I have run a TS-520 on PSK and MFSK. Diddeling with the mic gain does nothing. I used the ALC out of the rig to control the power. Here is my tune up procedure. SSB mode, tune the final stage for maximum output. Send a tone and adjust the power output by setting the ALC voltage from the 520. I normally tuned for 25W on an external meter. Max ALC voltage is -9V. I built a box, yes Altoids, with a 9V battery and a 10K linear taper pot. The pot MUST be linear taper. Then it's just proper wiring.
The point being you must tune the rig as if you were going to use SSB including setting the mic gain where you normally use it. Don't monkey with it. My PSK meter said I was doing -35dB. Lets see ya do that with a 12V final solid state rig. R. Kevin Stover AC0H ARRL, FISTS, SKCC, NAQCC. “If it doesn’t work the first time you push the button it won’t work the 20th…Just stop.” -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Martin Sole Sent: Sunday, July 22, 2018 8:06 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] TS520S and KPA500/KAT500 I might be way off here but from what I recall these older vacuum tube final amplifier radios have output that is variable in fixed carrier modes such as CW but which almost always produce full output in SSB. You might be able to reduce output by winding back the mic gain but it will likely sound a bit "thin" and any loud noises over an above nominal speech will produce more output. When you set the carrier or drive control that only has an effect on the CW output, it doesn't set the SSB output. I recall a common way to limit the output of these radios in SSB mode was to feed a dc voltage into the external ALC input of the rig in order to have it reduce power. Martin, HS0ZED On 22/07/2018 08:59, Nr4c wrote: > I want to use a Kenwood 520S with my KPA500 amp. I have the cable from the > 520 Remote connector to amp PTT IN. > > I assume I should tune up radio with dummy load and then turn Drive down low > and switch amp to Operate. Now turn up drive to get desire amp output. > > Now I ask, “What have I forgotten (or never knew about tube radios))?” > Anything else I need to pay attention to or what am I missing? > > Sent from my iPhone > ...nr4c. bill > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > hs0...@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to ksto...@ac0h.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
