Dave Oldridge wrote:

Algorithms will only help you by slowing down and using redundancy or by
being frequency agile and thereby clearng off my frequency. And NO
equipment DESIGNED to be a sensitive receiver at the frequencies you want
to use will be immune to even stronger signals picked up by the open
ANTENNA that you're using for a "transmission cable."


Good point, Dave. Any error correction comes with the expense of time,
and of course slows down the transmission of the data. The packet
doesn't jibe, so it is asked for again, and again, and so on. Better be
a heck of a algorithim when the interfering signal is really strong as
to swamp the modem's reciever.

There are plenty of examples to the contrary of the digital signal as
robust entity. Experiments have been made in which a 5 watt signal in a
car with a mobile antenna will knock out nearby BPL signals. 100 watts
in a car will do even more damage, and a base station yet more. Other
experiments have shown the so called notches being abandoned after the
system was unable to send good packets. Kind of like it was getting
desperate almost.

Seeing as how qrp levels into inefficient antennas can cause problems,
I have to wonder what will happen during the next sunspot max.

The whole BPL affair makes me kind of wonder why shielding was invented.

And for what? a DSL speed "broadband" digital signal? BPL is a poor
solution to the problems of ten years ago. It is the 8-track of
broadband access.


- 73 de Mike KB3EIA -