SGC SG-2020 TEST DOCUMENT, Installation And Operation Manual

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© 1998 SGC Inc
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
17.0 ALIGNMENT/TEST PROCEDURES
17.1. PHASE LOCK LOOP ERROR VOLTAGE
Required Test Equipment
a) Digital Volt Meter
Procedure
Connect the DVM to the PLL error voltage test point (TP3) on the
Exciter PCB and Gnd. Tune the SG-2020 to 29.7 MHz and verify
the voltage is less than 16 V. If the voltage is greater than 16 V when
tuned to 29.7 MHz adjust spacing between windings of L18. Tune to
1.8 MHz and verify the voltage is greater than 3 V .
17.2 ALIGN RECEIVE IF TRANSFORMERS
Required Test Equipment
a) Digital Volt Meter
b) HP8640 RF signal generator or equivalent
Procedure
Tune to 14.2 MHz and connect the DVM to the AGC test point
(TP13) and Gnd on the Exciter PCB. Set the signal generator to the
receive frequency and adjust the output level of the generator, so the
AGC is approximately 5 volts. Adjust T3 and T4 for maximum
AGC voltage, reducing the output level of the signal generator as
necessary to keep the voltage near 5 volts.
17.3 RECEIVER AGC TEST
Required Test Equipment
a) Digital Volt Meter
b) HP8640 RF signal generator or equivalent
c) Frequency Counter
Procedure
Set RF and VOLUME controls to maximum fully CW. Adjust
RF generator to 14.2 MHz. Set bandwidth to 2.7 USB and tune radio
to 14.2 MHz and adjust tuning for 1 KHz at the speaker output.
Speaker output levels should be as follows: