Re: How and where do i check the filters
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Andrew,? Are you able to correctly adjust all of the Drive/Final Idling Currents?? For adjusting TX power output, using the correct mic audio level and frequency as specified in procedure is important.? What are you using to measure the idle currents?? What are the actual measured currents in the 4-4 Transmitter Adjustments, steps 2-7?
Are you able to verify the TX voltages by stage as given in :??/g/ic7000/files/7K%20TX%20RF%20Levels%203.pdf? ?? Make sure your radio settings match those in the first paragraphs.? It is important to have a ground spring clip on the probe's ground barrel (instead of a normal ground wire clip) to eliminate noise coupling and get accurate readings. Since all bands appear to have a problem, it is unlikely to be a problem with high or low pass filters or their switching diodes & relays.? But you can verify them by seeing that the input signal level is okay per the above document, then checking the signal level on the output of the filter.? The switching diodes and their control voltages are more likely to be a problem than the actual filter circuit. Steve, W3AHL |
Steve W3AHL