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Er...it's late, and maybe my thinking is a bit muddled, but: it sounds
to me like you need to get the oscillator freq LOWER than it is now going. The earlier follow-on posts seem to be discussing ways to get the oscillator freq HIGHER - unwanted extra capacitors, inability to loosen the trimmer sufficiently, wrong slugs (which you don't have), etc. In my muddled little mind, it seems you need MORE capacity and/or coil inductance to get the oscillator freq LOWER, i.e. the oscillator needs to be at 7.0 MHz + 455 KHz = 7.455 MHz rather than 7.5 MHz + 455 KHz = 7.955 MHz as you now have it. So, is there a chance that there is supposed to be a little fixed ceramic or mica capacitor in parallel with the adjustable trimmer cap across the oscillator coil that is open, broken, or missing? Again, you need to get the oscillator freq LOWER, not higher, don't you? Okay, so broken is the same as open; I said it's late! Good luck! Ed Greeley Skyrider wrote: I am having a problem aligning an S 20R. The receiver has just been re-capped, however the problem I have been having was present before the set was touched. (The set just has much better sensitivity and the transformer runs cooler now). The problem I have been having is this: When I try to align on band 3 (the only band which gives problems) the closest I can bring it to proper alignment puts 7 Mhz at around 7.5 or so on the dial, and 10 MHz at about 12 Mhz on the dial. I cannot bring the dial tracking any closer than this. The other bands seem OK. I have checked the wiring against a parts receiver and do not see any problems. I verified that the oscillator is 455kHz above the received frequency by checking a known working S 20R (which I have owned for 36 years). There does not appear to be any problem with the trimmer/padder caps or the coil. Any ideas??? |
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