SGC SG-2020 TEST DOCUMENT Test Manual page 4

SGC TEST DESCRIPTION
NOTE: Any adjustments made to the SG-2020, besides the R46 CW sidetone
adjustment are NOT covered by the warranty.
The following are tests performed on a fully assembled SG-2020 transceiver.
TEST EQUIPMENT REQUIRED
Audio Signal Generator
(Audio out applied to the microphone connector of SG-2020 under test)
RF Noise Generator
RF Sinusoidal Signal Generator
RF Spectrum Analyzer in addition to a RF Sweep Generator
(Connected through an attenuator of min. 35 dB to the dummy load output.)
Oscilloscope Tektronix 465B or equivalent
Current meter 0-1 Amp Range
Current meter 0-10 Amp Range
Voltmeter Fluke 77 or equivalent
Power Supply PS-10 or equivalent 10-amp power supply
Frequency Counter (connected to the vertical output of oscilloscope.)
Audio Distortion Analyzer (connected at the speaker/headphone jack)
Bird Wattmeter model 43 or equivalent.
1.0 L.O. PLL ERROR VOLTAGE
1.1 Connect voltmeter to TP3 and GND on the Exciter PCB.
1.2 Dial 29700.0 KHz on the display.
1.3 Verify voltage reading is less than 16 VDC. If not, adjust the spacing
between the windings on L18. Pull the windings together for a
lower-voltage reading or spread windings for a higher-voltage reading.
1.4 Change the frequency to 1800.0 KHz.
1.5 Verify new voltage reading is approximately 3 VDC.
2.0 ALIGN RECEIVE IF TRANSFORMERS
2.1 Connect signal generator to antenna input.
2.2 Connect voltmeter to AGC TP13 and GND on the Exciter PCB.
2.3 Set display frequency to 14150.0 KHz USB, signal generator to receiver
frequency +1 KHz and adjust output level of signal generator (typical-
ly 10 µV) for 5 VDC reading on the voltmeter.
2.4 Adjust T3 and T4 for maximum AGC voltage, while reducing signal
generator output as necessary to keep AGC voltage near 5 VDC.
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331
E-mail: sgc@sgcworld.com Web site: http://www.sgcworld.com
4
© 2001 SGC Inc