It may NOT be a good idea to gate the KEY_OUT with the foot switch because of timing issues. If you release the foot switch while transmitting, the amplifier relay, especially a fast QSK relay, could release before the K3 RF output decays, resulting in hot-switching of the relay. KEY_OUT apparently does not have that problem, or there would be lots of fried relays out there, not to mention key clicks. I suppose you could add a delay to the foot-switch release gating, if you really thought it was worth the trouble.
The only way to properly gate KEY_OUT to be inactive in PTT RX mode is to do it internally to the K3. As I said earlier, that is clearly not practical. It's not the way I would have done it, but it's a minor thing. In any design, trade-offs have to be made. 73, Scott K9MA **** On Fri, 11 Mar 2011 20:51:00 -0500 Don Wilhelm <[email protected]> wrote: ..... > > So that is why KEY OUT is activated when the key is operated. If that > does not suit your station setup, and you operate with a footswitch for > PTT, then it is an easy matter to use a relay (which is activated with > your footswitch) and connect the NO contacts in series the K3 KEY OUT line. > ______________________________________________________________ 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
