My Radio Shack supply is entirely quiet, it is a classic straight-through design. No switching going on here. 72 Howard Kraus, K2UD
-----------------------------------------From: "Dan Presley" To: "K2" Cc: Sent: Friday October 8 2021 10:42:44PM Subject: Re: [Elecraft] Power supply for KX3 The Radio Shack supplies are abysmally noisy. Don’t go there…the Pro Audio is far superior. Dan Presley 503-701-3871 danpresley@me. com n7...@arrl.net > On Oct 8, 2021, at 17:49, Jim Brown wrote: > On 10/8/2021 4:14 PM, qr...@roadrunner.com wrote: >> The ubiquitous Radio Shack 22-124A (and its variants) power supply is >> a perfect match for the KX-3. Manufactured by the millions and cheaper >> than dirt on that watery place or under hamfest tables it meets the >> current-handling needs of the KX-3. > > I don't see comments on the elephant in the room -- most commercial power supplies dump out lots of RF noise, both from their switch-mode operation and their regulation circuitry. I would be VERY suspicious of any such unit not specifically marketed to hams for use on the HF bands. > > The ProAudioEng PSU is quiet for the low current needed for receive, but is noisy at the higher current of transmit. No problem if you're using only one radio at a time, but bad news if you're listening on a second radio tuned to another band while transmitting. It may be possible to quiet that noise with ferrite chokes. I have one of these PSUs, but haven't tried to choke it. > > 73, Jim K9YC > > > > > ______________________________________________________________ > 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 [1] > Please help support this email list: http://www.qsl.net/donate.html /> > Message delivered to n7...@arrl.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 [2] Please help support this email list: http://www.qsl.net/donate.html /> Message delivered to qr...@roadrunner.com Links: ------ [1] http://www.qsl.net [2] http://www.qsl.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