Did you "seat" the band pass filter trimmer caps, Rich? Many of those trimmer capacitors come from the factory needing to be twirled around a number of times to "seat" them so the sliding contact has electrical continuity. Just put your screwdriver in the slot and twirl it around a bunch of times, then re-try the alignment procedure. That CAN happen after the rig has been successfully aligned once. Apparently the contacts need a little 'exercising' to make them seat completely. Once that is done, they are fine. There's nothing wrong with the trimmers.
That's the most common reason for a dead band, right up there with perhaps a dreaded PTTL (poorly-tinned-toroid-lead). Normally a PTTL won't make the rig quit though. It won't work from the first. If you didn't get ALL the enamel burned/scraped off of a toroid lead or you pulled the lead through the board passed the tinned segment so enamel-covered wire was in the hole, you might not be making electrical contact on that lead. Leads that aren't tinned properly look fine when soldered unless you look VERY closely at the wire. You'll often see a tiny ring of dark that looks like rosin around the conductor. It's actually the enamel. In that case the wire is "trapped" in the solder blob and won't pull out, but it isn't making electrical contact either. Ron AC7AC -----Original Message----- I just noticed that my K2 build 43xx is almost totally dead on 20 meters. I think all the other bands are OK. I hooked up my N-Gen and could not hear anything on 20. I thought I could use a scope to follow the generators noise signal but the scope makes about as much noise as the generator when going through the bandpass circuit. I am guessing it is probably bandpass or low pass and I need to start checking to make sure the relays are making contact, etc.?? It worked when I built it a couple months ago and am not sure when it quit as I dont use 20 often. This K2 is totally optioned and I have removed the 100 watt PA to make sure it is not the culprit. Any comments on the best way to trouble shoot this? Thanks and 73, Rich kd0zv _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
