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#1 2015-06-01 16:05:13

iceman
Administrator
Registered: 2013-04-25
Posts: 9,491
Website

T5 transponder trace.

Hi,

Ref Trace::  https://www.sendspace.com/file/oegvlf


It is supposed to be a T5 transponder chip,  but I don't know how to read it..

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#2 2015-06-02 02:38:31

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: T5 transponder trace.

it appears your tag is outputting 128 0 bits (or 1 bits i suppose)..  there appears to be a "marker" between the transmissions.  remove the first of those (ltrim) and data rawd am   ...
it will output a 7 when it hits the "marker" as the marker isn't a proper manchester wave.

Last edited by marshmellow (2015-06-02 02:47:03)

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#3 2015-06-02 02:40:36

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: T5 transponder trace.

we could use the em4x50 read i fixed as a guide and make a similar demod for this, as it had a similar "marker" between blocks.

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#4 2015-06-02 02:42:21

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: T5 transponder trace.

btw,  the read looks very weak, so either chip has a small or weak antenna, or your lf antenna is weak, or 134khz?

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#5 2015-06-02 08:06:25

iceman
Administrator
Registered: 2013-04-25
Posts: 9,491
Website

Re: T5 transponder trace.

Its a small small glasschip,  like they have inside car keys I guess.  10mm x 2mm   so yes the antenna signal will be somewhat weak.

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