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Re: [RFI] Powerline noise question

To: Frank W3LPL <donovanf@starpower.net>
Subject: Re: [RFI] Powerline noise question
From: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 30 Dec 2022 20:36:31 -0800
List-post: <mailto:rfi@contesting.com>
I am going to start with the preamp kit DXE sells to go with the flag kit. This particular noise source is extremely strong so I am optimistic that it will be sufficient. I can add the preamp that
came with my Pixel loop if necessary.

Again, your recommendation means a lot.

73
Rick N6RK

On 12/30/2022 5:08 PM, Frank W3LPL wrote:
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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