[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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