[Elecraft] External linear amplifier with CW
Hi 'crafters, I perused the archives and found a little bit of information on the K2 having a high voltage keying transistor for keying an external amplifier. Use of 8R Hold for delay times? I need more help on how to do this for operating in CW only. I am accustomed to linears having key-in, key-out for QSK. This Tokyo Hy-Power amp has a fast t/r relay to put the amp into transmit mode, equivalent to PTT where I have used a foot switch to transmit. While a foot switch isn't bad, I'd rather use the K2 keying transistor to trigger the amp. Am I on the right track? Any ideas? 73, de Joe - aa4nn All email scanned by Norton Antivirus ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] External linear amplifier with CW
Joe - aa4nn wrote: Hi 'crafters, I perused the archives and found a little bit of information on the K2 having a high voltage keying transistor for keying an external amplifier. Use of 8R Hold for delay times? I need more help on how to do this for operating in CW only. I am accustomed to linears having key-in, key-out for QSK. This Tokyo Hy-Power amp has a fast t/r relay to put the amp into transmit mode, equivalent to PTT where I have used a foot switch to transmit. While a foot switch isn't bad, I'd rather use the K2 keying transistor to trigger the amp. Am I on the right track? Any ideas? You shouldn't have any trouble using the keying output of the k2/100, which is based on the 8r line. There is sufficient lead time to safely key QSK amps (I forget how much, but maybe 15 msec? -- someone who knows, please jump in). I have used it with homebrew vacuum relay QSK systems as well as an Alpha with PIN diode switching. You should not need the key-in/out setup. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] External linear amplifier with CW
Thanks for the tips. The K2 PA Keyout line to the Tokyo Hy-Power Send input works perfectly for putting the linear amp into transmit mode. I set the T-R delay to .75 for a good delay time when sending slow code. Thanks for all the replies. 73, Joe, aa4nn K2VCO Wrote: You shouldn't have any trouble using the keying output of the k2/100, which is based on the 8r line. There is sufficient lead time to safely key QSK amps (I forget how much, but maybe 15 msec? -- someone who knows, please jump in). I have used it with homebrew vacuum relay QSK systems as well as an Alpha with PIN diode switching. You should not need the key-in/out setup. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] External linear amplifier with CW
I have the circuit from the Elecraft web site. Unfortunately, my SB-220 won't really do QSK. Any ideas on how to modify the little perf board interface to put some (hopefully adjustable) delay in the release to simulate semi-QSK with VOX for the amp? 73, Fred K6DGW Auburn CA CM98lw Vic Rosenthal wrote: You shouldn't have any trouble using the keying output of the k2/100, which is based on the 8r line. There is sufficient lead time to safely key QSK amps (I forget how much, but maybe 15 msec? -- someone who knows, please jump in). I have used it with homebrew vacuum relay QSK systems as well as an Alpha with PIN diode switching. You should not need the key-in/out setup. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
