Won't he be surprised when it DOESN'T cure the problem; I just
tracked down a source I had on 160 meters that was 1.74 miles
(that's one point seven four miles) away. This was 'tracked' down
using a portable battery-operated marine DF receiver using a
bicycle as mode of transportation. Multiple DF readings were
taken on this source until I finally converged on the source.
Some of these sources can be quite some distance away, and any
nearby sources located may not be the one creating all the havoc
at the station QTH. I've had a couple of those, too. By using the
DF receiver I can take bearings some distance out from the
actual, final 'source' and feel quite confident I've located the
source that affected my station QTH. Also note, when I find
one of these sources a mile or more out, standing 30 feet away
from the actual source the noted signal strength is quite strong.
I make use of and note of the RF gain control setting on the DF
receiver too. As there is no AGC on these model marine DF receivers,
its necessary to 'wind back' the RF gain as one begins to converge
on the noise source. One gets a repeatable indication when locating
these sources and noting that the RF gain setting is near minimum
to keep the meter 'mid-range on scale' when one finally locates the
actual, physical RFI source.
de AA5CT Jim
On Monday, June 6, 2022, 7:15:24 PM GMT-5, Charles Plunk <af4o@twc.com>
wrote:
I snooped on your QTH. Nice remote area with single phase lines. I am
jealous :-).
73 Chuck W4NBO
On 6/6/22 18:21, Riki, K7NJ wrote:
> Thanks Ed and Charles,
>
> With all the great input from Ed, I now know the "lay of the land", i.e.
> what administrative tools and regulations apply.
>
> I've located two power poles that are likely sources. I drove around
> listening on my car radio to the noise in a clear channel in the AM
> broadcast band. When the noise peaked next to a power pole, I got out of the
> car and did some direction finding with a portable AM radio (that has the
> typical directional internal antenna). Next, I verified the findings using
> an MFJ-852 AC Power Line Noise meter. Everything was in agreement, so I made
> note of the pole identification number (from its metal ID label). I've
> already contacted the power company, and they've issued a work order number.
> They said that it might take a week or two, and if needed, I should call
> them back.
>
> Hopefully the problem will now be fixed, although there were many additional
> power poles that caused much lower noise on the car radio. But, this is a
> good starting point for now.
>
> 73, Riki K7NJ
>
> -----Original Message-----
> From: RFI [mailto:rfi-bounces+k7nj=awinets.com@contesting.com] On Behalf Of
> rfi-request@contesting.com
> Sent: Monday, June 06, 2022 5:28 AM
> To: rfi@contesting.com
> Subject: RFI Digest, Vol 233, Issue 3
>
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> Today's Topics:
>
> 1. Power Line Radiated Interference Limits (Riki, K7NJ)
> 2. Re: Power Line Radiated Interference Limits (Charles Plunk)
> 3. Re: Power Line Radiated Interference Limits (Charles Plunk)
> 4. Re: Power Line Radiated Interference Limits (Hare, Ed, W1RFI)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 5 Jun 2022 20:12:02 -0600
> From: "Riki, K7NJ" <k7nj@awinets.com>
> To: <rfi@contesting.com>
> Subject: [RFI] Power Line Radiated Interference Limits
> Message-ID: <000401d8794a$d01cf890$7056e9b0$@com>
> Content-Type: text/plain; charset="us-ascii"
>
> I've recently become plagued by power line interference that is most
> noticeable on 80M and 160M. In the past,, the local power company had been
> cooperative in fixing the source(s) of such interference. However it's been
> about 7 or 8 years since I've been in touch with them about such issues.
> Just to be prepared, I would like to know what specific limits there are on
> power line emissions (if any). I know that in the past, the requirements
> were very lenient - only requiring power companies to follow good
> engineering practice without any quantitative emission limits. In any case,
> having the actual reference paragraph numbers in the FCC rules would be most
> helpful. As I recall, this had been somewhere in Part 15. Any help would be
> appreciated.
>
> 73, Riki K7NJ
>
>
>
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