I had the same issue with homemade SS amp on 6m band... the noise, flat uniform broadband white noise, was coming from no name chinese power supply. The main one ( brandname 50V/50A) was no problem, but this one ( used for service voltages and CPU ) was generating RFI and its wires were right next to the SWR bridge. The noise was getting into the receiver and raised noise floor 5-6dB. No issue on HF, but 6m suffered really bad.
K2BB On Sat, Dec 14, 2019 at 16:45 K9MA <[email protected]> wrote: > I guess it just shows how little I've been on 10, but I've had the > KPA1500 for over a year now, and I just noticed that when I turn it on, > my noise floor on 10 goes up about 3 dB. (And that's from an urban noise > floor.) It's pretty flat over much of the band, not typical switching > supply noise. Has anyone else experienced this and found a cure? (Other > than using the old amp tube.) > > 73, > > Scott K9MA > > -- > Scott K9MA > > [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]
