Second that. I have one external power supply from a well-known ham-gear manufacturer of somewhat questionable repute which throws off S9 racket all over everything, or did until I gave the output cord about 10 turns through a hefty ferrite.
I'd forgotten about the RX Shift feature being per-band somehow... it could be my imagination but it seems to take down the omnipresent 30Hz impulse noise a few dB at my QTH in San Mateo. (I've of course gone through turning off power to the house and driving around in portable operation... I think the problem is generally being anywhere near PG&E transmission lines, which is something that's hard to avoid anywhere in the SF peninsula. The noise blanker also does a pretty decent job of suppressing it even further.) Nick On 3 June 2018 at 10:45, Mel Farrer via Elecraft <elecraft@mailman.qth.net> wrote: > Wayne, > You missed one. Depending on operation whether it is internal battery or > external supply. I have had problems with a lot of external source, so > always put a dummy load on the antenna a see if the noise is conducted or > radiated. Just one more reason to go solar/battery in the field. Yummmm. > Mel, K6KBE with KX3 is all applications > > From: Wayne Burdick <n...@elecraft.com> > To: Mike Parkes <mspma...@gmail.com> > Cc: elecraft@mailman.qth.net > Sent: Sunday, June 3, 2018 10:15 AM > Subject: Re: [Elecraft] Intermod filter for the KX3 > > Mike, > > What you’re describing sounds like noise that is in-band and would be > debilitating for any radio. Not intermod. But just to be sure, set MENU:RX > SHFT to 8.0 and turn off the noise blanker. This is the most resilient > setup if you have monster signals actually causing IMD. > > Also try turning off the preamp. > > If the above steps don’t help, you could simply have a case of very high > noise floor. Here are a few more things you can try: > > 1. Use very narrow filter bandwidths. In CW mode, use the APF feature > (audio peaking filter). > > 2. Move the antenna farther from identified noise sources. > > 3. Try a magnetic loop. These are very narrow banded, and may have > directional characteristics you can make use of. > > If all else fails, try taking your KX3 portable as an experiment. A > location far from massive noise sources can be a breath of fresh air, both > atmospherically and ion-ically. It’s not a long-term solution unless, like > me, you discover that field operation is a blast. But it’ll give you some > perspective about your noise at home. > > 73, > Wayne > N6KR > > > > > > ---- > http://www.elecraft.com > > > On Jun 3, 2018, at 9:49 AM, Mike Parkes <mspma...@gmail.com> wrote: > > > > Hey group > > I have an issue here and am wondering if a good band pass filter would > > help? I pick up so much sqawks and buzzing weird interference, grating > > machine sounds, on my KX3 on all HF bands, it is horrible in my setting > > (ground floor apartment in the city). I have the same issues on 2 meter > > handhelds, noise all over the band, trips the squelch making it nigh > > impossible to scan without the radio stopping on some ghost signal that > is > > only intermod. Same story with the KX3 2 mtr module though I can turn the > > squelch up enough to keep the radio scanning without stopping on noise > for > > the most part. Is there any hope for HF? Would some sort of HF band pass > > filter help my KX3? Or is the filtering in the KX3 already good enough? I > > can't make it go away with the built in KX3 noise filters. There is this > > one company across the street from me, some internet megalith place with > > sat dishes on the roof and I wonder if some of the noise is coming from > > that establishment. Anyway... thanks for any ideas... head for a park, a > > mountain peak... I know... :) > > > > 73's Mike AB7RU DN17gp > > ______________________________________________________________ > > 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 n...@elecraft.com > ______________________________________________________________ > 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 farrerfo...@yahoo.com > > > ______________________________________________________________ > 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 n...@n6ol.us > -- *N6OL* Saying something doesn't make it true. Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting. ______________________________________________________________ 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
