Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!
开云体育Emanuele I NEED EDUCATION ?on reading these new scopes and such Wrt your previous post; I have no reason to believe there is a problem in the IF. My last post made wrong assumptions on the reading the scope, so my conclusions are wrong; and I agree the RF tuning on the first tank in band 1? is way out it seems. I keep wondering why 4 tanks seem to have the same problem. ?Is it possible that the bandspread dial stringing is reversed? ? From: [email protected] [mailto:[email protected]] On Behalf Of Emanuele Girlando via groups.io
Sent: Thursday, February 6, 2025 4:25 AM To: [email protected] Subject: Re: [HallicraftersRadios] S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak! ? Don, here is my picture interpretation: ? Richard: ·?????? "So, what is this about .5Mhz and 370 and 220 Khz? ". Those are the delta values between peak and the desired frequency as reported by the Delta marker (rounded). ·?????? The IF alignment has been remade from scratch by using the "visual" approach (first 3 pictures). ·?????? "The position of the peaks on the RF will be affected somewhat by the dummy load". If you meant the "dummy antenna" I fully agree. I'm gonna try the same test removing the dummy antenna from the equation. I'll report as soon as I get time to work on that. Correction to my previous post: "...all signals (and the noise as well) tend to disappear below .5MHz" should read "... below 1MHz" that is in the lower half of the band. ? Thank you guys! Emanuele (IU1KNR). ? -- don??? va3drl |
don Root