Please see comments below. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Vic K2VCO Sent: Saturday, September 03, 2011 11:51 AM To: [email protected] Subject: Re: [Elecraft] K3 with a Kenwood TL-922A
Actually, I believe that the K3's amp keying output could handle the +120v key line of the 922 with no trouble. My TL922 came with a diode across the t/r relay, by the way. BUT -- there is a much bigger problem with the TL-922. That is that the relay is very, very slow. You would probably have to increase the TX Delay of the K3 to prevent hot-switching, and increasing it beyond 12-15 ms messes up your keying. Buffers and soft-keys CANNOT fix this problem. Vic: Do you realize that placing a diode across the T/R relay slows it down? If you are going to quickly swing the relay you are better off to shunt the key line with a transient absorbing device like a transorb. As the name infers that's a zener that especially designed to absorb transients. That will speed the decay of the relay field rather than delaying it. The type transorb used must be selected to have a sustaining voltage greater than normal key line voltage. You want the transorb to only conduct during the transient period. 73 de Fred, AE6QL ______________________________________________________________ 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
