Apollo SL40 User Manual

Troubleshooting
Apollo SL40 Field Maintenance Manual
19
RECEIVER SENSITIVITY
The speaker audio level is measured using the HP8920.
Procedure
1. Set the HP 8920 as listed below. Use Figure 3 and Figure 5 as guides.
Press PRESET
Press RX: function
Using the CURSOR control knob or the USER keys set:
RF GEN Freq 118.00 MHz
Amplitude 1,000 µ volts
RF OUTPUT RF OUTPUT
AF Freq 1,000 / 85%
Ext Load 4 ohms
AC LEVEL W
2. Connect speaker load to the HP8920 audio in. Set SINAD low level to 4 dB (LO=4).
Turn SL40 volume control until AC LEVEL on HP8920 reads 12 watts.
3. The distortion level on the HP8920 should be < 5%.
4. Reduce the AF Freq. modulation level on the HP8920 to 30 The distortion level on the
HP8920 should be < 5% and the noise level should be ≥ 25 dB.
5. Disable the squelch by pulling out on the volume knob. Reduce the signal generator
amplitude until the HP8920 displays a 6 dB SINAD value (S+N/N). The amplitude level
should be <1 volt.
Figure 5. Receiver Test Setup

Apollo SL40 Specifications

General

Brand	Apollo
Model	SL40
Category	Transceiver
Language	English