Transmission: impossible

[martin griffith]

have a squint at this
http://technology.guardian.co.uk/weekly/story/0,16376,1637573,00.html


martin

 

[Tim Shoppa]

http://technology.guardian.co.uk/weekly/story/0,16376,1637573,00.html

Sounds like true "broadband", from my reading of the not-too-technical
article there isn't even a low-Q tuned tank circuit around anywhere.
The transmitter just throws out an apparently arbitrary waveform into
the ether. The other interpretation is discontinuous phase FSK but
that wouldn't give you any advantages (just lots of clicking) would it?

If they can receive this with a "50-cent receiver" as they claim then
they're doing something at least moderately clever! A GHz A/D does not
come that cheap (or does it?) I don't even know from the article what
band they're using, if this can be done at LF/VLF (maybe it can) then
it would meet that price point.

Tim.

 

[John - kd5yi]

have a squint at this
http://technology.guardian.co.uk/weekly/story/0,16376,1637573,00.html


martin

I'm not that impressed.

An 850 ft tower puts the antenna more than high enough for it to be a
line-of-sight connection at 18 miles. 50 mW at 18 miles gives about -104
dBm of signal with 0 dB antenna gains in free space. It is probably more
like -101 dBm since the signal is not radiated spherically. Adding in a
little antenna gain could make the signal about 95 dBm. I have a $5 ISM
band regenerative receiver with a specified sensitivity of -103 dBm. It
won't do 3.7 Mbits/sec, however.

It sounds like it might be good technology, but not a miracle.

Cheers,
John

 

[Paul Burridge]

have a squint at this
http://technology.guardian.co.uk/weekly/story/0,16376,1637573,00.html

I don't believe it. Sounds like a crock of sh*t.

 

[Chris Jones]

have a squint at this
http://technology.guardian.co.uk/weekly/story/0,16376,1637573,00.html

bollocks more like.

Bet the analysts like it though...

 

[martin griffith]

bollocks more like.

Bet the analysts like it though...

Yep, not a very good stage show, I tried to read through the patent,
but I fell asleep, they do that to me, the journo's didnt ask the
right questions, shame.

I'll put the link into the "pending dept", see what happens in a year.

It'll be nice if it works


martin