Simoco SRM9000 User manual

SRM9000 ALIGNMENT TNM-M-E-0019 Issue 1
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ALIGNMENT (LEVEL 3 SERVICE ONLY)
This procedure is applicable to all versions of SRM9000 mobile transceivers.
If the radio contains customer configuration data that must be retained, you must first use the SRM/SRP
Personality Programmer (FPP) software to read all radio configuration files and save them on to alternative
media before commencing the alignment procedure.
When the Alignment is completed, use the FPP software to retrieve this stored data and write it back to the
radio.
It is preferred that the radio remain installed in its aluminium extruded case throughout this alignment
procedure. If the radio is to be aligned when removed from the case, a temporary heat sink must be fitted
under the Transmitter PA module and the receiver output must be kept below 100mW.
Note. Final Tx power adjustments must be performed with the radio board installed in the chassis.
TEST EQUIPMENT
1. Radio transceiver test set CMT, 52/82 or similar.
Note. For alternative equipment, the Mod
Balance test requires internal DC coupling
between the demodulated signal and
demodulation output connector.
2. Variable DC power supply 10.8V to 16.3V current limited to 7 amps
3. Oscilloscope 20 MHz bandwidth minimum
4. SRM9000 Programming & Alignment Breakout
Box As detailed in Figure 0
5. SRM9000 Speaker O/P Breakout Box As detailed in Figure 1
6. Personal Computer 486 DX 66 or better.
Operating system Windows 95 or later.
Minimum RAM - 16MB.
5MB free hard disk space.
Floppy drive - 1.44MB.
Mouse and serial port required
7. SRM/SRP Alignment Tool Computer Software file
8. SRM/SRP Field Personality Programmer
(FPP) Computer Software file
Caution
Preparing the radio for alignment will erase from the radio all customer PMR and Trunking
configuration data (channel, signalling information etc). The only data retained by the Alignment
Tool is the factory alignment data for the radio (DAC settings for Tx power, front-end tuning, etc).
Using the Alignment Tool will allow changes to the original factory alignment and will invalidate
all warranties and guarantees unless performed by an authorised level 3 service centre.

SRM9000 ALIGNMENT TNM-M-E-0019 Issue 1
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Black
Red
Yellow
Blue
Brown
Orange
Green(4)
White (8)
(Not Used)
+470E White
Green
Mic Audio in
Mic Ground
Ground
Handset AF Output
13.8V Switched
On/Off
Rx Data
Tx Data
8
4
7
6
5
3
2
1
RJ45
PRM80
Programming Cable
P/N 9525-001-00016
BNC (F)
Connector
22uF to 47uF
Tant. or Elect
DB25
A
ccess and modify
cable as shown
9000_49/2
25-9Way
Adaptor
PC To
SRM9000
S1
A
F Generator
R
Figure 0 SRM9000 Programming & Alignment Breakout Box
.
.
.
To
SRM9000 P2
Pins 6 & 13
R = Audio power Load (set as appropriate)
or
Resistor 4R 4W for ½ Bridge Speaker option
Resistor 8R 12W for full Bridge Speaker option
600R 1:1
Line Matching
Transformer
To
Noise & Distortion Meter
&
Oscilloscope
9000_49/3b
R
T1
Figure 1 SRM9000 Speaker Output Breakout Box

SRM9000 ALIGNMENT TNM-M-E-0019 Issue 1
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TEST SET-UP
Figure 2 Test Set-up
1. Connect the radio to the test equipment as shown in Figure 4-3.
2. Switch on the DC Power Supply.
7
6
5
4
3
2
1
815
14
13
12
11
10
9
SRM9000
P2
(DB15M)
PC
SRM9000
Programming
and
Alignment
Breakout
Box
S5
Antenna Skt
S1
RJ45
AF
Generator
13.8V DC
Power Supply
CRO
9000_49
+-
Radio
Transceiver
Test
Set
Noise &
Distortion
Meter
SRM9000
Speaker O/P
Breakout
Box
Coax
(<200 mm)

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COMMS Set up
1. Copy the SRM9000 Alignment Tool Computer Software
file to the PC hard drive and run the program
The Alignment Tool Opening Menu is displayed.
2. Go to the Options menu and choose Comms Setup.
3. The Comms Setup dialogue box is displayed.
Select the Comms Port setting appropriate to the
configuration of your PC and choose 9OK.
(Usually COM1)

SRM9000 ALIGNMENT TNM-M-E-0019 Issue 1
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Radio Preparation
Radio parameters are to be aligned sequentially as detailed in this procedure.
1. At the Opening Menu, select the Align Menu
and choose Prepare/Read Radio.
2. The WARNING is displayed.
Choose Noif you want to save the
configuration and use the FPP software to
read and save the data to a file.
Choose Yes if you want to proceed and go to
step 3.
3. The radio alignment data is read (indicated
by percentage bar) and stored.
The test alignment data is downloaded into
the radio.
Note: In test alignment mode the radio is configured only for 12.5 kHz channel spacing, therefore all
alignment is carried out at 12.5 kHz settings unless otherwise specified. When the radio is
configured with the FPP for other channel spacings, the deviation related levels are calculated on
a per channel basis by the radio software.

