[Lowfer] Report and Order

[Eric Smith]

Got it.  Thanks, Craig.  Good information and good suggestions.

Eric KD5UWL

> On Jul 9, 2015, at 8:15 PM, N6IO <n6io at wasson.com> wrote:
>
> My understanding is that only long-haul and some regional "distribution"
> lines carry PLC.   I suppose I need a better term for lines that carry
> PLC.  We need an easy way to identify them since UTC seems to consider the
> location of these lines to be secret.  Lines that supply power to customers
> would not use PLC.
>
> I've seen some reference to PLC running on 100KV and higher voltage lines.
> I suppose there is some standard size of insulator being used on these
> lines - I suspect that if the insulators are shorter than 1 foot they
> wouldn't likely carry PLC.   It might be better to have the rules just
> specify a distance from lines carrying PLC and make it the responsibility
> of the utilities to let hams know which those are.  Typical lines that feed
> customer transformers are 1200v. and just have 1 or 2 insulators. Lines to
> typical local substations would run 12kv.  In the R&O it mentioned there
> are 2200 PLC systems in the US - so the vast majority of lines do not use
> it.  My guess is any line on a single wooden pole would not.
>
> Maybe they can publish a power line spotters guide.
>
> 100 M separation is about the best we can hope for based on some
> interference studies published back in the 80's.
>
> Craig - N6IO
>
>
>> On Thu, Jul 9, 2015 at 8:49 PM, Eric Smith <esmithmail at gmail.com> wrote:
>>
>> 100m from transmission lines?  That's a whole block.  This must mean
>> high voltage long haul lines, not the distribution lines that run
>> along many city streets?  For many folks it would be impossible to get
>> 100m from these distribution lines if the transmitter has to be at
>> your house (not portable).
>>
>> So must mean the high voltage long haul lines?  Otherwise I wouldn't
>> suggest the 100m ..
>>
>>> On Jul 9, 2015, at 7:40 PM, N6IO <n6io at wasson.com> wrote:
>>>
>>> If I am reading the July 7th FCC WRC-07 Implementation Report and Order
>> and
>>> WRC-12 Order correctly, the 2200 meter band is officially allocated as a
>>> new ham band.  Operation will not be allowed until the FCC adopts service
>>> rules after reviewing comments on the previous NPRM.
>>>
>>> This is very good news.  Interference potential at 2200 meters is higher
>>> than at 630 meters, so it seems very likely the 630 m band will also be
>>> approved.
>>>
>>> I'm thinking that reply comments should focus on what these service rules
>>> will be.  In the report the FCC again mentioned not allowing mobile
>>> operations, but only fixed operations.  I don't see the benefit of not
>>> allowing portable/mobile operations as long as a distance limit from
>>> transmission lines is established.  So my comments will focus on how far
>> a
>>> transmitter must be (100 M) from these lines and why with 1W EIRP
>>> interference is not possible at that distance.
>>>
>>> The report also mentioned limiting antenna height, but since the power
>>> limit is based on EIRP this makes no sense.  A short antenna can produce
>>> the same radiated signal strength as a tall antenna if power is adjusted
>> to
>>> meet the 1W EIRP limit.
>>>
>>> At 630 m the FCC has the option of allowing 5W EIRP - I think we should
>>> encourage that.  At the higher power level it might be necessary to
>>> increase the separation between antennas and transmission lines to 500 or
>>> 1000 meters to allow for an extra 7 db of isolation.
>>>
>>> Is this how others read this Report and Order?
>>>
>>> Craig - N6IO
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