Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!
¿ªÔÆÌåÓýJacques,? maybe look at ¡°scope¡± sweeps in here and some in just after posts I think. I didn¡¯t get far, and misinterpreted scope face info.?? I have to copy then and add my own marks or I will get things wrong, so I did not get thru them, and ?I / we somehow went down another road [logging road] and got stuck, and it has rabbit holes too. ? In case you are looking, I think all images in this thread are pasted in, [not attachments] I¡¯m going to look at tank sweeps again . or whatever they are called these days. /g/HallicraftersRadios/message/31577 From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE via groups.io
Sent: Saturday, February 15, 2025 10:50 PM 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! ? Hi Don, I followed this case more or less since Emanuele posted it, so be kind if I misunderstood anything about. I remember that Emanuele complained about a complete loss of sensitivity in the lower part of the Bands 1 and 2: is it right ? Does somebody already asked him to check the amplitude of the Local Oscillator at the low end of those two bands ? My doubt is: this seems to be an alignment problem, but what will be the effect of a ¡°dying¡± LO on the low end of the BC band, for example ? That can happen if the Q of the oscillator coils is lower than they should be, or if the 6SA7 is end-of-life (not enough gain). ?
-- don??? va3drl |
don Root