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
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