distortion measurement.

Connect the transceiver's RX line output to the STABILOCK's AC input. Enable the transceiver's RX audio and disable the Squelch function.

Command: 20+ Turn on squelch function 21- Turn off squelch function SND/ND ratio: A test signal of -2 dB(uV)E.M.F. modulated with 1KHz tone to +/- 3 KHz deviation shall be applied to the FRONT END input.

Requirements: The SND/ND ratio may not be less than 20 dB/SINAD with CCITT filter on.

DISTORTION:

A test signal of 60 dB(uV)E.M.F. and 100 dB(uV)E.M.F. at +/- 1KHz offset frequency, modulated with 1KHz tone to +/- 3,5KHz deviation, shall be applied to the FRONT END.

Measure the distortion with CCITT filter off.

Requirements: The distortion shall be less than 5%.

5.3. Adjustment of the IF Board

Test signal of 60 dB(1uV)E.M.F. on the centre frequency, shall be applied to the RX A input connector of the transceiver.

The test signal shall be modulated with a 1 KHz to +/- 3 KHz frequency deviation.

The receiver shall be set to channel 0091:

Command: 30/0091 Switch to channel 0091

The DC test point 4. shall be continuous displayed.

Command: C/62/04 Display DC voltage on selected VMTP 04

Requirement: The voltage at DC test point 4. shall be adjusted to 4,00 V DC.

Cont’nd

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Cont’nd from prior page

Adjustment: L3 at the IF board shall be adjusted to 4,00 V DC at DC test point 4.

In case of diversity the test signal shall be applied to RX B, and L4 at the IF board shall be adjusted to 4,00 V DC at DC test point 5.

The analog test point 4. shall be continuous displayed.

Command: 60/4 Select analog TP 4 C/61 Display AC voltage on analog TP

Requirement: The voltage at analog test point 4. shall be adjusted to 500mV(rms), while a test signal of 60 dB(1uV)E.M.F.modulated with a 1KHz tone to +/- 3 KHz deviation.

Adjustment: R7 at the IF board shall be adjusted to 500 mV(rms). in analog test point 4.

In case of diversity the test signal shall be applied to RX B, and R16 at the IF board shall be adjusted to

500 mV(rms). in analog test point 4.

5.4. Adjustment of The RX line level

Connect the RX line connector of the transceiver to the STABILOCK's RMS voltmeter. Test signals of 60 dB(uV)E.M.F. at centre frequency shall be applied to the receiver. The test signal shall be modulated with a 1 KHz tone to +/- 3 KHz frequency deviation.

Set the receiver to channel 0091, and enable the RX AF.

Command: 30/0091 Switch to channel 0091 20+ Turn on squelch function

Before the RX line may be adjusted, the RX Line Level Setting shall be set to -10 dB.

Command: 86/-10 Change RX line level setting

Requirement: The RX line level shall be adjusted to 189 mV(rms), with a test signal of 1 KHz to +/- 3KHz deviation, and the RX Line Level Setting set to -10 dB.

Adjustment: In the case the RX line level is higher than 189 mV(rms), the RX Line Gain Factory Setting shall be decremented until the level is 189 mV(rms).

Command: 93- Decrement RX line calibration constant 93-

- In case the RX line level is lover than 189 mV(rms), the RX Line Gain Factory Setting shall be incremented.

Command: 93+ Increment RX line calibration constant

The setting shall be stored in the EEPROM.

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Description

ADJUSTMENT OF THE XD950

5.5. Adjustment Of The Squelch

Test signal of -1 dB(1uV)E.M.F. at the centre frequency, shall be applied to the receiver.

Set the receiver to channel 0091, enable the RX AF and enable the Squelch function.

Command: 30/0091 Switch to channel 0091 20+ Turn on RX AF 21- Turn off squelch function

Requirement: The squelch shall be adjusted to open, with a test signal of -1 dB(1uV) E.M.F.

Adjustment: Increment the squelch setting until the squelch close, then decrement the setting until the squelch open.

