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Simoco SRP9100 Alignment Procedure
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Simoco SRP9100 Alignment Procedure

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1.
SRP9130 ALIGNMENT (LEVEL 3 SERVICE ONLY)
This procedure is applicable to all versions of SRP9100 portable transceivers.
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.
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
T
E
EST
QUIPMENT
1.
Radio transceiver test set
2.
Variable DC power supply
3.
Oscilloscope
4.
SRP9100 Programming & Alignment Lead
5.
SRP9100 Radio Test Interface Unit OR
See simple interface circuit in Fig 5.1
6.
Personal Computer
7.
SRM/SRP Alignment Tool
8.
SRM/SRP Field Personality Programmer
(FPP)
9.
SRP9100 Simulated Battery
10.
Antenna Adaptor for Portable
Caution
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.
6.4V to 9.6V at 2.5 amps
20 MHz bandwidth minimum
P/N PA-PRLD
P/N PA-RTIU
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
Computer Software file
Computer Software file
PA-ACON

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Summary of Contents for Simoco SRP9100

  • Page 1 SRP9130 ALIGNMENT (LEVEL 3 SERVICE ONLY) This procedure is applicable to all versions of SRP9100 portable transceivers. 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).
  • Page 2 2.5mm RX AF 680R 470u 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.

  • Page 3: Comms Set Up

    DC connections. 1.2.1 COMMS Set up Copy the SRP9100 Alignment Tool Computer Software file to the PC hard drive and run the program The Alignment Tool Opening Menu is displayed. Go to the Options menu and choose Comms Setup.
  • Page 4 The Comms Setup dialogue box is displayed. Select the Comms Port setting appropriate to the configuration of your PC and choose (Usually COM1)
  • Page 5 1.2.2 Radio Preparation Radio parameters are to be aligned sequentially as detailed in this procedure. At the Opening Menu, select the Align Menu and choose Prepare/Read Radio. The WARNING is displayed. Choose No if you want to save the configuration and use the FPP software to read and save the data to a file.
  • Page 6 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 Select the VCO DAC page. 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.
  • Page 7 1.2.3.2 TCXO (Radio Netting Adjustment) Select the Mute/TCXO page. Select PTT. 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).
  • Page 8 1.2.3.3 Rx Front End Ensure that the TCX0 Alignment has been done before proceeding with this section. Select the Rx Front End Page Select Open Mute. 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.
  • Page 9 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. Select the Mute/TCXO page and select Open Mute. 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.
  • Page 10 1.2.3.5 RSSI Select the RSSI Cal page. Set the Signal Generator for a RF output level of –90dBm and 2kHz deviation at the specified frequency. Activate the Store RSSI button. The receiver RSSI threshold setting is calibrated. Monitor the battery voltage at the simulated battery terminals with an accurate multimeter. Adjust the power supply so that the voltage reads exactly 7.2V ±5mV.
  • Page 11 1.2.3.6 Tx Power Select Tx Power/Mod page. Select Channel 0. Select the 0.5W power level. Press the PTT button. Adjust the Tx Final Value slider for a power output of 0.5W. Repeat step 5 for the remaining 3 Channels (1, 2, & 3). Select the 1W power level.
  • Page 12 1.2.3.7 Modulation Select Tx Power/Mod page. Select Channel 0. Select the 0.5W power level. Set the microphone input signal from the Audio Generator to 1000Hz at 100mV RMS. Adjust the VCO Modulation Limit slider for a maximum peak deviation of ±2.3kHz Reduce the microphone input level to 10mV RMS and check that the deviation is within the range ±1.25 kHz to ±1.75 kHz.
  • Page 13 1.2.3.8 Programming When all channels have been aligned the radio is programmed with the new alignment data: Select Align and choose Write Alignment. A warning message is displayed. 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.