RT-9000C Hardware Supplement
Document No. 8128000602
Revision A (19 Mar 2007)
8-28
RT-9000 C
13. Re-adjust the RF signal generator output frequency to 7.999 MHz.
14. Adjust potentiometer 1A2A3 R85 (LSB RX) until the audio voltmeter indicates the desired
reading. The factory setting is 0 dBm.
15. Disconnect the RF signal generator, audio voltmeter, and 600-Ohm load resistor. Re-connect
the small 6-pin connector disconnected in step 5.
Transmit Audio Input Adjustment
16. Connect 150 Watt 50-Ohm dummy load to RT-9000C ANT connector J4.
17. Connect a 600-Ohm output audio signal generator to RT-9000C Transmit Audio USB Input at
rear-panel AUDIO connector J5, pins H and J.
18. Connect an audio voltmeter as follows: Connect the positive input lead to test point 1A2A3 TP1.
Connect the negative lead to the radio chassis.
19. Adjust the audio signal generator output as follows; Frequency: 1.0 kHz, Output level: Set to
the desired transmit audio level. The factory setting is 0 dBm. The RT-9000C transmit audio
input range is –20 dBm to +10 dBm.
20. Adjust potentiometer 1A2A3 R2 (USB TX) until the audio voltmeter indicates 0.230 Vrms (This
is equivalent to 0.65 V p-p).
21. Disconnect the audio voltmeter positive lead and reconnect it to test point 1A2A3 TP2.
Disconnect the audio signal generator and re-connect it to Transmit Audio LSB Input at rear-
panel AUDIO connector J5, pins S and T.
22. Adjust potentiometer 1A2A3 R10 (LSB TX) until the audio voltmeter indicates 0.230 Vrms (this
is equivalent to 0.65 V p-p).
23. Disconnect the audio voltmeter and audio signal generator.
24. Connect a microphone intended for use with RT-9000C to front-panel MIC connector. Connect
an oscilloscope to test point 1A2A3 TP3.
25. Key the RT-9000C Transmitter from microphone and speak into it at a normal level. Adjust
potentiometer 1A2A3 R152 until 0.32 V p-p is indicated on the oscilloscope.
26. Disconnect all test equipment. This completes all receive and transmit audio level adjustments
27. Re-install card cage top cover and RT-9000C top cover.
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