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#1 2019-11-04 20:59:41

Martinorak
Contributor
Registered: 2019-10-16
Posts: 7

Modulation : DIRECT/NRZ

Hi,

I try it command lf t55xx detect
Chip Type  : T55x7
Modulation : DIRECT/NRZ
Bit Rate   : 1 - RF/16
Inverted   : No
Offset     : 47
Seq. Term. : No
Block0     : 0x00040000

because lf search u not working.

I also try it lf t55xx dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00040000 | 00000000000001000000000000000000
  1 | 00100000 | 00000000000100000000000000000000
  2 | 00000000 | 00000000000000000000000000000000
  3 | 00400000 | 00000000010000000000000000000000
  4 | 00100000 | 00000000000100000000000000000000
  5 | 00400000 | 00000000010000000000000000000000
  6 | 00400000 | 00000000010000000000000000000000
  7 | 01000000 | 00000001000000000000000000000000
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | FFFFFFFF | 11111111111111111111111111111111
  1 | FFFFFFFF | 11111111111111111111111111111111
  2 | 00000000 | 00000000000000000000000000000000
  3 | 01000000 | 00000001000000000000000000000000


How can I get command for clone ? Or How can I decrypt it ?

Thank you so much !! smile

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#2 2019-11-04 23:55:18

mwalker
Contributor
Registered: 2019-05-11
Posts: 193

Re: Modulation : DIRECT/NRZ

while it says NRZ, then config looks very blank for a t55xx.

Maybe perform and

lf read
data save filename.pm3 

and share via a file sharing service and post a link to it.

edit: as per icemans request.

Last edited by mwalker (2019-11-05 00:25:58)

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#3 2019-11-05 00:12:16

iceman
Administrator
Registered: 2013-04-25
Posts: 5,879
Website

Re: Modulation : DIRECT/NRZ

..maybe incurage ppl to use filesharing services ?


If you feel the love,  https://www.patreon.com/iceman1001

modhex(hkhehghthbhudcfcdchkigiehgduiehg)

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#4 2019-11-05 11:18:56

Martinorak
Contributor
Registered: 2019-10-16
Posts: 7

Re: Modulation : DIRECT/NRZ

Hi, very thanks for your time. Maybe see as blank but I think it´s one of first chip here on the system. Maybe have easy to remember code.

File is here https://we.tl/t-z5SgP72yQl

I hope I used the right service you wanted.

Thanks
Martin

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#5 2019-11-06 14:41:09

Martinorak
Contributor
Registered: 2019-10-16
Posts: 7

Re: Modulation : DIRECT/NRZ

Do you have any idea how to clone this chip?

Thanks for your time

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#6 2019-11-07 08:53:33

mwalker
Contributor
Registered: 2019-05-11
Posts: 193

Re: Modulation : DIRECT/NRZ

The data in the file is very week.  I would like to see a much stronger signal.

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#7 2019-11-11 09:24:09

Martinorak
Contributor
Registered: 2019-10-16
Posts: 7

Re: Modulation : DIRECT/NRZ

Here is new data. Please try it or tell me how can I get it better data (signal).

https://wetransfer.com/downloads/cf188318cec615f5a0863cb4d3cb315220191111082132/d2f20562363f7e8d289f12e0f45b0c4920191111082132/380a81

Thanks
Martin

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#8 2019-11-11 12:28:05

mwalker
Contributor
Registered: 2019-05-11
Posts: 193

Re: Modulation : DIRECT/NRZ

based on the data in the file(s) i am not sure its an lf/125 khz card.
It seems to be not much more then just noise (with no card on the reader)
Can post the results of the following with no card on the reader, then repeat but with the card on the reader.

hw tune

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#9 2019-11-13 11:30:27

Martinorak
Contributor
Registered: 2019-10-16
Posts: 7

Re: Modulation : DIRECT/NRZ

Here is new data:

1. without card LF
2. with card LF
3. without card HF
4. with card HF

https://wetransfer.com/downloads/32b816aa9df6edcd867292284e0c8bb920191113102748/b31df3d752ed6767215f0b4d3d10eba420191113102748/7cd355

And here is image from HW TUNE with LF antenna
https://imgur.com/a/5plBLbE

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#10 2019-11-13 23:42:29

mwalker
Contributor
Registered: 2019-05-11
Posts: 193

Re: Modulation : DIRECT/NRZ

I will let the hardware guys comment more on this, but to me the hw tune voltages look low.  And the HF looks like its antenna is not there.

hw tune with no tag (copied from the image so others can quickly see)

# LF antenna: 19.25 V @ 125.00 kHz
# LF antenna:  9.76 V @ 134.00 kHz
# LF optimal: 19.25 V @ 125.00 khz
# HF antenna:  0.81 V @  13.56 Mhz

with tag

# LF antenna:  8.94 V @ 125.00 kHz
# LF antenna:  9.07 V @ 134.00 kHz
# LF optimal:  9.76 V @ 110.09 khz
# HF antenna:  0.85 V @  13.56 Mhz

Is the device you are trying to read a full size card or a fob/tag ?

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#11 2019-11-14 08:44:56

iceman
Administrator
Registered: 2013-04-25
Posts: 5,879
Website

Re: Modulation : DIRECT/NRZ

Looks like a decent antenna 19v,  is this a RDV2 device?   And the voltage drop indicates a good coupling.  You shouldn't have any issues with it.   The HF looks like its been disconnected, which is possible on a RDV2 with its individual cables.


If you feel the love,  https://www.patreon.com/iceman1001

modhex(hkhehghthbhudcfcdchkigiehgduiehg)

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#12 2019-11-14 10:18:29

mwalker
Contributor
Registered: 2019-05-11
Posts: 193

Re: Modulation : DIRECT/NRZ

thanks iceman, i guess I have gotten used to the RDV4 voltages, even my easy is 35V

The data files have very low readings, the first one was -2 to 2 (i.e. looked like nothing was on the antenna).  the second one was a little better, but still very low.  So I'm running out of ideas.

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