Another video of adjusting the 9 MHz carrier osc for the best response between LSB and USB. I used "standard" markers of 300 Hz and 2400 Hz for the 2100 Hz passband, but these filters look more like 400 Hz to 2500 Hz. After the video, I walked this in even better so each filter looks identical. When zero beating a AM station it sounds the same in either sideband. These filters seem to be matched pretty well. Since this all done at audio, it is not exactly like looking at the IF, so I'm just shooting for a good balance of bandwidth between the filters while adjusting C130.
Drake TR-4CW Carrier Osc Adjust C130
Another video of adjusting the 9 MHz carrier osc for the best response between LSB and USB. I used "standard" markers of 300 Hz and 2400 Hz for the 2100 Hz passband, but these filters look more like 400 Hz to 2500 Hz. After the video, I walked this in even better so each filter looks identical. When zero beating a AM station it sounds the same in either sideband. These filters seem to be matched pretty well. Since this all done at audio, it is not exactly like looking at the IF, so I'm just shooting for a good balance of bandwidth between the filters while adjusting C130.
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