[BVARC] QRM in new radio setup
jcluppens at ussailing.net
jcluppens at ussailing.net
Sun Feb 7 13:36:19 CST 2021
Jeff Hoke was in the process of retiring and I believe he is no longer there. He was training his replacement though, his name is Gregory Young.
Gregory.young at centerpointenergy.com <mailto:Gregory.young at centerpointenergy.com>
Office: 713-945-6555
Mobil: 832-715-0549
If you can get him to come out he has all the same equipment and can run a spectrum analysis that could possibly help.
Hope that helps.
Chris Luppens
From: BVARC <bvarc-bounces at bvarc.org> On Behalf Of Jeffrey Carson via BVARC
Sent: Sunday, February 7, 2021 8:49 AM
To: BRAZOS VALLEY AMATEUR RADIO CLUB <bvarc at bvarc.org>
Cc: Jeffrey Carson <jcarson222 at yahoo.com>; Mark Brantana <mark.brantana at gmail.com>
Subject: Re: [BVARC] QRM in new radio setup
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 Hoke
jeff.hoke at centerpointenergy.com <mailto:jeff.hoke at centerpointenergy.com>
Office: 713-945-6304
Mobile: 713-304-2728
On Saturday, February 6, 2021, 11:37:44 PM CST, Mark Brantana via BVARC <bvarc at bvarc.org <mailto:bvarc at bvarc.org> > 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.
Mark
N5PRD
On Feb 3, 2021, at 6:55 PM, Gus Bernard via BVARC <bvarc at bvarc.org <mailto:bvarc at bvarc.org> > 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 <bvarc at bvarc.org <mailto: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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