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ALIGNMENT AND TROUBLESHOOTING PROCEDURES

14 LBI-38438A

3. Connect the audio oscillator and apply a 1 kHz tone at 850 mVrms to MIC HI, J701-

4. Connect the deviation monitor to the antenna connector, J1 through a 30 dB

decoupler. Key the radio. Set DEV ADJUST, RV201 for ±3.75 kHz deviation.

4. Set RV202 fully clockwise. Remove P602 from position 1-2 and set aside. Apply a

400 Hz tone to J602-2 and with the radio keyed, vary its amplitude until the

Deviation Monitor reads 2 kHz. Note the level.

5. Change the audio oscillator frequency for a 10 Hz tone at the same level and set

LOOP MOD ADJUST RV203 for a deviation of 2 kHz. Unkey the radio.

6. Disconnect the audio oscillator and replace P602 in position 1-2.

7. Select a frequency with Tone Channel Guard.

8. Key the radio and set CG DEVIATION ADJUST RV202 for a deviation reading of

±0.75 kHz.

NOTE

If Channel Guard is not used on any frequency channel, CG DEV ADJUST, RV201 may be set

for ± 4.5 kHz deviation instead of ±3.75 kHz.

5.1.6 Audio Check

5.1.6.1

Audio Sensitivity

1. Connect audio oscillator output to MIC HI, J701-4. Adjust output for 1 kHz at 1

Vrms.

2. Reduce oscillator output until deviation monitor indication falls to ±3.0 kHz for

radios without Channel Guard or to ±2.25 kHz for radios with Channel Guard.

Oscillator output voltage should be less than 120 millivolts.

GE MLSH041 User Manual

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