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#1 2015-04-28 18:13:49

joe
Contributor
Registered: 2013-08-15
Posts: 126

Old LF tag

This is an old LF tag, rawdemod shows only 3 and a half blocks, any ideas with it ??  i'm using LF search..

Using Clock: 128 - Invert: 0 - Bits Found: 156         
ASK/Manchester decoded bitstream:         
0011111111101001         
0110110010000011         
1111111010010110         
1100100000111111         
1110100101101100         
1000001111111110         
1001011011001000         
0011111111101001         
0110110010000011         
No Known Tags Found!
proxmark3>

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#2 2015-04-28 18:20:41

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

Re: Old LF tag

Looks like it is something it couldn't identify.  The detected clock is high and likely incorrect.  Meaning either it's a poor read or it is not ask modulated, but kinda looks like ask to LF search.  Best option is to graph it and identify the correct modulation and go from there.  Or post a trace.

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#3 2015-04-28 18:39:57

joe
Contributor
Registered: 2013-08-15
Posts: 126

Re: Old LF tag

I used bin 200 to try again, output the same, but i dont have the tag right now. cant try.

Checking for Unknown tags:

Possible Auto Correlation of 3584 repeating samples

Unknown ASK Modulated and Manchester encoded Tag Found!

if it does not look right it could instead be ASK/Biphase - try 'data rawdemod ab'
1011011001000001
1111111101001011
0110010000011111
1111010010110110
0100000111111111
0100101101100100
0001111111110100
1011011001000001
1111111101001011

maybe the antenna bad

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#4 2015-04-28 22:28:49

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

Re: Old LF tag

when you have a tag temporarily save a trace file on your test PC so you can continue playing with it later...

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