[BVARC] QRM in new radio setup
Gus Bernard
gnelnard at gmail.com
Wed Feb 3 18:55:39 CST 2021
What Rick says. Then try taking it portable, away from the QTH and power
lines.
Gus, K5GMB
On Sun, Jan 31, 2021 at 7:33 PM Mark Brantana via BVARC <bvarc at bvarc.org>
wrote:
> I am reaching out for ideas on a radio issue. I have installed an IC-745
> Icom with an MFJ-2010 offset fed dipole. The power supply is a 20A MegaWatt
> switching power supply, which is located right next to the radio. The
> antenna is under some high power-lines with the long leg 90 degrees to the
> power-lines. I used my nanoVNA to study the band SWR response, and
> everything looks reasonable, though some small adjustments may need to be
> made. Nothing is grounded as yet.
>
> Here’s my problem. I am only attempting to receive at this time and I get
> consistent QRM white noise across all bands to the point where I can barely
> pick out some voices, etc.
>
>
> - I am confident that the antenna is properly connected due to my
> antenna study.
> - I don’t believe the power lines are an issue, since the problem
> would likely be more isolated show up as birdies at certain frequencies.
> - The radio settings seem to all be correct according to the manual.
>
>
> - Lack of grounding, but again the white noise is generally consistant
> across the spectrum. Still, this could be the problem.
> - I have turned off my computer, so there no QRM from its power supply.
> - It does not help to have the switching power supply right next to
> the radio, but other users give good reports on this model and no QRM
> issues are mentioned.
> - I tried the radio at different times of the day on 20-m voice band,
> with the same noisy result.
> - It could be the net result of a large number of small device
> transformers, but I doubt it.
> - I turned off the wifi, and still no change.
>
>
> Hmm… I am a little stumped. Any thoughts or ideas? Personal experiences?
>
> Mark
> N5PRD
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