On Sat, 14 May 2011 02:07:33 +0100, The Natural Philosopher wrote:

How well do they perform regarding interference to radio reception
in
the HF (short wave) spectrum? Serious question.

Some very well indeed, they are all anyone within a mile or so will
be able to hear on their HF set. B-(

T get the sorts of speed they do, they are probably well into UHF at
least I would say.

If not gigahertz.

I don't think they are broadband. Mote like wifi 2.4Ghz or summat.

AFAICT from a google the basics is OFDM with a carrier spacing of
24.41kHz. So they are broadband (correct useage of the word)

http://www.solwise.co.uk/adsl-sar605eh.htm

Gives 4.3Mhz to 20.9Mhz as the band of frequencies in use.

http://www.powerlinenetworking.co.uk...t/view/144/25/

Says 2MHz to 30MHz and 24kHz but WTH pretty much all of the HF
frequency band. Standards compliant devices are supposed to not use
the carriers that land within the amateur radio bands but I bet there
is still considerable hash generated by them which raises the noise
floor.
And what about trying to use the HF bands outside the amateur
allocations?

As the OP is running mains to his caravan why can't he also run a bit
of ethernet, be cheaper, faster, more reliable and won't generate
masses of HF interference.

--
Cheers
Dave.