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Everyone. I fixed the VFO. Its a good news/bad news thing.
Apparently my MPF102, the heart of the VFO, was either shorted out or not working. I removed it and replaced it with another. Good news..Cool! Now I have a good VFO in my receiver, I can hear it in my trusty DX-398. I adjust the RF coil so its low end (with maximum capacitance on my Hammerland 1-10pF variable capacitor-fully meshed) is around 7.00mHz. When I go to minimum capacitance (no meshed), I hear it only around 7.060mHz. According to specs, I should get a range from 7.00 to 7.2mHz. Why do I not get more range? As far as I know, all caps are up to spec as called for. Do I need to add/subtract capacitance somewhere? Thanks again, Tom |
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