Simoco SRP9100 Manual

1. SRP9130 ALIGNMENT (LEVEL 3 SERVICE ONLY)
This procedure is applicable to all versions of SRP9100 portable 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 cast and ABS case so that appropriate shielding
and battery supply are maintained.
Note. Final Tx power adjustments must be performed with the radio board installed in the chassis.
1.1 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 6.4V to 9.6V at 2.5 amps
3. Oscilloscope 20 MHz bandwidth minimum
4. SRP9100 Programming & Alignment Lead P/N PA-PRLD
5. SRP9100 Radio Test Interface Unit OR
See simple interface circuit in Fig 5.1 P/N PA-RTIU
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
9. SRP9100 Simulated Battery
10. Antenna Adaptor for Portable PA-ACON
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.

3.5mm
2.5mm
DB9F
to PC
3
330R 1% 2
5
2k7
1%
27k
1%
PTT
1uF Bipolar TX AF
In
RX AF
Out
P1761
680R16R
RxD In
TXD Out
470u
25V
470u
25V
2k7
Zener 5v6
27k
1%
1
2
S1
Figure 1-1 SRP9100 Radio Test Interface Unit
Notes for test jig:
1. The PTT switch activates transmit on the portable.
2. Interface data levels are TTL with RS232 polarity, although should work with most personal
computers.
3. 16R resistor simulates speaker load.

1.2 TEST SET-UP
Test Interface Box
Communications Test Set
To PC Serial Port
RX Audio
TX Audio
Antenna
Accessory
Connections To Power Supply
Figure 1-2 Test Set-up
Notes:
1. Connect the radio to the test equipment as shown in Figure above.
2. Use an adaptor (P/N PA-ACON) to provide a coaxial socket termination for the antenna.
3. A battery simulator is used to supply power to the portable. This is an empty battery pack
with external DC connections.
1.2.1 COMMS Set up
1. Copy the SRP9100 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)

1.2.2 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.

1.2.3 Alignment Procedure
Radio alignment must be done in the sequence detailed in the following paragraphs. This
alignment assumes that the radio is functioning normally.
1.2.3.1 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.

1.2.3.2 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).

1.2.3.3 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).

1.2.3.4 Mute/Audio Balance 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 Mute Closed and remove the RF input from the radio.
4. Select the Mute/TCXO page
5. Set the Squelch Open and Squelch Close sliders to the fully left position. This ensures the receiver
will be muted.
6. Set the Squelch Close slider to the fully right position.
7. Reconnect the RF input to the radio.
8. Adjust the
Squelch Open slider to the right until the mute opens.
9. Reduce the Signal Generator output level by approximately 2dB (or by an amount equal to the
desired mute hysteresis level).
10. Adjust the
Squelch Close slider to the left until the mute closes.
11. The mute should now open and close at the desired RF levels.
12. Unsquelch the radio and set the radio volume to minimum.
13. Monitor the DC voltage across the speaker or load.
14. Adjust the Rx Audio Balance DAC to achieve a minimum in the measured DC voltage (within
0V±10mV) and leave at this setting.
15. Note. On revision 2 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 TP731 needs to be noted during Rx and adjusted by the Tx
Audio Balance DAC to give the same reading (to within 10mV).

1.2.3.5 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.
4. Monitor the battery voltage at the simulated battery terminals with an accurate multimeter.
5. Adjust the power supply so that the voltage reads exactly 7.2V ±5mV.
6. Click the Battery button to store the calibration.

1.2.3.6 Tx Power
1. Select
Tx Power/Mod page.
2. Select Channel 0.
3. Select the 0.5W power level.
4. Press the
PTT button.
5. Adjust the Tx Final Value slider for a power output of 0.5W.
6. Repeat step 5 for the remaining 3 Channels (1, 2, & 3).
7. Select the
1W power level.
8. Adjust the Tx Final Value slider for a power output of 1W.
9. Repeat step 8 for the remaining 3 Channels (2, 1& 0).
10. Select the
5W power level.
11. Adjust the Tx Final Value slider for a power output of 5W.
Note that the supply current is less than 2.5A.
12. Repeat step 11 for the remaining 3 Channels (1, 2, & 3).
13 Press “Calibrate TX PA Current” button to automatically set the maximum current limit.
14 Release the PTT button.

1.2.3.7 Modulation
1. Select
Tx Power/Mod page.
2. Select Channel 0.
3. Select the 0.5W power level.
4. Set the microphone input signal from the Audio Generator to 1000Hz at 100mV RMS.
5. Adjust the VCO Modulation Limit slider for a maximum peak deviation of ±2.3kHz
6. Reduce the microphone input level to 10mV 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).

1.2.3.8 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.
1.2.3.9 Customers Radio Configuration Data
If the Customers Radio Personality Data was saved as a separate file, use the FPP Programmer
to write this data to the radio.