Don, Excellent advice! While I have a little bit of voltage drop, will run a parallel set of leads directly to my battery charged by my PowerGate PG40 s directly rather than through the rigrunner. Connection resistance was removed years ago but your suggestion cuts out two connectors. I like that a lot. Why didn't I think of that????
73, Bill K9YEQ ----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Don Wilhelm Sent: Thursday, March 9, 2017 7:24 PM To: James Bennett <[email protected]>; Elecraft Reflector Reflector <[email protected]> Subject: Re: [Elecraft] K3 Power Supply Question Jim, Get your DMM out and make the same measurement at the power supply terminals. If you see a substantial voltage sag during transmit there, you can blame the power supply. But if the voltage stays close to constant, the problem is voltage drop in the power cabling. The RigRunner will contribute some drop due to the extra contact points and even #12 or #10 wire has some resistance. If the power supply is good, run a power cable direct from the power supply to the K3 and run another power cable to the rigrunner. Run the accessories in the shack from the rigrunner. 73, Don W3FPR On 3/9/2017 8:09 PM, James Bennett wrote: > Hi All - > > Haven’t had any issues with the above configuration. Until today, when I > happened to punch the K3 DISP button, changing it from reading my VFO B > frequency to the other various bits of information. One of them was the rig > voltage. Sitting there on 17 meters in CW mode receive it was showing a nice > 13.8V. Cool. I hit the key and - wait a minute…… it dropped way down to > 12.4v. Huh - not so cool. My first thought was that the Boost Regulator was > not doing it’s job. But I decided to start trouble shooring at ground zero - > the MFJ 4245. I disconnected it from the Power Gate and ran it directly to > the K3. Key up = 13.8V. Key down = 12.0V. Yikes! I think (IMHO) calling this > poor regulation (15%) would be a gross understatement. > ______________________________________________________________ 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]
