1 110110 XD950 Transciever 50W
Z
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
12
13
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
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
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.
Page 1 of 1
Doc. No. Rev. Date
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.
Page 1 of 1
Doc. No. Rev. Date
990215
Description
XD950 TR unit help
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
Page 1 of 57
Doc. No. Rev. Date
990215
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
Page 2 of 57
Doc. No. Rev. Date
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
990215
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
Page 3 of 57
Doc. No. Rev. Date
990215
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
Licensed user: Hans Damm Research A/S
Page 4 of 57
Doc. No. Rev. Date
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
990215
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
Page 5 of 57
Doc. No. Rev. Date
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:
990215
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
Page 6 of 57
Doc. No. Rev. Date
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
990215
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
Page 7 of 57
Doc. No. Rev. Date
990215
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
Page 8 of 57
Doc. No. Rev. Date
990215
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
Page 9 of 57
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
Doc. No. Rev. Date
990215
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
Page 10 of 57
Doc. No. Rev. Date
990215
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
Page 11 of 57
Doc. No. Rev. Date
990215
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
Page 12 of 57
Doc. No. Rev. Date
990215
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
Page 13 of 57
Doc. No. Rev. Date
990215
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
Page 14 of 57
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
Doc. No. Rev. Date
990215
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
Page 15 of 57
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990215
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:
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Description
XD950 TR unit help
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:
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Description
XD950 TR unit help
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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Description
XD950 TR unit help
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:
990215
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
XD950 TR unit help
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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Description
XD950 TR unit help
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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