User's Manual

SECTION 2: FACTORY TEST PROCEDURE
401855 Page 15



Diversity Reception
Step 1 Inject an on-frequency signal at a level equal to Receiver 1 12dB SINAD level, modulated
with a 1 KHz test tone at ±5.0 KHz deviation into Receiver 1.
Step 2 While monitoring TP1 with the digital multi-meter, adjust RSSI1 low adjust potentiometer
(R12) for a reading of 0.750 VDC ±10 mV.
Step 3 Increase the amplitude of the signal by 50 dBm.
Step 4 While monitoring TP1 with the digital multi-meter, adjust RSSI1 high adjust potentiometer
(R11) for a reading of 2.75 VDC ±10 mV.
Adjustments R11 and R12 are interactive adjustments, therefore continue adjustments until the DC voltage
at TP1 is 0.750 VDC for the receiver’s 12 dB SINAD level and 2.75 VDC for a 50 dBm increase from the
receiver’s 12 dB SINAD level.
Step 5 Inject an on-frequency signal at a level equal to Receiver 2 12dB SINAD level, modulated
with a 1 KHz test tone at ±5.0 KHz deviation into Receiver 2.
Step 6 While monitoring TP2 with the digital multi-meter, adjust RSSI1 low adjust potentiometer
(R10) for a reading of 0.750 VDC ±10 mV.
Step 7 Increase the amplitude of the signal by 50 dBm.
Step 8 While monitoring TP2 with the digital multi-meter, adjust RSSI1 high adjust potentiometer
(R9) for a reading of 2.75 VDC ±10 mV.
Adjustments R9 and R10 are interactive adjustments, therefore continue adjustments until the DC voltage
at TP2 is 0.750 VDC for the receiver’s 12 dB SINAD level and 2.75 VDC for a 50 dBm increase from the
receiver’s 12 dB SINAD level.
Step 9 Inject an on-frequency signal at a level equal to Receiver 3 12dB SINAD level, modulated
with a 1 KHz test tone at ±5.0 KHz deviation into Receiver 3.
Step 10 While monitoring TP3 with the digital multi-meter, adjust RSSI1 low adjust potentiometer
(R33) for a reading of 0.750 VDC ±10 mV.
Step 11 Increase the amplitude of the signal by 50 dBm.
Step 12 While monitoring TP3 with the digital multi-meter, adjust RSSI1 high adjust potentiometer
(R35) for a reading of 2.75 VDC ±10 mV.
Adjustments R33 and R35 are interactive adjustments, therefore continue adjustments until the DC voltage
at TP3 is 0.750 VDC for the receiver’s 12 dB SINAD level and 2.75 VDC for a 50 dBm increase from the
receiver’s 12 dB SINAD level.