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Tagged: Alignment Problem
I’ve recapped my Stewart Warner Grenadier R-403 and replaced an incorrect tube. It sounds great but it won’t tune any station lower than 600kHz.
It sounds to me ( no expert here mind you) that you have a local oscillator problem. Using another radio, the local oscillator should be 456 kilohertz above the received signal, (I think most of these are hi-side injection) . So you should be able to pick it up at 1056 on the am dial. Is there a missing or broken trimmer on the portion of the tuning cap for the oscillator, I wonder. preventing it from going lower in frequency. You would need to be down in the 990 kilohertz range.
Good luck with it.
So, I’ve resolved the problem. Somehow when I was adjusting the cap for the low frequency of the broadcast band my meter was indicating a peak that wasn’t from the signal of my generator. I don’t know if it was some sort of harmonic frequency or something else being picked up by the antenna. Once I figured that out I was able to successfully complete the alignment and the stations are tracking properly.
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