[Lowfer] [EXTERNAL] Strange QRM here on SAQ frequency

[Bill de Carle]

Hi Jay:
I widened up the CW filter to include the six visible spectral lines 
- audio clip here:

http://www.magma.ca/~ve2iq/saq_qrm.wav

This morning I shut off the main breaker at the distribution box and 
turned off the UPS units in the radio room - no change at all to the QRM.
It could be related to our "smart meter" - but I thought it 
transmitted on UHF.  Must have a power source though :-)
73,
Bill VE2IQ

>Bill
>
>Can you send a short audio clip?
>
>Jay W1VD
>
>
>----- Original Message ----- From: "Bill de Carle" <ve2iq at magma.ca>
>To: "Discussion of the Lowfer (US, European, &UK) and MedFer 
>bands" <lowfer at mailman.qth.net>
>Sent: Tuesday, July 01, 2014 11:45 PM
>Subject: Re: [Lowfer] [EXTERNAL] Strange QRM here on SAQ frequency
>
>
>>Thanks Laurence.  No cable TV in this area but I guess the 
>>interfering signal could be from some kind of switching supply.  I 
>>have difficulty with the narrow emission bandwidth and the observed 
>>frequency stability.  Local phone company runs DSL here over some 
>>distance so they must have repeaters.  Strange how the signal 
>>disappears completely from time to time like equipment was switched off.
>>73,
>>Bill VE2IQ
>>At 08:58 PM 7/1/2014, Laurence KL7L wrote:
>>>Looks like switched mode- get the same from cable company head end 
>>>amp power supplies in road side cabs - comes and goes
>>>
>>>Laurence kl7l
>>>
>>> > On Jul 1, 2014, at 4:45 PM, "Bill de Carle" <ve2iq at magma.ca> wrote:
>>> >
>>> > Hi Everyone:
>>> >
>>> > Anyone on this reflector know what could cause some very strong QRM I
>>> > see right on top of SAQ's 17.2 Khz frequency?  It consists of a group
>>> > of spectral lines spaced 120-Hz apart, centered near 17.2 Khz but
>>> > occupying only about 1 KHz bandwidth.  This QRM is present most of
>>> > the time at my QTH but oddly enough, it wasn't there on Sunday
>>> > morning when I got up around 4:30 am Eastern time.  Obviously it's
>>> > powerline-related, but as far as I know (famous last words!) it
>>> > doesn't seem to be coming from anything in my home.  I can even
>>> > disconnect the mains & run on batteries: the signal does not change,
>>> > so it is clearly radiated, not conducted through the power line.  The
>>> > amplitudes of the individual spectral lines vary slowly (cycling over
>>> > perhaps 20 seconds), seemingly at random.  I live in a rural
>>> > neighborhood and there are some electric fences around.  What bugs me
>>> > is why at 17.2 Khz?  Have you seen this signature before?  Here's a
>>> > screenshot showing what it looks like:
>>> >
>>> > http://www.magma.ca/~ve2iq/saq_qrm.gif
>>> >
>>> > Any ideas would be much appreciated.
>>> > 73,
>>> > Bill VE2IQ
>>> >
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