Proxmark3 community

Bumjubeo

Member

Registered: 2014-04-24

Posts: 3

Odd Tag issues

Hey guys,

I'm pretty new to this so bear with me.

I've got a proxmark3 fresh out of the box, and i'm trying to scan one of my cards which doesnt seem to be getting detected easily, and when it does get detected I never get the same values.

Proxmark 3 version:

#db# Prox/RFID mark3 RFID instrument       
#db# bootrom: svn 0 2014-04-01 12:12:24       
#db# os: svn 0 2014-04-01 12:12:24       
#db# FPGA image built on 2014/03/24 at 21:54:44       
uC: AT91SAM7S256 Rev B
Embedded Processor: ARM7TDMI
Nonvolatile Program Memory Size: 256K bytes
Second Nonvolatile Program Memory Size: None
Internal SRAM Size: 64K bytes
Architecture Identifier: AT91SAM7Sxx Series
Nonvolatile Program Memory Type: Embedded Flash Memory

HW TUNE (Tag on antenna):

# LF antenna:  5.24 V @   125.00 kHz
# LF antenna:  5.10 V @   134.00 kHz
# LF optimal: 12.49 V @   244.90 kHz
# HF antenna:  0.58 V @    13.56 MHz
# Your HF antenna is unusable.

HW TUNE (Tag off antenna):
# LF antenna:  5.24 V @   125.00 kHz
# LF antenna:  5.24 V @   134.00 kHz
# LF optimal: 16.25 V @   222.22 kHz
# HF antenna:  0.71 V @    13.56 MHz
# Your HF antenna is unusable.

The data I get with the card i've got (This is a used card that works for sure)

Its hard to get a read off of the card I have to move it around and it doesnt always detect when its sitting right on the antenna but these are the Tag ID's I keep getting:

#db# TAG ID: 000000001 (0)           
#db# TAG ID: 00000000d (6)       
#db# TAG ID: 000000003 (1)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000003 (1)       
#db# TAG ID: 000000002 (1)       
#db# TAG ID: 000000009 (4)       
#db# TAG ID: 000000001 (0)
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)
#db# TAG ID: 000000007 (3)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000005 (2)       
#db# TAG ID: 00000001c (14)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000003 (1)       
#db# TAG ID: 000000001 (0)       
#db# TAG ID: 000000001 (0)

I have tried the HF antenna as well but I really do get nothing on that one. What am I doing wrong?

Is there any other data I can provide for assistance?

midnitesnake

Contributor

Registered: 2012-05-11

Posts: 151

Re: Odd Tag issues

Best thing to do is run hw tune,
then place a card on the antenna
and run hw tune (with the card on the antenna).

Repeat for the other antenna, and post your results here

Enio

Contributor

Registered: 2013-09-24

Posts: 175

Re: Odd Tag issues

Your lf antenna is just bad it seems.

asper

Contributor

Registered: 2008-08-24

Posts: 1,409

Re: Odd Tag issues

Yeah 5.24v are far away not enough for 125khz.

Bumjubeo

Member

Registered: 2014-04-24

Posts: 3

Re: Odd Tag issues

AHhh Thats what it is! The surface.

I moved the surface that the antenna was sitting on and now it reads waaaaay better.

Thats all I needed. thanks guys!

Bumjubeo

Member

Registered: 2014-04-24

Posts: 3

Re: Odd Tag issues

# LF antenna: 13.70 V @   125.00 kHz
# LF antenna: 21.21 V @   134.00 kHz
# LF optimal: 23.77 V @   130.43 kHz
# HF antenna:  0.81 V @    13.56 MHz
# Your HF antenna is unusable.

For reference