User's Manual

SRM9000X8 800MHz SERVICE MANUAL

4. ALIGNMENT (LEVEL 3 SERVICE ONLY)

4.1 GENERAL

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 the 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.

Each transceiver will need to be individually tested and to have the resultant calibration data stored within it. This

data cannot be modified by the user or by the normal customisation (eg. channel frequency, selcall ID etc.)

process. It is set during the manufacturing process and may be modified for maintenance purposes by use of the

Alignment Tool.

For customer channels between each pair of test frequencies, an interpolation is automatically carried out to

determine the correct DAC values at the relevant frequency for the above calibration parameters.

For all of the following alignment procedures it is assumed that the radio is connected to a Comms. Analyser or

equivalent collection of test equipment. The alignment is performed at room temperature, with a 50Ω termination

on the antenna connector and with a power supply set to give 13.2V at the radio connector.

Warning

The RF power output from the transmitter during these tests can cause burns and can be dangerous to

some discrete items of test equipment, hence power attenuators may be needed. Also the heat generated

inside the radio after a long period of transmission can be hazardous.

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.