Command: 84+ Increment squelch setting 84+

- 84- Decrement squelch setting 84-

The setting shall be stored in the EEPROM.

Command: 84/EE++++ Store RX line level setting in EEPROM

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Description

NOTES

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Page 87

Doc. No. Rev. Date

R310601_F01 1.00 02.06.04

Description

310601 RX FRONT END

XD950

Transceiver Unit

310601

RX Front End

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Description

310601 RX FRONT END

INDEX :

Document Date Description

R310601_F01 020604 Front page R310601_IDX 020604 Index R310601_DES 020604 Description R310601_ADJ 020719 Adjustments R310601_B01 020604 Block diagram R300401-S01 960202 Diagram - RF circuit R300401-S02 900928 Diagram - Log. Det. R300401-A02 941011 Placement R310601-LST Parts list

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Description

310601 RX FRONT END

Description

The RX Front End module contains most of the receiver radio circuits. The TNC input connector for the RX is mounted directly on the module. It gives a 455 kHz and a RSSI (received signal strength indicator) output to the IF board.

Two coaxial cables soldered to the module feeds it with first and second local oscillator injection from the RX frequency synthesizer board.

The channel unit provides space for two modules for a 2-antenna diversity system.

Circuit description

The RX input signal in the frequency range 410 to 420 MHz is first amplified about 10 dB in the RF amplifier Q2, which run with a rather high current for good large signal properties.

The RX signal is then filtered in the 3-pole fixed tuned ceramic band pass filter F1, and lead into 1st mixer IC1, where it is mixed with the 1st local oscillator signal 431,4 to 441,4 MHz to give a 1st IF of 21,4 MHz. The 1st mixer is a high level double balanced mixer with a nominal LO injection of +17 dBm, giving the receiver excellent large signal and intermodulation properties.

1st local oscillator with an amplitude of typically 0 dBm comes from the RX frequency synthesizer board via a coaxial cable. It is amplified and limited in the RF amplifier Q6, and is finally filtered in a 3-pol. band pass filter before it reach the 1st mixer with about +18 dBm. The microprocessor can monitor the injection through the detector with D3.

After 1st mixer follows a 6-pole crystal filter F2. It gives the ultimate rejection of the adjacent channels of about 80 dB together with the required rejection of the image of 2nd IF. The filter is tuned and matched with L4 and L5.

The 1st IF signal is amplified in Q3 and mixed down to 455 kHz in the 2nd mixer IC2, a monolitic double balanced active mixer.

The 2nd LO on 21,855 MHz also comes from RX frequency synthesizer board via a coaxial cable with an amplitude of typically 0 dBm. The microprocessor can monitor the injection through the detector with D2.

After 2nd mixer follows a ceramic filter, to limit the noise bandwith before the signal enters the logarithmic detector, and the IF board.

R22 and R14 loads the filter with the correct impedance and the emitter follower Q4 ensures, that the filter is not loaded of the following circuits. The 455 kHz IF signal is then routed to the 6 pin connector to the IF board.

The signal is also routed to the input of the logarithmic detector IC3 of the signal strength measurement circuit. The output of pin 11 is a DC current source from +5V, which is proportional with logarithm of the input signal strength.

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Description

310601 RX FRONT END

The remaining circuit around IC4 is used for adjustment and temperature compensation of the RSSI output signal. R60 is used to adjust the zero point of the output and R52 to adjust the gain.

D50 together with R55 and R56 temperature compensates the zero point of the RSSI output, and the thermistor R53 together with R54 compensates the slope.

The output voltage shall be 0.64V DC at an input signal from the antenna connector of the system of 0 dBuV (which equals an input signal to the RX front end TNC connector of +1 dBuV), and varies with

0.02V/dB in the range -4 to +66 dBuV.

The RSSI output is used for signal strength measurements, it controls the squelch function and in diversity systems it also controls the switching between the two antennas.

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R310601_ADJ 1.00 02.07.19

Description

310601 RX FRONT END ADJUSTMENTS

R60 Adjust potm. For RSSI treshold R52 Adjust potm. For RSSI gain

L4, L5 and L6

Adj. coils for 21.4 MHz filter

Repair and sevice note!

