Bit Error Rate Testing - Motorola ASTRO XTS 3000 Service Manual

Bit Error Rate Testing

7.7 Bit Error Rate Testing
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Use the following procedure for initial setup using an R-2670 Communication Analyzer.
Procedure 7-18 R2670 (Communication Analyzer) Setup
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Use the following RSS procedure when applicable.
Procedure 7-19 Procedure Using RSS
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Connect the RF Input port of the radio under test to the RF IN/OUT port of the
R2670 Service Monitor.
Setup for R2670 Service Monitor:
1. In the Display Zone, select PROJ 25 STD mode and set the meter to RF
DISPLAY.
2. In the RF Zone configure the analyzer as follows:
RF control: Generate
Preset: B/W: NB
Freq: Test frequency (ex: 851.0625 MHz)
Output Level -50.0 dBm
Gen RF Out RF I/O
3. In the Audio Zone, select the 1011 Hz PAT code and set the deviation
to PROJ25Dev: 2.83 kHz ~.
Configure the radio under test to the BER Test mode - this can be done through
RSS as follows:
1. From the MAIN Menu in RSS, press F2 to select SERVICE ALIGNMENT.
2. Press F5 to select PERFORMANCE TESTING.
3. Press F2 to select BIT ERROR RATE. Enter the test frequency in the Rx
Frequency (MHz) field (ex. 851.0625MHz) and select desired Modulation type
as 12.5kHz/C4FM. Set BER Integration Time (sec) to minimum of 7.2 sec.
4. Press F6 (START/STOP) to start the test.
Monitor the radio's received BER(%). Reduce the analyzer's output level to
achieve standard Bit Error Rate of 5%. Reference sensitivity is the analyzer's RF
output level. Reference sensitivity at 5% Bit Error Rate should be –116 dBm or
less. Note that 5% BER is equivalent to 12 dB Sinad.
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Chapter 7: ALIGNMENT PROCEDURE
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68P81083C85-A March 2004