[BVARC] QRM in new radio setup

Jeffrey Carson jcarson222 at yahoo.com
Sun Feb 7 14:46:16 CST 2021


 That is very odd. I just worked with Jeff on my issue back in November 2020 and he told me to call him if i needed anything else. He was driving a CenterPoint van. He followed  up with a call in Mid December to make sure the work order he put in had been completed. Yes, it is free and he has the noise finding equipment and yagi's to find the problem. Finding interference is his job.
    On Sunday, February 7, 2021, 01:36:23 PM CST, <jcluppens at ussailing.net> wrote:  
 
 
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

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


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> 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> 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> 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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