SGC SG-2020 TEST DOCUMENT - Receiver Sensitivity and AGC; Receiver Sensitivity (RMS & Decibel Levels); Receiver AGC Test

12.0 RECEIVER SENSITIVITY TEST
RMS level
12.1 Set radio to 1800.0 KHz, RF max., AF max.
12.2 Set audio distortion analyzer function to voltage reading, 0.1 V range.
12.3 Set RF signal generator to 1800.0 KHz, 0.5 µv output level and adjust
fine tune for 1300 Hz on the frequency counter (and monitor it at the
speaker).
12.4 Read the RMS audio output level on audio analyzer, and compare it
with the expected range of values listed below:
Freq. USB/LSB @ 0.5 µV Input
MHz dB V RMS
1.80 > 10 0.2 - 0.3
3.70 > 10 0.3 - 0.5
7.14 > 10 0.4 - 0.6
14.15 > 10 0.5 - 0.7
21.35 > 10 0.5 - 0.7
29.70 > 10 0.5 - 0.7
Decibel level
12.5 Change the audio analyzer function switch to distortion position, meter
range to -10 to -20 position, and adjust switch sensitivity to give mid-
scale reading.
12.6 Adjust vernier control for 0 dB, switch RF output of signal generator
off, and check for minimum of 10 dB drop, as expected on the table
above.
12.7 Repeat the above tests for USB & LSB in all frequencies listed above,
and verify your readings against the listed reference values (USB =
LSB ± 2 dB).
13.0 RECEIVER AGC TEST
13.1 Set radio to 14150.0 KHz, USB, 2.7 KHz bandwidth, RF max., AF max.
13.2 Set RF signal generator to 14151.0 KHz, output level 0.3 µV.
13.3 Set audio analyzer to voltmeter position,.
13.4 Fine tune signal generator for 1300 Hz on frequency counter.
13.5 Compare the RMS (SPK) voltmeter readings on the analyzer to the RMS
(SPK) readings listed below.
Input(ANT) 0.3 µV 3 µV 30 µV 3 mV 3 V
RMS (SPK) 0.2-0.4 V 1.5-3 V 3-3.5 V 3-3.5 V 3-3.5V
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© 2001 SGC Inc
13.6 Repeat the above steps for the remaining input.