[Lowfer] Report and Order

[Eric Smith]

I noticed our very good friend John D is mentioned in there prominently.  Good work, John.


> On Jul 9, 2015, at 8:21 PM, Eric Smith <esmithmail at gmail.com> wrote:
> 
> 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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