User Manual

ALIGNMENT PROCEDURE
6-9
Part No. 001-3422-003
12.Readjust L253 for minimum distortion (use 30 kHz LPF only).
13.Verify that the receive audio RMS voltage is 150 mV ±50 mV.
14.Measure the % distortion (spec is <3% psophometrically weighted).
15.Adjust the amplitude of the RF signal generator on J501 until an 18 dB SINAD level (psophometrically
weighted) is reached.
16.Adjust L221, L212, L224, L201 and L203 in turn for the best SINAD reading adjusting the generator output as
necessary to maintain an 18 dB SINAD level. DO NOT turn the slug more than 2-turns from the top of the coil.
17.Turn the slug of L221 1/2-turn clockwise. This helps to center the filter tracking across the band.
18.Measure the 12 dB SINAD sensitivity. The RF input level should be less than -116 dBm (0.35 µV).
19.Select a receive channel frequency to the MIDDLE of the band.
20.Set the signal generator to the same frequency with an amplitude of -116 dBm.
21.Adjust the Front-End DAC (DAC 3) value to peak the SINAD reading (this is a very gradual peak).
22.Adjust the RF input level until 12 dB SINAD is measured. The RF input level should be less than -116 dBm
(0.35 µV).
23.Adjust generator RF level to -120 dBm and measure DC (RSSI) voltage on J201, pin 12 of the radio
(spec is less than or equal to 0.90V DC).
24.Adjust generator RF level to -60 dBm and measure DC (RSSI) voltage on J201, pin 12 of the radio
(spec is greater than or equal to 1.75V DC).