Sort of following this thread as I use a sequencer+inhibit on VHF+ (with transverters and following amplifiers). With my sequencer delaying K3 RF for about 300ms there is no issue. QSK not used on CW (of course). My QRO coax relays would not like
But I am finishing my 300w HF amplifier kit and will be using a dc open-frame relay for TR switching of RF. I guess I can time it using my dual trace scope and set K3 TX DLY accordingly (amp will be keyed with KEYOUT). I do not use CW very much on HF so QSK with 300w is not necessary (or probably possible). I can always run the K3/10 in QRP-QSK, of course. There is one thing I do not see being addressed in this discussion. Maybe more important than clipping of CW characters is avoiding QRO "Hot Switching" of RF. Calculate the RF voltage for several thousand ohms impedance (open circuit) that will result if the amp is pumping out "globs" of RF before being connected to a good load. The relay contacts will definitely get burned big time. And maybe your output devices will have a short live-span. 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? DUBUS Magazine USA Rep [email protected] "Kits made by KL7UW" http://www.kl7uw.com/kits.htm ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