Please refer to RX Adjustment procedure for XD950 (doc no 110110_ADJ) when adjustments on the front end, is needed!

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Page 95

Doc. No. Rev. Date

2001-09-25R310601-LST

Description

Parts list: RX front-end 410-420MHz R&S

310601 RX front-end 410-420MHz R&S

Pos. Description Item No. Qty Unit 1 500048 PCB for RX front-end NMT450 1 pcs. 2 520001 Shield for front-end 1 1 pcs. 11 810801 Shrinkable tubing 1/8 black 30 mm C1 730018 Cer. cap. 12pF 5% NP0 0805 1 pcs. C2 730025 Cer. cap. 47pF 5% NP0 0805 1 pcs. C3 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C4 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C5 730009 Cer. cap. 2.2pF 5% NP0 0805 1 pcs. C6 - Not used 0 pcs. C7 730023 Cer. cap. 33pF 5% NP0 0805 1 pcs. C8 730022 Cer. cap. 27pF 5% NP0 0805 1 pcs. C9 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C10 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C11 730033 Cer. cap. 220pF 5% NP0 0805 1 pcs. C12 730029 Cer. cap. 100pF 5% NP0 0805 1 pcs. C13 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C14 731102 Cer. cap.100nF 10 % 50V X7R 1206 1 pcs. C15 730029 Cer. cap. 100pF 5% NP0 0805 1 pcs. C16 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C17 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C18 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C19 731102 Cer. cap.100nF 10 % 50V X7R 1206 1 pcs. C20 730025 Cer. cap. 47pF 5% NP0 0805 1 pcs. C21 730019 Cer. cap. 15pF 5% NP0 0805 1 pcs. C22 730029 Cer. cap. 100pF 5% NP0 0805 1 pcs. C23 730009 Cer. cap. 2.2pF 5% NP0 0805 1 pcs. C24 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C25 731102 Cer. cap.100nF 10 % 50V X7R 1206 1 pcs. C26 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C27 730023 Cer. cap. 33pF 5% NP0 0805 1 pcs. C50 731102 Cer. cap.100nF 10 % 50V X7R 1206 1 pcs. C51 731102 Cer. cap.100nF 10 % 50V X7R 1206 1 pcs. C52 731102 Cer. cap.100nF 10 % 50V X7R 1206 1 pcs. C53 731102 Cer. cap.100nF 10 % 50V X7R 1206 1 pcs. C54 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C55 731101 Cer. cap. 47nF 10% 50V X7R 1206 1 pcs. C56 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. C110 730103 Cer. cap. 10nF 10% 50V X7R 0805 1 pcs. D1 600003 Schottky diode LL101A 60V 1 pcs. D2 600003 Schottky diode LL101A 60V 1 pcs. D3 600003 Schottky diode LL101A 60V 1 pcs. D50 600001 Diode LL4148 75V/150mA 1 pcs. F1 772025 BPF 415MHz 3-pol. 10MHz 1 pcs. F2 770020 Cryst. filter 21.4MHz 15kHz 6-pol. 1 pcs. F3 771004 Cer. filt. CFK 455 F8 standard 1 pcs. F4 772026 BPF 436.4MHz 3-pol. 10MHz 1 pcs. IC1 680010 Diode mixer ESMD-C2HX5 450MHz 1 pcs. IC2 633001 IC SA602 mixer SO-8 1 pcs. IC3 631016 IC 78L05A voltage reg. SO-8 1 pcs. IC50 633005 IC SL6654 log detector SO-18 W 1 pcs. IC51 630001 IC LS204CDT dual op. ampl. SO-8 1 pcs. J1 561001 Coax cable for 1st LO 1 pcs. J1 561010 Connector 2-pin for coax 1 pcs. J2 561002 Coax cable for 2nd LO 1 pcs. J2 561010 Connector 2-pin for coax 1 pcs.

