[UK-CONTEST] Broadband

[Bernie McIntosh (GM4WZG)]

I've cured similar ADSL broadband problems by ensuring that all of the house
telephone wiring is on the audio side of the filter and that the filter is
located at the point of entry to the house. 

Infinity uses VDSL which does indeed use a greater spread of frequencies
than ADSL.  I would expect it will be therefore more susceptible to 40 and
30m RF. Maybe even to desensing from 20m RF.

But there are several pieces of good news -  the system works by negotiating
lots of different frequency slots that it then uses in parallel to effect
the communication. If you knock off all the high ones the rate will drop
significantly, but in most cases you'll have sufficient unnaffected slots
for some kind of broadband service to be usable. After your operating is
over, the system should eventually re-negotiate and lay claim to its
original frequency slots again.   ADSL works the same way but 160 and 80 can
wipe it out more or less completely because there are fewer frequency slots
in use.


The normal layout for VDSL is to have it at the point of entry to the house
to reduce the distance the signal has to travel over low quality wiring.
This will afford a great deal of protection in the first place.

But its all theory at the moment - there seems to be few reports at the
moment concerning VDSL and ham radio.  It will be very interesting to hear
from any hams that use VDSL and know if they have problems or not.


73

Bernie
GM4WZG