If the 'noisy' line is an HV one, I would terminate my beverage well short of
20 feet. My north beverage picks ups pwr line noise when the wx is rain,
drizzle, snow, foggy, misty... It ends about 80 feet short of 11KV lines. I
would not dare go any closer than that, not because of the noise but because of
the safety aspect.
I have four EWEs about 200 feet from the pwr lines and they are generally)
clear of noise from the pwr lines.
73,
Ian G4IIY
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Greg - ZL3IX
Sent: 08 February 2019 18:46
To: topband@contesting.com
Subject: Re: Topband: BOG near noisy powerline on 160
If I were in your situation I would go for the smaller antenna further
away from the line. I would then take a sample of noise from the line
using an antenna right under it and use the sample to try and cancel out
some of the noise on the Rx antenna, à la WA1ION. See here
http://www.pa4tim.nl/wp-content/uploads/2011/02/passive_bb_phasing.pdf
73, Greg, ZL3IX
On 2019-02-09 05:31 a.m., N4ZR wrote:
> Recently I put down a 220' BOG, using the KD9SV hardware, including
> the preamp. Because of my yard's layout, the forward end of the BOG
> fell within about 20 feet of what the power company has identified
> (but not fixed yet), a noisy line with a number of broken insulators.
>
> I came in to listen to the antenna, and was surprised to note that my
> noise (mostly from the powerline, by ear) is worse on the BOG than on
> my jury-rigged sloper transmit antenna. It is much (maybe 20 dB)
> worse in the direction toward the power line than in the opposite.
> While I take this as encouraging evidence that the BOG has some
> directivity, I don't think I'm even hearing any atmospheric noise that
> may be present, because of the power line.
>
> So now I'm wondering, is the BOG in this position worth keeping, even
> assuming that I can eventually get the power company to fix the line.
> Or should I look at another type of receiving antenna, such as a K9AY
> loop or SAL, which can be placed much farther from the power line?
>
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