[600MRG] From the UTC front page

[John Langridge]

Hi Laurence,

This is nothing new.  The allocation of 10-490 kHz has been part of
UTC's spectrum retention policy for a very long time.  They have
always been regulated under Part-15 but there has been gray area until
about a year ago when UTC changed their website (and their formal
operating name) to reflect the realities of the situation.

You will never find a map and as the R & O indicates, for security
reasons UTC will remain the sole holder of the database.  In fact the
website allows official critical infrastructure users to gain access
to the database. That ain't us.

Unofficial information that comes on good authority from a couple of
PE's that work in power distribution that I've had the pleasure to get
to know over the last few years and "pick their brain" is that in the
lower-48, there is no active PLC above 300 kHz.  In fact one indicates
that there isn't any above 200 kHz.  All of this comes as
word-of-mouth and is not warrantied so take it as you will but these
guys are the real deal and in a position to know these things.

Most signaling on power systems is transitioning to IP which was part
of what drove UTC's official name and agenda change.  That which
remains, mostly in rural areas, is occurring around 53 kHz.

SO when I mentioned yesterday that Mike wasn't going to have any
problems, it was based on this information.

If you look at 97.303(2), you will see that frequencies must overlap
so based on this info, it should not be a problem for most of us on
472.



73,

John KB5NJD / WG2XIQ

On Fri, Mar 31, 2017 at 10:15 AM,  <lstoskopf at cox.net> wrote:
> "Electric utilities are allowed to use power line carrier (PLC) transmitters and receivers for control signals and information transmission in the 10-490 kHz band without obtaining a license from the Federal Communication Commission (FCC). However, PLC users are not protected from interference from licensed radio transmitters."
>
> So the FCC HASadded protection.  From the power line company security standpoint, good luck getting them to tell you what frequency they are using.
>
> Still looking for a map of which lines use PLC.
>
> N0UU
>
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