SGC SG-2020 TEST DOCUMENT Test Manual page 7

5.16 Set all 20 default channels to factory preset frequencies.
See page 20 of th SG-2020 Operations manual, Version 2.01.
6.0 TRANSMIT SSB BALANCE (USB vs LSB) CHECK
6.1 Set display for 1850.0 KHz, USB and key microphone.
6.2 Increase level of audio generator applied at the microphone jack (1.3
KHz, sinusoidal) until output power reads 10 watts.
6.3 Unkey mic, change to LSB and rekey mic. Power output in LSB must be
within 5 watts of USB.
6.4 Set whichever SSB is higher to 10 W, and check that the other SSB is 5W
or greater .
6.5 Repeat the above steps for frequencies: 3700.0, 7140.0, 14150.0, 18150.0,
29700.0 KHz then verify that USB/LSB difference is less than 5W.
Carrier Level Check( TX 20W, USB, BW=2.7, 1.3 KHz at microphone)
6.6 Set radio to 1850.0 KHz, USB.
6.7 Connect 1300 Hz audio signal to mic input.
6.8 Key radio and adjust output level of audio generator until radio is trans-
mitting 20 watts.
6.9 Adjust frequency knob on the spectrum analyzer until the signal trans-
mitted is displayed. Read the dB level of this signal.
6.10 Remove the signal from the microphone and check that the carrier level
decreases to at least 40 dB below the dB level of the applied signal.
7.0 Power - Meter LED's
This test checks that the power meter indicates properly for FWD and REV
power readings. NOTE: Precise calibration is not supported.
Forward power
7.1 Set radio to 14150.0 KHz, USB, BW=2.7, connect audio input to micro-
phone connector and key mic box.
7.2 Increase audio input (1.3 KHz) while observing the LED's and watt
meter.
7.3 At approximately 14W - all 5 green LED's should light.
7.4 At approximately 20W - all 5 green and 2 red LED's should light.
7.5 At approximately 25W - all 10 LED's should light
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