Mike, I have a K3/KPA-500/KAT-500 and also have an amplifier following the internal 2-meter transverter. Rather than a non-linear "brick," I have the 80/100 W linear amplifier described in the QST article by W6PQL (May 2013 - Build a Linear 2 Meter 80 W All Mode Amplifier), but the issues are the same.
My solution is to tie the key lines in parallel and turn off the power to the one I am not using. If I forget, they both key, but nothing happens to the one without drive, as Don notes. I have been doing this for some years without issue. Joel Hallas, W1ZR ------------------------------ Message: 23 Date: Wed, 29 May 2019 10:32:19 -0400 From: Don Wilhelm <[email protected]> To: Mike Sanders <[email protected]>, Elecraft Reflector <[email protected]> Subject: Re: [Elecraft] K3, KPA500, KAT500 and 2M brick amp keying Message-ID: <[email protected]> Content-Type: text/plain; charset=utf-8; format=flowed Mike, The real answer to your question is - do you have a problem with the KPA500 and your 2M brick amplifier being keyed at the same time? There should be no RF input to the KPA500 when on 2M, and when on HF+6M there should be no RF input to your 2M amplifier. So, are you OK with keying both amplifiers all the time no matter which band is selected? If so, then just connect the KEYOUT line to your 2M amp and make no changes to the connection to the KAT500/KPA500. OTOH, if you do not wish to key both amplifiers all the time, you will need to use the Keyline interrupter and cable the KeyOut from the K3 to some sort of switching arrangement (could be manual or automated through a band decoding device) so the K3 KEYOUT line is routed to the 2M amp when 2M is selected and to the KAT500/KPA500 when 2M is NOT selected. The decision depends on your desires. Do NOT use both the AUX cable without the keyline interrupter and the RCA keyline connections to the KAT500/KPA500 - strange things can occur. 73, Don W3FPR On 5/29/2019 9:10 AM, Mike Sanders wrote: > I have a K3 with built in 2M transverter. The K3 drives the KPA500 and > KAT500 with the KPAK3AUX. Everything works > > fine. I do not have the key line interrupter installed. Reading notes 5 > and 6 on the KPAK3AUX I am a bit confused. > > I want to key a 2M brick amplifier with the key out line on the K3. Can > this be done without the key line interrupter in place? > > Or is the interrupter necessary to do this. ------------------------------ _______________________________________________ Elecraft mailing list Post to: [email protected] http://mailman.qth.net/mailman/listinfo/elecraft You must be a subscriber to post. Elecraft web page: http://www.elecraft.com End of Elecraft Digest, Vol 181, Issue 48 ***************************************** ______________________________________________________________ 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
