I have received a suggestion from Don Wilhelm to install an RFC from the Rx port to ground, and this solved the problem.
Many thanks to Don for his advice and prompt response. Bill Stewart, WU0R _____ From: William Stewart [mailto:[EMAIL PROTECTED] Sent: Saturday, January 28, 2006 5:33 PM To: '[email protected]' Subject: Amplifier T/R Keying problem I have a problem trying to key a "homebrew" amplifier with my K2 (S/N 5251). I am using the two-transistor T/R circuit from the "Mods" web page, and the T/R relay pulls in as expected, however there is an annoying "thump" in the received audio when the T/R returns to the receive state. I am using the separate receive antenna (Rx) input. If I disconnect the receive antenna line from the amp, there is no thump. If I trigger the T/R relay driver circuit manually, there is no thump. It seems that there is some interaction between the receiver unmuting and the T/R relay going to the "receive" state simultaneously that causes this thump. Any experience or ideas? Thanks, Bill Stewart WU0R _______________________________________________ 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
