[600MRG] 2200M Denial!

Fri Oct 20 16:52:12 CDT 2017

I've been trying to dig up some actual frequeny allocation sinfo for PLC. 
I stumbled across this document containing this paragraph.

MIMO Power Line Communications

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MIMO Power Line Communications

One of the first publications of its kind in the exciting field of multiple input multiple output (MIMO) power l...
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    On Friday, October 20, 2017, 4:13:40 PM EDT, Joe <nss at mwt.net> wrote:  

 I would let them know about your already legal transmissions, that 
caused no problems, maybe give a waiver?

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 10/20/2017 12:18 PM, John Andrews wrote:
> Mike,
>
> I'm not so sure. The deployment of Smart Grid stuff in Worcester has 
> involved higher frequencies, and I have not seen any add-ons to the 
> line transformers on poles indicating that they are trying to couple 
> residential circuits back to the distribution network.
>
> The real reason for this became clear yesterday, when I called up a 
> mapping program and followed the distribution lines around town. I 
> didn't realize that some lines running beside RR tracks in the woods 
> behind my house were part of a fairly main trunk running from 
> Worcester through Holden to West Boylston. I identified two subs - one 
> in Worcester, maybe 5 miles away, and one in Holden, less than 2 miles 
> away. I'm certain that this is the target distribution.
>
> The catch is that there have never been any audible/visible signals in 
> the 2200 meter band that I would correlate with a PLC. My present 
> guess is that they're not in-band at all, but within a guard band 
> which must account for receiver BW in their system. So I will be 
> looking over a wider chunk of spectrum when I get back to MA at the 
> end of this month.
>
> It's possible that they have set their guard band a little wide, in 
> which case I might have an argument for why my years of operation so 
> near to their lines caused no problem. Just a guess right now...time 
> will tell.
>
> John, W1TAG
>
> On 10/20/2017 8:26 AM, michael polia wrote:
>> John,
>>
>> Your Holden QTH is with 1 Km of Worcester, which operates a smart 
>> grid (courtesy of National Grid).  I suspect that's the reason for 
>> the denial.
>>
>> 73
>> Mike
>> AB1AW
>>
>>
>> ------------------------------------------------------------------------
>> *From:* John Andrews <w1tag at charter.net>
>> *To:* Dexter McIntyre W4DEX <dexter.mc at gmail.com>
>> *Cc:* "600mrg at w7ekb.com" <600mrg at w7ekb.com>
>> *Sent:* Wednesday, October 18, 2017 1:58 PM
>> *Subject:* Re: [600MRG] 2200M Denial!
>>
>> Dex,
>>
>> When we get back to Massachusetts full-time at the end of this month, I
>> will be doing some research. There's no substation really nearby, but
>> I'll do some driving around. I also plan to do a little camping in the
>> woods near the <1km lines to see what I can hear/see with an SDR and a
>> laptop. That'll be lighter than carrying the old Rycom meter around!
>>
>> I don't intend to raise any questions with UTC right away. Need to get
>> better educated first.
>>
>> John, W1TAG
>>
>> On 10/18/2017 1:27 PM, Dexter McIntyre W4DEX wrote:
>>  >
>>  >
>>  > On Mon, Oct 16, 2017 at 6:40 PM, John Andrews <w1tag at charter.net 
>> <mailto:w1tag at charter.net>
>>  > <mailto:w1tag at charter.net <mailto:w1tag at charter.net>>> wrote:
>>
>>  >
>>  >    Interesting. UTC has denied my operation on 2200M from my 
>> Holden, MA
>>  >    QTH.
>>  >
>>  >
>>  >
>>  > John,
>>  >
>>  > That's like "a black fly in your Chardonnay".  Ironic that you, of 
>> all
>>  > people, would be denied 2200 meters after all the years operating the
>>  > band.   Hopefully you'll find a way around this restriction.
>>  >
>>  > For the past few years every time I spotted a power substation I 
>> would
>>  > look for evidence of a PCL line trap.  So far I've not found one.  
>> There
>>  > are lots of pictures online of these coils.
>>  >
>>  > 
>> https://www.google.com/search?q=plc+line+traps&safe=active&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjOw-my1vrWAhUBdCYKHQtqAmYQ_AUICygC&biw=1440&bih=790
>>  >
>>  > It looks like most are in a readily visible location. There is a 
>> 100KV
>>  > line a few hundred feet from my home that links two substations.  I'm
>>  > about in the middle with each substation about 3 miles away.  No
>>  > indication of a line traps at either.  I assume there are many more
>>  > substations in your area so not likely you would find the one with 
>> PLC
>>  > equipment.   I wonder if anyone has seen any indication of this old
>>  > technology in use.
>>  >
>>  > Dex
>>
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>>
>
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