Hello,i have had Jeff Hoke with Centerpoint come out and remediate some noise
on a pole behind my house. Very thorough and professional.
His contact information: Contact Jeff by email FIRST.Jeff
[email protected]
Office: 713-945-6304Mobile: 713-304-2728
On Saturday, February 6, 2021, 11:37:44 PM CST, Mark Brantana via BVARC
<[email protected]> wrote:
Tonight I hooked up my little TH-F6A to the same antenna and got the same
noise. I do have to test out my radio, but I am 85% convinced that it is QRM
from a pole transformer located about 25 ft from the long end of my OFDP. This
is a reasonably new transformer, since they replaced it about 5 years ago when
the old one blew. Anyone have experience with getting the electric company to
do a RFI survey?
On the down side, I carried my AM radio to my back yard and heard no detectable
interference. This is turning into a real mystery.
MarkN5PRD
On Feb 3, 2021, at 6:55 PM, Gus Bernard via BVARC <[email protected]> wrote:
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?
MarkN5PRD________________________________________________
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________________________________________________
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BVARC mailing list
[email protected]
http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
________________________________________________
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________________________________________________
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