From: Gary Tait
Subject: Re: old cellphone reuse/salvage and schematics/tech info?
X-Newsreader: Forte Free Agent 1.92/32.572
Date: Sun, 05 Jan 2003 10:37:25 -0500
NNTP-Posting-Date: Sun, 05 Jan 2003 10:39:19 EST
Organization: WorldCom Canada Ltd. News Reader Service
On Sat, 04 Jan 2003 13:18:45 -0500, "Smile, it can only get WORSE"
>Good Day all,
>What happens to old cell phones? They seem to be throw away devices,
>even tho they still work after the contract runs out. These days 2
>years of use makes the phone ancient and worthless, regardless of
>whether it still works or not.
>But these things are full of good rf parts sensitive 800 mhz receivers
>that can be put on 900 mhz ham bands and 3 watt transmitters that can
>run cw or fm---since the receiver and the transmitter have to run in
>close proximity to each other (and in full duplex), their LO's and
>transmitter spectral output has to be squeaky clean. Of course, there
>is a duplexer and the thing is loaded with top quality UHF rf
>components. Some of them have 'test modes' which allows the user to
>tune and transmit and manually control the frequencies from the
>Anyway, I never see service manuals or other technical information for
>these things and a one year old cellphone goes for 20 bucks or less on
>ebay these days! 2 year old cell phones go for 3 for 20 bucks or so..
>Has anyone hacked into these and published any information on using
>them for alternative purposes???? Or gaining control of these things
>in service mode? Does anyone deal in Service Manuals for these
>Email me or post reply here.
>Have a great day.
If you look through the Usenet archives ( http://groups.google.com ),
Yo will fine a brief post or two on my efforts, to that date, of kind
of reverse engineering and re-using a bag/transmobile type phone.
The key really, is to use only the RF/IF strip, and essethinally
dump/replace the CPU/Control boards with something you can
control (I was programming the PLLs with a PC)