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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