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Re: LF: Dot and Dashes - PLC noise?

To: [email protected]
Subject: Re: LF: Dot and Dashes - PLC noise?
From: John Andrews <[email protected]>
Date: Mon, 30 Mar 2015 20:05:25 -0400
In-reply-to: <[email protected]>
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Laurence,

Interesting. The meters in this town (municipal power company) would not likely be the culprits, but the Worcester city line is about 1/2km away. That's National Grid territory, and they have begun using signalling meters.
John, W1TAG

On 3/30/2015 6:22 PM, Laurence KL7 L wrote:
We get these here too - most of the dots and dashes appear at repetitive
times every day - related to (mostly!) power meter "Turtles" in peoples
meters which inject signals back to the local substation across the
110/240/7.5Kw transformers - it used to be horrid at 137kHZ  - and I
managed to get the electrical utility to revert back a manual reading
meter at home-  and then installed a whole house RF filter ( 2 x 220A)
on incoming supply which helped a little more -

   I still get the interference but its a lot better, that and choking
the incoming Cable tv cable outside in the roadside podium with a large
"J" ferrite with 15T - that helped clear up a load of VLF noise too -
Cant fix the fenceless dog interference yet... :-(

Unless its Aliens again....

Laurence KL7L We2XPQ etc



 > Date: Mon, 30 Mar 2015 18:00:44 -0400
 > From: [email protected]
 > To: [email protected]
 > Subject: Re: LF: LF tonite
 >
 > Markus,
 >
 > > Wonder what the little dash below Stefan's "F" was... possibly
local QRM
 > > from some MFSK PLC system? We sometimes seem to find a number of
 > > unexplained scattered dashes on North American QRSS spectrograms.
 >
 > I watched the entire band for a while this afternoon, and homed in on
 > the 136.552 kHz frequency range below, after seeing some "dash"
 > activity. Interesting.
 >
 > John, W1TAG




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