It may be the delta in supply voltage on keydown slightly stimulating one or more relay coils. The DC shift could move the contacts a tiny bit. Or it might be an extremely small timing window, associated with T/R switching, that puts a little glitch on a relay control line. Either way it's nowhere near enough to change the state of a relay.
Nothing to worry about; in fact it might be therapeutic. But I'll listen for it myself. 73, Wayne N6KR > My K3 makes a very quiet relay-like keying noise.... --- http://www.elecraft.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html