GNC 400 COMM TRANSCEIVER ALIGNMENT PROCEDURE
P/N 005-00051-55 REV. T
Page 4
2.2 Setup Procedure
1.
Preset variable power supply to +27.5 VDC and set the current limit to 4.0 A.
2.
Connect power supply positive output to red 'DC IN +' banana jack on rear panel of
Manual Test panel. Connect power supply negative output to black 'DC IN -' banana jack
on rear panel of Manual Test panel.
3.
Make the following connections for the Manual Test Panel as shown in Figure 1 and
described here. Connect an approved 6 ft RG-223 cable between the comm transceiver
antenna connector and the HP8920A/B RF IN/OUT connector. Connect the 320-00099-
06 Ca Assy, (B), GNC400 COMM to the 26-pin high-density connector on the back of the
comm (J2) and to the surface mount connector J26 on the top side of the comm.
Connect the other end of the cable to the (B) connector on the manual test panel.
Connect COMM AUDIO HI on Manual Test panel to HP8920A/B AUDIO IN HI. Connect
Audio Out on HP8920A/B to Manual Test Panel connector marked COMM MIC AUDIO.
Connect serial port cable from PC to serial port input connector on manual test panel.
4.
Connect positive and negative digital multimeter inputs to COMM IF AGC and GND
outputs, respectively, on Manual Test panel. Set up DVM to measure DC voltage in
autoscale.
5.
Plug AC power cord into rear of test panel. Plug AC power cord into 120VAC outlet.
6.
Insure that PANEL POWER push-button switch and UNIT POWER push-button switch
are not depressed and are not lighted (OFF). Turn on external power supply. Push
PANEL POWER switch to turn on. Verify that lighted push-button lights up. Push UNIT
POWER switch to turn on. Verify that lighted push-button lights up. Monitor 28V voltage
with DVM. Set voltage of external power supply at +27.5 VDC. Push UNIT POWER
switch to turn off.
7.
Test Fixture is now ready for GNC400 COMM XCVR assembly alignment.
