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Re: LF: Dot and Dashes - PLC noise?

To: "[email protected]" <[email protected]>
Subject: Re: LF: Dot and Dashes - PLC noise?
From: Laurence KL7 L <[email protected]>
Date: Mon, 30 Mar 2015 18:04:02 -0800
In-reply-to: <[email protected]>
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Thanks John - my distribution locally within the area is underground with 
overhead out about 1/4 mile. One typo crept in out local supply down the roads 
is at 7.5 kilovolt...not Watts of course. If i run opds32 its very easy to see 
the daily repetition of what it is... Sort of a good thing in some way - i like 
to see the occasional spot or smpsu squirrly give me an idea that my s/n isnt 
too bad. If I get a clear Argo screen I get worried :-)

l.


> On Mar 30, 2015, at 4:07 PM, John Andrews <[email protected]> wrote:
> 
> 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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