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Setting ISO Standards for Building Snarfers


NOTICE: TO ALL CONCERNED Certain text files and messages contained on this site deal with activities and devices which would be in violation of various Federal, State, and local laws if actually carried out or constructed. The webmasters of this site do not advocate the breaking of any law. Our text files and message bases are for informational purposes only. We recommend that you contact your local law enforcement officials before undertaking any project based upon any information obtained from this or any other web site. We do not guarantee that any of the information contained on this system is correct, workable, or factual. We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.
Introduction.
~~~~~~~~~~~~~
Hello again.
Much has happened since the release of SNARF!.TXT & SNARF2.TXT.
I released a file called PAIRINFO.TXT, which provided information on the
decoding procedure to be applied once the datastream had been recovered.

The major purpose of this Tfile is to set some sort of ISO standard for
snarfers, I will also include some additional information that may be
useful to budding snarfer builders.

DaVeX. July 1995.

Proposals
~~~~~~~~~

To enable software to be compatible with all snarfers, I propose the
following:-

1} All data recovery to TTL including XOR to be done in hardware.

2} The interface to the PC to be CELLTRAK compatible.

Pin 10 = clock
Pin 15 = data

This will allow hardware to be tested before the software
is written. Run up CELLTRAK, and once monitoring of the
forward channel is underway, remove the lead from the
parallel port and plug in the snarfer hardware with the
input tuned to a forward channel too, if normal paging
info continues to scroll up the screen and the busy/idle
flag on the status bar behaves normally, then you can be
99.9% sure your hardware is werking correctly.

3} Software must recognise inverted data and take the nescessary
steps. ( See additional info (1) below.)

4} All snarfer builders following these guidelines pay 100 quid
into my swiss bank acc. :-)

This will achieve two results, hardware will be relatively simple to test,
and it opens the door to all the ace coders without hardware to develop
software for snarfing indepently of hardware builders.

For those without PC's that are attempting to get snarfing, GO BUY A PC!

Additional info
~~~~~~~~~~~~~~~

This is just extra info that may or may not be useful whilst trying
to build the hardware.

1} The ETACS and AMPS specifications define a NRZ encoded logic 1
as a LOW to HIGH transition in the center of a databit period.
The polarity of the demodulated datastream is dependent on the
local oscillator in the receiver being used.

2} Clock recovery extracts an 8 or 10 kHz (ETACS or AMPS) phase
locked clock signal from the Manchester encoded datastream.

3} Manchester decoding is achieved by exclusive ORing the
recovered Manchester encoded data with the recovered clock.

4} The clock recovery PLL on the reverse control channel has
3.75ms of dotting (ETACS) and 3ms (AMPS) in which to lock,
or wordsync will be missed.

5} A transmitted pair (along with the dross) takes 156ms to send.
(ETACS). 125ms (AMPS).

6} Snarfing follows an exponetially square qubic variant of sods
law, you either get loads or fuck all.

 
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