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Description

Parts list: RX front-end 410-420MHz R&S

Pos. Description Item No. Qty Unit J3 784007 Terminal strip 36-pin 12.7mm 0 pcs. J4 550001 TNC connector for front-end 1 pcs. L1 760001 Inductor cer. 12nH 20% 1008 1 pcs. L2 760002 Inductor cer. 22nH 20% 1008 1 pcs. L3 760012 Inductor cer. 220nH 10% 1008 1 pcs. L4 763203 Coil 21.4MHz 17 turns SMD 1 pcs. L5 763203 Coil 21.4MHz 17 turns SMD 1 pcs. L6 763204 Coil 21.4MHz 10 turns SMD 1 pcs. L7 760002 Inductor cer. 22nH 20% 1008 1 pcs. L8 760202 Inductor 100uH 10% 160mA 1812 1 pcs. L9 760001 Inductor cer. 12nH 20% 1008 1 pcs. L10 - Not used 0 pcs. L12 760302 Ferr. bead PX 56 1 pcs. L13 760302 Ferr. bead PX 56 1 pcs. L14 700000 Resistor 0 ohm 0805 1 pcs. Q1 610002 Transistor BC857B PNP 45V/0.1A SOT-23 1 pcs. Q2 611005 Transistor BFG198 8GHz SOT-223 1 pcs. Q3 611006 Transistor BF 840 NPN 1 pcs. Q4 610002 Transistor BC857B PNP 45V/0.1A SOT-23 1 pcs. Q5 610002 Transistor BC857B PNP 45V/0.1A SOT-23 1 pcs. Q6 611005 Transistor BFG198 8GHz SOT-223 1 pcs. R1 711103 Resistor 10 kohm 1% 0805 1 pcs. R2 711333 Resistor 33 kohm 1% 0805 1 pcs. R3 711272 Resistor 2.7 kohm 1% 0805 1 pcs. R4 711330 Resistor 33 ohm 1% 0805 1 pcs. R5 711820 Resistor 82 ohm 1% 0805 1 pcs. R6 711220 Resistor 22 ohm 1% 0805 1 pcs. R7 711333 Resistor 33 kohm 1% 0805 1 pcs. R8 711103 Resistor 10 kohm 1% 0805 1 pcs. R9 711471 Resistor 470 ohm 1% 0805 1 pcs. R10 711471 Resistor 470 ohm 1% 0805 1 pcs. R11 711471 Resistor 470 ohm 1% 0805 1 pcs. R12 711510 Resistor 51 ohm 1% 0805 1 pcs. R13 711103 Resistor 10 kohm 1% 0805 1 pcs. R14 711122 Resistor 1.2 kohm 1% 0805 1 pcs. R15 711472 Resistor 4.7 kohm 1% 0805 1 pcs. R16 711220 Resistor 22 ohm 1% 0805 1 pcs. R17 711103 Resistor 10 kohm 1% 0805 1 pcs. R18 711222 Resistor 2.2 kohm 1% 0805 1 pcs. R19 711333 Resistor 33 kohm 1% 0805 1 pcs. R20 711151 Resistor 150 ohm 1% 0805 1 pcs. R21 711104 Resistor 100 kohm 1% 0805 1 pcs. R22 711331 Resistor 330 ohm 1% 0805 1 pcs. R23 711150 Resistor 15 ohm 1% 0805 1 pcs. R50 711152 Resistor 1.5 kohm 1% 0805 1 pcs. R51 711822 Resistor 8.2 kohm 1% 0805 1 pcs. R52 720053 Res.var. 5 kohm 25% 4 mm 1 pcs. R53 620001 Temperature sensor KTY13 GEG 1 pcs. R54 711122 Resistor 1.2 kohm 1% 0805 1 pcs. R55 711103 Resistor 10 kohm 1% 0805 1 pcs. R56 711183 Resistor 18 kohm 1% 0805 1 pcs. R57 711103 Resistor 10 kohm 1% 0805 1 pcs. R58 711101 Resistor 100 ohm 1% 0805 1 pcs. R59 711333 Resistor 33 kohm 1% 0805 1 pcs. R60 720013 Res. var. 1 kohm 25% 4 mm 1 pcs. R61 711152 Resistor 1.5 kohm 1% 0805 1 pcs.

