> I've also advocated to Elecraft in the past to make available RF delay > settings below 8 ms for those of us who have fast QSK amplifier switching > using vacuum relays or switching diodes. (My homebrew 6m amplifier T-R > speed is well under 4 ms, for example. The new Elecraft amp, I assume, > will be > even faster.)
I believe the larger issue is keeping good oscillator stability (to prevent transmitter chirp) between T/R and R/T transitions. That's a reason why Elecraft has not immediately implemented RIT in the K3 while in QRQ mode. Folks with a KRX3 can get around the RIT issue with the second Rx. Even when the K3 does have RIT in QRQ mode, I believe Wayne indicated that the frequency delta will be quite restricted for this reason. In the Ten Tec Omni Six series, CW chirp gets worse as the frequency delta between the Tx and Rx increases. It can get pretty bad with RIT/XIT excursions nearing 10 kHz. Most folks would not use RIT/XIT with such a large offset and this effect mostly goes unnoticed. In the Omni V, T/R times are actually slowed down a bit with larger VFO A/B split excursions (no RIT/XIT in the V model) and chirp is non-existent. I bring up the Ten Tec examples because the K3 is not immune from the same oscillator settling effects. There's a definite trade-off between T/R switch times and oscillator settling time when using a common oscillator for Tx and Rx Paul, W9AC ______________________________________________________________ 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
