Specifications

Spectrum Test
1. Connect a spectrum analyzer to a sampled RF output of the radio.
2. Press the PTT switch. Observe the output spectrum on the spectrum analyzer.
3. All spurious and harmonics should be at least 60 dB below the carrier level.
4. Release the PTT switch.
RECEIVER PERFORMANCE TESTS
SINAD Sensitivity
1. Connect the FM signal generator of communication service monitor to the antenna jack.
2. Connect a SINAD meter across the speaker leads.
3. Turn the SQUELCH control fully counterclockwise for maximum noise.
4. Adjust the VOLUME control to approximately mid-range.
5. Set the FM signal generator or service monitor to the receive frequency. The modulation should be set for 3
kHz deviation of a 1 kHz tone.
6. Adjust the generator RF level so that the SINAD meter reads 12 dB. The signal generator RF level should
be .35 uV or less.
Noise Quieting Sensitivity
1. Connect a VOM to the speaker leads.
2. Turn the SQUELCH control fully counterclockwise for maximum noise.
3. With no RF signal generator or communication service monitor connected to the radio, adjust the
VOLUME control to obtain a noise reading of 1 volt RMS on the VOM.
4. Connect the RF signal generator or service monitor to the radio. Set the RF frequency to the receiver
frequency of radio and remove any modulation.
5. Adjust the signal generator RF level for a noise reading on the VOM of 0.1 volt RMS. This is the 20 dB
noise quieting point. the RF level should be 0.5 uV or less.
Squelch Sensitivity
1. Set the RF signal generator or service monitor to the receive frequency. Set the modulation to 3 kHz
deviation of a 1 kHz audio tone.
2. Reduce the signal generator RF output to zero.
3. Rotate the SQUELCH control clockwise to the point where the speaker noise just goes away.
4. Increase the signal generator or service monitor RF level until the speaker noise returns. This is the
threshold squelch setting. The generator output level should not exceed 0.20 uV.
5. Turn the SQUELCH control to maximum clockwise rotation.
6. Increase the generator output level until the squelch opens (busy LED is on). The output level should be
between 10 and 20 dB (3 to 10 times) above the threshold setting.
MONOGRAM SERIES LBI-38865
PERFORMANCE TEST
Page-27-
Nov. 94