The best antenna I have is a piece of wire about 30ft long with a 100pF cap on the end as mentioned in the article. I tried U1 pin 1, and get nothing. I suppose that would indicate a problem...but I'm not sure where.
Not much point in going backward, because anything behind that will certainly be stopped there. Any ideas? Randall -------------- Original message ---------------------- From: Tom Hammond <[EMAIL PROTECTED]> > Randall: > > >At best Ive been getting some quiet popping noises...I occasionally > >heard some hums, but I think that is some bleed-in from my work > >area, and not quite so much to do with something coming in from the antenna. > > > >I put the bottom cover back on to try and isolate it from the table > >and any frequencies coming through it, and the hum is gone, and I > >cant hear anything now. I think all the antenna was doing was > >bleeding out that errant signal. > > It was probably providing a VERY small amount of signal which was > able to sneak thru > the product detector and into the AF Amp. > > >Perhaps its time to introduce myself to some local hams and see if I > >can't get some help, and perhaps a signal gen. > > It NEVER hurts to get to know your 'locals'... sometimes you'll find > someone who is very > knowledgeable and quite willing to help a newbie. > > However... FIRST try using the techniques (and test points) in my > article. You first want to try to confirm that everything from the > Receive Mixer on thru the AF Amp is working. So try injecting an > off-the-air signal, even if it's only 40M noise, at U1 pin 1. IF you > hear noise in the speaker, then go to pin 1 of T1, and then to pins 8 > & 3 (in that order) of K1. > > Each time you CAN hear a signal, as long as it's relatively the same > (or higher) level as that which you heard from a prior injection > point, there's a good chance that things are still OK to that point. > You want to work your way from the INSIDE of the circuit out toward > the ANT input. If you find an injection point where the signal really > drops (or completely disappears) THAT's where you want to try to find > out why... the loss should be between THAT point and the last known good > point. > > This is quick and easy to do and may save you having to find someone > locally for help... though it's STILL good to get to know the locals. > > 73, > > Tom N0SS > _______________________________________________ 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
