User Manual

ALIGNMENT PROCEDURE
6-8
Part No. 001-3422-003
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).
6.8 RECEIVER WITH LOADER BOARD
C A U T I O N
Do not key the transmitter with the generator connected because severe generator damage may result.
NOTE: If the radio is NOT intended to use Diagnostics or is NOT a Radio/Loader board combination see
Section 6.7.
NOTE: All distortion and SINAD measurements are performed with psophometric audio filtering.
1. Set the Diagnostic Enable DAC (DAC 4) to 255, (FFh).
2. Preset tuning slugs of L201, L203, L212, L221 and L224 flush with the top of the can.
3. Preset tuning slugs of L231 and L242 full clockwise and re-adjust L242 counter-clockwise 2 full turns.
4. Preset C241 to the center position (slot in-line with axis of the part).
5. Select a receive channel frequency at the LOW end of the band (-21.45 MHz).
6. Apply a -47 dBm signal from the RF signal generator to J501 on the radio. Adjust deviation for:
1.5 kHz with 1.0 kHz tone for 15 kHz radios or 3 kHz deviation with 1.0 kHz tone for 30 kHz radios.
NOTE: Maintain these deviation levels throughout the test when measuring AC levels, SINAD and % distortion.
7. Adjust the Front End DAC (DAC 3) value to set the voltage on TP281 to 2.5V DC ±0.05V. The DAC setting
will be about 74.
8. Adjust L251 for 2.5V ±0.05V at TP251.
9. Preset L253 for 2.5V DC ±0.05V at J201, pin 13.
10.Lower the RF generator 1.5 kHz for 15.0 kHz radios and 3.0 for 30 kHz radios. Adjust C241 for minimum audio
distortion
11.Reset generator back to center frequency. Tune L231 counter-clockwise for minimum distortion. Again tune
L242 for minimum distortion.