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Alignment Procedure
Radio alignment must be done in the sequence detailed in the following paragraphs. This alignment
assumes that the radio is functioning normally.
VCO DAC Alignment
1. Select the VCO DAC page.
2. Select Auto Align. The Synth DAC Rx slider will automatically adjust its value for each receiver
alignment frequency to set the VCO loop filter value between 140 and 150.
3. Select PTT and then select Auto Align. The Synth DAC Tx slider will automatically adjust its value for
each transmitter alignment frequency to set the VCO loop filter value between 140 and 150.

SRM9000 ALIGNMENT TNM-M-E-0019 Issue 1
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TCXO (Radio Netting Adjustment)
1. Select the Mute/TCXO page.
2. Select PTT.
3. Adjust the TCXO slider to ensure that the transmit frequency error is within 50Hz for the selected
channel (to be measured on the RF Test Set frequency counter).

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Rx Front End
1. Ensure that the TCX0 Alignment has been done before proceeding with this section.
2. Select the Rx Front End Page.
3. Select Open Mute.
4. Set the Volume slider to 15.
Speaker audio should now be visible on the Scope. If required readjust the Volume slider to a suitable
level.
5. Set the Signal Generator to the Channel 0 carrier frequency, with a 1000Hz modulation signal, a
deviation of ±2 kHz and an RF level of -90dBm.
6. Select Channel 0.
7. Select Auto Align.
The front end will be tuned automatically and finish with an RSSI reading of typically around 150.
8. Repeat Steps 7 to 8 for the remaining 3 Channels (1, 2, & 3).
9. Change deviation to 1.5kHz.
10. Verify that the receiver sensitivity is better than -117.5dBm for 12dB sinad on all channels.
(Sensitivity is typically -120dBm).

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Mute Adjustment
Note. This adjustment has default setting of 1000/2600 and should not need changing except for specific
requirements.
1. Select the Mute/TCXO page and select Open Mute.
2. Set the RF signal generator to the receiver alignment frequency, and adjust the RF level such that the
desired mute opening SINAD (typically 10dB SINAD) is achieved.
3. Select Close Mute and remove the RF input from the radio.
4. Set the Squelch Open and Squelch Close sliders to the fully left position. This ensures the receiver
will be muted.
5. Set the Squelch Close slider to the fully right position.
6. Reconnect the RF input to the radio.
7. Adjust the Squelch Open slider to the right until the mute opens.
8. Reduce the Signal Generator output level by approximately 2dB (or by an amount equal to the
desired mute hysteresis level).
9. Adjust the Squelch Close slider to the left until the mute closes.
10. The mute should now open and close at the desired RF levels.
15. Note. On revision 9 radios and higher, an additional Tx Audio Balance DAC is also provided.
For these radios, the Tx Audio Balance DAC is defaulted to zero for normal setting. However, for a
more accurate setting, the DC voltage at TP745 needs to be noted during Rx and adjusted by the Tx
Audio Balance DAC to give the same reading (to within 10mV).

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RSSI
1. Select the RSSI Cal page.
2. Set the Signal Generator for a RF output level of -90dBm and 2kHz deviation at the specified
frequency.
3. Activate the Store RSSI button.
The receiver RSSI threshold setting is calibrated.

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Tx Power
1. Select Tx Power/Mod page.
2. Select Channel 0.
3. Select the 1W power level.
4. Press the PTT button.
5. Adjust the Tx Final Value slider for a power output of 1W.
6. Repeat step 5 for the remaining 3 Channels (1, 2, & 3).
7. Select the 5W power level.
8. Adjust the Tx Final Value slider for a power output of 5W.
9. Repeat step 8 for the remaining 3 Channels (2, 1& 0).
10. Select the 25W power level.
11. Adjust the Tx Final Value slider for a power output of 25W.
Note that the supply current is less than 6.5A.
12. Repeat step 11 for the remaining 3 Channels (1, 2, & 3).
13 Rev 9C+ only, press “Calibrate TX PA Current” button to automatically set the maximum current limit.
Note: This feature is not available on earlier radios and therefore will not be displayed.
14 Release the PTT button.

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Modulation
1. Select Tx Power/Mod page.
2. Select Channel 0.
3. Select the 1W power level.
4. Set the microphone input signal from the Audio Generator to 1000Hz at 400 mV RMS.
5. Adjust the VCO Modulation Limit slider for a maximum peak deviation of ±2.3kHz
6. Reduce the microphone input level to 40mV RMS and check that the deviation is within the range
±1.25 kHz to ±1.75 kHz.
7. Repeat steps 2 to 7 inclusive for the remaining 3 Channels (1, 2, & 3).
8. Remove the microphone audio input signal.
9. Select the Generate Square Wave function.
10. Select PTT and, while viewing the de-modulated signal on the transceiver test set oscilloscope,
adjust the Modulation Balance slider for the best square wave symmetry.
Note. DC coupling is required on the scope for optimum setting accuracy.
11. Repeat steps 8 to 11 inclusive for the remaining 3 Channels (1, 2, & 3).

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Programming
When all channels have been aligned the radio is programmed with the new alignment data:
1. Select Align and choose Write Alignment.
2. A warning message is displayed.
3. Choose Yes.
New alignment data is written to the radio.
Customers Radio Personality Data
If the Customers Radio Personality Data was saved as a separate file, use the FPP Programmer to write this
data to the radio.