charlie wrote:
> On 8/15/2011 3:00 AM, Paul wrote:
>> Electric Plugs wrote:
>>>
>>> Does this work to have fast internet access? My telephone lone is about
>>> 20ft away from my desktop and now I getting internet via a wireless ADSL
>>> Modem. I was wondering if I buy something like these plugs (See link
>>> below) it would increase the speed throughput with cables Cat5/6?
>>>
>>> Apparently these plugs allow you to get signals via the electric cables
>>> in the house.
>>>
>>> <http://www.amazon.co.uk/NETGEAR-Powerline-Adapter-XAVB2001-wall-pluggable/dp/B00346SZ90>
>>>
>>>
>>>
>>> Thanks.
>>
>> Putting EMI onto the power lines, upsets amateur radio
>> usage. Try something else instead. It's an abuse of
>> technology (whether the frequency band polluted is notched
>> or not).
>>
>> I'm not a ham radio operator, but I've read enough about
>> their struggles to deal with the noise from it.
>>
>> At least with Wifi as an alternative, there is a defined
>> band for the Wifi to pollute (shared with things like
>> your microwave oven).
>>
>> Paul
>
> The power company adds EMI to the incoming power anyway.
> Remote demand control of such things as air conditioners, water heaters,
> etc.
> Possibly Meter reading in some locations. They are usually vary happy to
> sell you filters at an outrageous price.
>
> As to the low power Ethernet to power adapters, You would need to be
> fairly close to have problems, or a an amateur with a rather poor receiver.
>
> That said, the power to Ethernet adapters work when they are on the same
> circuit, or at least the same side of the usual 240/120 (or so) split
> phase used in most US residences.
>
> I've had better luck with routers that are both Ethernet and wireless
> than power line to Ethernet adapters.
Our intelligent meters here, use Wifi and a piconet (point to point relay).
So the lines themselves aren't used for communications at all. The Wifi
frequency, probably isn't the same as computer Wifi.
It really depends on what country you're in, as to how feasible long
range communications is, over power lines. Where the transformers are
and the like.
http://en.wikipedia.org/wiki/Power_line_communication
"The second major issue is signal strength and operating frequency.
The system was expected to use frequencies of 10 to 30 MHz, which has
been used for many decades by amateur radio operators, as well as
international shortwave broadcasters and a variety of communications
systems (military, aeronautical, etc.).
Power lines are unshielded and will act as antennas for the signals
they carry, and have they will interfere with shortwave radio
communications."
In my estimation (with no vested interest for or against this tech,
since I'm not into amateur radio), this was pushed out without
sufficient and proper testing. It should have been stopped, as a
polluter of the airwaves and never been sold to consumers. There
are plenty of other schemes (like Wifi) that treat their
RF space properly (i.e. follow whatever license rules were
provided on ERP and the like). Even when your Wifi isn't working,
because of local radio pollution, at least the Wifi isn't likely
to be affecting someone else's ability to use a shortwave radio,
or listen to a broadcast radio signal (AM/FM).
Paul