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NOTES

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Doc. No. Rev. Date

R310002_F01 1.00 02.06.05

Description

310002 RX IF

XD950

Transceiver Unit

310002

RX IF Board

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Description

310002 RX IF

310002 RX IF BOARD

INDEX :

Document Date Description

R310002-F01 970502 Front page R310002-IDX 970502 Index R310002-DES 960131 Description R310002_B01 020605 Block diagram R310002_ADJ 020605 Adjustments R300002-S01 900405 Diagram - Detectors - Diversity Switch R300002-S02 911114 Diagram - Power Supply - Test circuit R300002-A03 931013 Placement R310002-LST Parts list

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Description

310002 RX IF DESCRIPTION

310002 RX IF BOARD

Description

The RX IF Board is provided with two 6-pin connectors to interface with the two possible RX Front Ends and a 13-pin connector to the analogue board for interface with the other parts of the transceiver.

It contains two complete 455 kHz limiting amplifiers with quadrature detectors for the two RX sections and the necessary diversity control circuits and switches for the AF and RSSI outputs to select the input with the strongest received signal.

It also contains voltage regulators and test circuits for the IF circuits as well as for the RX Front Ends.

Circuit description

The 455 kHz IF signals from the Front Ends are amplified and mirrored to reference to the positive supply in the transistors Q1/Q2 followed by the ceramic band pass filters F1/F2 to limit the noise bandwidth before the signals enters the limiting amplifiers in IC1/IC2.

L3/L4 are the tuned circuits for the quadrature detectors in IC1/IC2. They are tuned to give maximum AF output of the detectors, which shall give a DC output of the discriminators between 4.0 and 4.5 V DC. The trimmer potentiometers R7/R16 together with the fixed series resistors are adjusted to load the quadrature coils to an AF output on J3 pin 11 of 500 mV RMS at a modulation frequency of 1 kHz and a frequency deviation of 1.5KHz.

After the detectors follows low pass filters to reject the IF signals before the AF diversity switch IC6-A. The op-amp IC5-A buffers the AF output and temperature compensates it together with the thermistor R20, before it leaves the IF board.

IC6-B switches the RSSI signal from the two front ends synchronously with the AF switch. IC6-C controls the mode of operation. If the control input DIVON J3 pin 2 is high, the actual selected RX input is controlled of the microprocessor through the RXBSEL control input, which selects RXA when low and RXB when high.

Under normal operation with DIVON input low, the diversity switches are controlled of the comparator IC4-B, which selects the RX with the highest RSSI signal. The RXA RSSI signal it connected directly to the comparator input, whereas the RXB RSSI signal is amplified a small amount with the op-amp IC3-B. The open collector output comparator IC4-A divides down the RSSI signal input to the diversity comparator again, if RXA is currently selected. The circuit gives a symmetrical signal level depended hysteresis on the switching point, which currently is selected to about 1 dB at 0 dBuV and is about 3 dB at +66 dBuV.

The signal dependent hysteresis gives a good tracking of the best input signal at low input levels, where it is critical, and reduces the generated switching noise at high input levels, where the quality of both signals will be good.

To reduce the switching noise it is very important, that the adjustment of the quadrature coils L3/L4 and the AF level R7/R16 is absolutely identical.

The RX IF Board contains 3 voltage regulators IC7, IC8 and IC9 to supply the different circuits on the IF Board as well as the circuits on the two attached Front End modules.

The IF Board also contains a DC test circuit multiplexer IC10 with the output buffer IC5-B to give the microprocessor access to 8 DC test points on the IF Board and the two Front Ends modules.

ND950training\manual\vol2\310002\R310002_DES Page 1 of 1

Rohde&Schwarz XD950 technical description

Specifications and Main Features

Frequently Asked Questions

User Manual