I do use voltage sensing at the rear of the radio. Astron supplies can be modified easily to do this - they already have sense wires tied to the voltage output terminals. Basically you disconnect them there and run leads (keep em short) to the radio. On transmit, my K3s drops less than 1/10 a volt.
There are a few write ups floating around on how to do this. I installed a switch (make before break type) on my RS-50M so I can return to "normal" sensing. ***WARNING*** If the external sense wires are not connected to anything the crowbar circuit will fire!!! Hank K4HYJ -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Karin Johnson Sent: Tuesday, December 24, 2019 3:20 PM To: elecraft@mailman.qth.net Subject: [Elecraft] K3 - Power cable voltage drop Why hasn't anyone used remote sensing at the radio voltage input? As far as I know all of the Astron supplies don't have external sense wiring. Many so called professional grade high current supplies provide For external connection of the voltage sense back to the regulator chip. I've toyed with this idea a bit but haven't had the time dig in to the Astron supply I have. If this were implemented then one could maintain 13.8 volts or whatever you desired at the radio power supply inputs, Regardless of the current draw. Karin Anne Johnson K3UU ______________________________________________________________ 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 h...@optilink.us ______________________________________________________________ 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
