Rick,
You'll be very pleased with the performance of the WB8DSB RFI hunting
flag antenna.
Don't forget to need lots of preamp gain. The WB8DSB flag is about 60 dB
down from a dipole on 160 meters. 40 dB of preamp gain is needed until
you're very close to the RFI source.
73
Frank
W3LPL
----- Original Message -----
From: "Richard" <richard@karlquist.com>
To: "Frank W3LPL" <donovanf@starpower.net>, "rfi" <rfi@contesting.com>, "PVRC"
<pvrc@mailman.qth.net>, "topband" <topband@contesting.com>
Sent: Friday, December 30, 2022 8:25:47 PM
Subject: Re: [RFI] Powerline noise question
Thanks Frank. You got me unstuck.
I have ordered the DX Engineering Kits and the PL330 receiver.
73
Rick N6RK
On 12/29/2022 7:53 PM, Frank W3LPL wrote:
> Hi Rick,
>
> I recently built a WB8DSB man portable flag antenna (March 2021 QST)
> for RFI geolocation, its performance far exceeds my expectations.
> Its narrow deep null quickly, easily and definitively located the
> source of very troublesome 160 meter RFI to a single power pole
> more than three miles from my QTH. Prior to constructing the
> flag antenna I could locate the RFI to only within a few hundred
> yards of the RFI source.
>
> I built my flag antenna entirely out of materials I had on hand
> from previous projects including 3/8 inch diameter fiberglass rods,
> a pair of Advanced Receiver Research P1-30/20VD 20 dB HF preamps,
> a case of eight AA batteries to provide power to the preamps,
> a switchable attenuator and a Tecsun PL330 portable HF receiver.
>
> I highly recommend this easily constructed RFI geolocation antenna
> for the toolkit of any serious HF operator.
>
> 73
> Frank
> W3LPL
>
>
>
>
>
> ----- Original Message -----
> From: "Richard" <richard@karlquist.com>
> To: "rfi" <rfi@contesting.com>
> Sent: Friday, December 30, 2022 3:15:32 AM
> Subject: [RFI] Powerline noise question
>
> I have a powerline noise coming from about 2 miles away, which is
> nevertheless quite strong at my QTH.
>
> Here are the symptoms:
>
> 1. A 120 Hz noise burst at regular intervals, about 0.9 seconds apart.
>
> 2. The noise goes away after a rain; then comes back after things dry
> out.
>
> 3. Can be heard from 500 kHz up to a few MHz.
>
> 4. The noise is very strong along a road for a few miles. There is a
>
> power line that follows the road. I haven't been able to localize it
> better than
>
> that so far. From my QTH, though, it is definitely coming in at a
> specific azimuth
>
> which is consistent with the noisy road a few miles away. (Using a loop
> antenna
>
> for DF'ing).
>
> Any help appreciated.
>
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