SGC SG-2020 TEST DOCUMENT - Display Calibration and LED Test

5.8 Continue on through step A
Ref. Point Step Adj. Tuning Knob for:
VCXO ADJ. USB LO TP5 1 61,656.269 KHz
LSB 2 61,666.294 KHz
CW 3 61,663.157 KHz
5.8.1 Adjust display for 3200.
5.8.2 Adjust C146 for maximum amplitude on scope at TP6.
5.8.3 Adjust T6 for maximum amplitude.
5.8.4 Readjust C146 until the frequency counter is within 100 Hz of the BFO
crystal sort value.
BFO ADJ. USB BFO TP6 5 See page 12
LSB 6 See page 12
CW 7 See page 12
LO ADJ. USB LO TP5 8 See page 12
LSB 9 See page 12
CW A See page 12
LED Test
5.9 After completion of step A, press ‘MEM’ and the display should step
through the LED cycle test. Check that all LED’s are functional,
and that no LED is tied to another.
Display Calibration
5.10 Connect frequency counter to audio output (J7 at rear of radio)
5.11 Place radio at these settings:
A. Display to 1.850 MHz
B. Mode to USB
C. BW to 2.7 KHz
5.12 Inject a 1.851-MHz, 3-uV signal and observe that the frequency counter
reads 1,000Hz +/- 10Hz. Adjust the spinner knob if necessary to achieve
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© 2001 SGC Inc
1,000Hz +/- 10Hz. Note: Skip step 5.13 if adjustment is not necessary.
5.13 Press CMD + XCVE and verify that the XCVE, RIT, and SPLIT LEDs
light. Adjust spinner until display reads 1.850 MHz. Press MEM.
5.14 Change the mode to LSB and the signal generator to.
1.849 MHz.
5.15 Verify that the frequency counter reads 1,000 Hz
plus or minus 100Hz.