Marcin, Now that you know where to look for the origin of the problem, I am confident you will correct it. Stray RF does many strange and unexpected things.
73, Don W3FPR > -----Original Message----- > > Don, > > Yes, yes, you are right! - it is caused by stray RF. > > I attached counterpoise wire cut for a quarterwave on 17 meters and it > resolve the problem. > Now, with your help, I'm sure that my K2 and KAT100/KPA100 are OK and > my problem is antenna. So, I must go to the roof, recheck antenna > connections and realign it. > Thank you again for your help! > > 73, > > Marcin SQ2AF > > K2 #5408 > > > > 2006/9/8, Don Wilhelm <[EMAIL PROTECTED]>: > > Marcin, > > > > I checked the RigExpert specifications, and while they claim > isolation on > > the soundcard connections, they do not make any such claims for > the digital > > connections (to the PTT, CW Key, or AUX I/O). > > > > So you still may have a problem with RF getting onto the > RigExpert or the > > computer chassis ground that is being then transmitted into the K2. > > > > This is not a problem with your connections, but it may be a > problem with > > the RigExpert on your K2 in combination with your antenna > situation. I am > > not yet convinced that it is a KPA100 problem. > > > > If you can test it with the KPA100 working into a dummy load, > that would be > > of interest, but it may be hard to detect if your receive is > desensitized > > with the dummy load connected. > > > > If you do not have the K2 mic jack shell grounded, you could > try doing that > > as a first measure of defense. > > > > The other thing you can try is attaching a counterpoise wire cut for a > > quarterwave on 17 meters to the KAT100 ground. The far end may > carry a high > > RF voltage, so keep it clear of human and pet contact (the far > end connects > > to nothing - just an insulator). If a counterpoise wire corrects the > > problem then you can be certain it is caused by stray RF - > unfortunately, if > > it does not cure it, stray RF could still be the problem, but > it is worth a > > try - a piece of wire an electrical quarterwavelength on 17 meters is > > approximately 3.9 meters long. > > > > 73, > > Don W3FPR > _______________________________________________ Elecraft mailing list Post to: [email protected] 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
