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'using pager as alarm ?'
1999\05\21@191457 by tim

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now i had the same idea....some time ago.......to beep my pager if the
silent alarm went off................nobody new but the pager on my
side..vibrating with a secret code of 3  OR MORE########,,,,,,short distance
will do a foot ball field in diameter...great...........on the receiver
there should be a freq. marked telemetry   freq....
{Original Message removed}

1999\05\22@064629 by Dr. Imre Bartfai

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Hi,
I think it would an extremely complicated task. Why? Because of the coding
of the callee ID in the RF telegram. For details see http://www.etsi.org
I think this will frighten you (me too...).
Imre


On Fri, 21 May 1999, tim wrote:

> now i had the same idea....some time ago.......to beep my pager if the
> silent alarm went off................nobody new but the pager on my
> side..vibrating with a secret code of 3  OR MORE########,,,,,,short distance
> will do a foot ball field in diameter...great...........on the receiver
> there should be a freq. marked telemetry   freq....
> {Original Message removed}

1999\05\23@194117 by ARudzki

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Wouldn't it be easier to use active pagers, and call them via a modem?

simply send them:

"ATDT ###-####;"<CR>
;wait about a second
"ATDT 'your code #####'<CR>
;wait about a second
"ATH0"


tony

1999\05\23@200437 by Richard Prosser

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You need to know not only the frequency but the pager coding system
(including CRC calculation), and the pager code number(s). The pager coding
could be a well defined one such as POCSAG (used fairly extensively in
display pagers etc) or any one of many proprietary ones.
You might have to spend a bit of time looking on the web for info. Step one
would be to get as much info from anything printed/stamped on the pagers
themselves.
I haven't been near pagers since about 1979 so things will have changed
somewhat. In those days we were setting up a pager for use with the early
POCSAG code (4 codes/pager - no display capability)but the actual pager code
number/encoding wasn't too hard. The CRC and error checking was the worst
part but this wouldn't bother you once you know what to send (We used a
lookup table for error detection). Data rate was 256bits/sec from memory
with a 14 bit(?) word. Each transmitted string consisted of a number of
frames - the pager number determined which frame was valid for which pager.
The data transmission was preceded with a preamble to get bit sync, then a
framing word to enable frame sync. Following this was the actual data frames
separated, I think, by frame words.

None of which may be any use at all. - Still it might help

Richard

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