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 <[email protected]> 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 > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >
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