02-27-2014, 10:07 AM
If you are trying to align the 455kHz IF, you must inject the signal directly into the mixer grid circuit. The coupling loop won't work because the antenna circuit rejects the 455 IF signal since it is outside the broadcast tuning range.
The best spot to inject the IF signal is into the ant section of the tuning cap through a coupling cap of .01 uF or so. Once you have the IF aligned with the direct connection, you can remove it and use the coupling loop to align the ant circuits on AM and SW.
Unless your generator is not working there should be plenty of signal received at AM and SW frequencies with the coupling loop. Have you tried it with any other radios?
Typically, you align the low freq osc padder at 600 kHz and the high freq osc trimmer at around 1400 kHz, then the ant trimmer at 1400 for max signal. The alignment procedure should give the recommended alignment freqs for your specific model.
The best spot to inject the IF signal is into the ant section of the tuning cap through a coupling cap of .01 uF or so. Once you have the IF aligned with the direct connection, you can remove it and use the coupling loop to align the ant circuits on AM and SW.
Unless your generator is not working there should be plenty of signal received at AM and SW frequencies with the coupling loop. Have you tried it with any other radios?
Typically, you align the low freq osc padder at 600 kHz and the high freq osc trimmer at around 1400 kHz, then the ant trimmer at 1400 for max signal. The alignment procedure should give the recommended alignment freqs for your specific model.
