Buzz: Our KAT500 and KPA1500 antenna tuners interrupt the key line with a relay for ATU tuning (which is done at exciter power, as we can’t hot switch ATU relays at QRO and amps don’t deal well with the SWR swings encountered during ATU tune). The K3, like most exciters, does pull down the KEY PTT line just before transmitting RF; we just keep that from reaching the amp. This technique works with a lot of exciters, without a need to modify them to emit RF without pulling down the KEY line.
Our KPA1500 ATU tune button interrupts the amp key line, (putting the PA in standby temporarily) and can be configured to send a message to K3 or K4 to start tune level RF. When ATU tune is complete, the amp sends a message to the exciter to cease sending RF, and after RF level drops, the amp restores the key line interrupt relay. 73 de Dick, K6KR > On May 30, 2021, at 07:32, James Beitchman <[email protected]> wrote: > > I think the answer is no, but I'll ask this question anyway. > > > > The station configuration is K3 followed by amp followed by automatic > antenna coupler, where the Key Out line of the K3 is used to switch the amp > inline. > > > > I would like to generate RF from the K3 without switching the amp inline in > order to operate the automatic antenna coupler at low power from the K3 > before putting the amp inline. This mean generating RF from the K3 without > activating the Key Out line. Is there any way to do that using K3 controls? > > > > 73, > > > > Buzz > > W3EMD > > > > > > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > ______________________________________________________________ > 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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
