Proxmark3 community

scott

Contributor

Registered: 2014-03-21

Posts: 14

Purchased LF Antenna Read-only

Hi, I'm Scott, and I just received my Proxmark3.

It can read HID cards and fobs just fine, but I hope that you'll have some feedback to help me troubleshoot a problem write/clone/simulate commands.  I’m using the LF antenna and Proxmark3 purchased via the website.

proxmark3> hw version
#db# Prox/RFID mark3 RFID instrument                 
#db# bootrom: svn 848 2014-02-28 07:25:33                 
#db# os: svn 848 2014-03-19 23:06:51                 
#db# FPGA image built on 2014/02/25 at 07:43:59                 
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         
proxmark3> 

proxmark3> hw tune
proxmark3>
proxmark3> #db# Measuring antenna characteristics, please wait...                 
proxmark3> #db# Measuring complete, sending report back to host                 
proxmark3>           
proxmark3> # LF antenna: 13.29 V @   125.00 kHz         
proxmark3> # LF antenna: 22.96 V @   134.00 kHz         
proxmark3> # LF optimal: 25.24 V @   131.87 kHz         
proxmark3> # HF antenna:  0.35 V @    13.56 MHz         
proxmark3> # Your HF antenna is unusable.         

I have RFID readers that can read HID Proxkey fobs and HID cards, but I can’t simulate the same card and get the reader to see it.
I’m not able to clone to a T5577 card or get any reader to acknowledge that the antenna is doing anything.  I’ve tried stand-alone mode as well without success.  I read that my antenna voltage should be at least 12v, but I've also read the getting started guide that shows over 30v.

Thoughts?  Suggestions?

Enio

Contributor

Registered: 2013-09-24

Posts: 175

Re: Purchased LF Antenna Read-only

Lf works best on 20V+
Hf on 10V+

Yours seems a bit low for 125khz.

Try

>lf read
>data samples 40000
>data plot

With tag on antenna. You ll see if you get a usable wave or if its too weak.

scott

Contributor

Registered: 2014-03-21

Posts: 14

Re: Purchased LF Antenna Read-only

It doesn't look completely garbled to me...

I haven't had any problem reading HID fobs or cards, just emulating them.

scott

Contributor

Registered: 2014-03-21

Posts: 14

Re: Purchased LF Antenna Read-only

It looks like the problem was a loose connection where the cable connects to the Proxmark.  It works fine now.