Emory, I've relied upon the power cable for grounding without giving a separate wire or strap any thought. Today sometime I'm going to run a ground strap between the K3 and PowerWerx to see if that helps. Thanks for sharing your experience and thanks for the suggestion.
I'm not sure why I didn't think of that myself. It's just that I never think of a power supply in terms of station grounding. 73, Marc W8SDG > On Jun 17, 2015, at 7:45 AM, <[email protected]> <[email protected]> wrote: > > Marc, > I have two of those power supplies, both without the meter. I did have RFI > from one of them when I had power for a keyer connected to the front power > pole connectors, disconnecting it, RFI went away. I also had a problem with > RF getting into the transmit signal. When I connected station ground to the > power supply that went away, I think it was a ground loop. With these > changes I now have no RFI from either one. > Hope this helps. 73 > Emory WM3M > > -----Original Message----- From: Marc Veeneman > Sent: Wednesday, June 17, 2015 6:34 AM > To: Fred Townsend > Cc: Elecraft Reflector > Subject: Re: [Elecraft] k3 switching supply > > Fred, you could be right about the meters being the problem. There are times > when the birdies will be quite stable, and other times when the move > completely across the P3 (or PX3) 40 kHz display in a dozen or so seconds. At > this moment they are stable but the meter reads a, also stable, 1.9 amps at > 14.0 volts. > > I’ll keep an eye on that. > > I bought directly from PowerWerx but my e-mail to them about the problem went > unanswered. Maybe a phone call is in order — and I think I’d like them to > substitute the meterless version. > > I wish I had your foresight. Instead I relied on the reviews I could find on > the Internet. :-) > — > Marc W8SDG > >> On Jun 17, 2015, at 3:02 AM, Fred Townsend <[email protected]> wrote: >> >> Marc I do RFI for a living. When I purchased my PowerWerx I made sure it was >> returnable if I found noise on it. I checked and found everything was well >> below published specifications so I retained the supply and have very >> successfully used it in the Sierras where there is virtually no man made >> noise which makes it sheer joy to operate. This unit was purchased before >> the model with LED displays was even available. >> >> Back in the days where commercial transmitters had scores of meters it was >> standard practice to shield those meters so RF would not leak out of the >> transmitter cabinet. I traced a problem in one HP unit to an unshielded LCD >> display. I suspect it may be the LED display itself in your PowerWerx that >> is causing your RFI. Personally I do not see the need of the meters when I >> can read the voltage on the K3 itself. After all it is the voltage at the K3 >> that counts. Not the voltage at the power supply. >> >> 73, Fred, AE6QL >> >> -----Original Message----- >> From: Elecraft [mailto:[email protected]] On Behalf Of Marc >> Veenemanno made >> Sent: Tuesday, June 16, 2015 3:26 AM >> To: [email protected] >> Cc: NE9U - Jasper >> Subject: Re: [Elecraft] k3 switching supply >> >> Mine is 6 months old, the version with the LED display, and the moving >> birdies on 80 and 75 meters are so strong and so annoying that I turn the >> supply off and operate from batteries if I operate for only an hour or so. >> I’m sorry I bought the PowerWerx even though it is good looking and a nice >> size for my small operating desk. >> >> Apparently their quality control is a variable, just like my birdies. >> — >> Marc W8SDG >> >>>> On 6/16/2015 1:22 AM, NE9U - Jasper wrote: >>>> I was about to order a switching supply for portable/dxpedition use and >>>> thought the one on elecraft site must be a good one, but i see it is >>>> getting poor reviews on eham.net for RFI/noise generation issues. >>>> >>>> anyone have suggestions for a good quiet k3 switching supply? >>>> >>>> scott ne9u >>>> >>>> >> >> ______________________________________________________________ >> 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] ______________________________________________________________ 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]
