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#1 2011-08-31 11:07:32

cormas
Member
Registered: 2011-07-25
Posts: 5

Antenna 125Khz strange behaviour !

I made 2 different 125 khz antennas.

In reading there are no  problem but i have problem with the emulation with command
lf em4x em410xsim 29006f1059

This antenna have better parameter (23,77v) but  doesn't work in emulation

# LF antenna: 23.77 V @   125.00 kHz   <---------------------
# LF antenna: 21.89 V @   134.00 kHz
# LF optimal: 26.45 V @   127.66 kHz
# HF antenna:  9.76 V @    13.56 MHz

 
This antenna is worst but work in emulation (10,34v)

# LF antenna: 10.34 V @   125.00 kHz     <------------------
# LF antenna: 16.38 V @   134.00 kHz
# LF optimal: 24.71 V @   141.18 kHz
# HF antenna:  9.76 V @    13.56 MHz

LF-antenna

So I want to know your opinion about this  strange behaviour ..

this is my portable PROXMARK with size of card and double antenna (125khz & 13mhz)

BOX1
BOX2
BOX3
BOX4
BOX6
BOX7

Last edited by cormas (2011-08-31 11:23:17)

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#2 2011-08-31 18:43:53

spinoinside
Member
From: Italy
Registered: 2010-02-06
Posts: 14

Re: Antenna 125Khz strange behaviour !

Nice cormas wink

i'm think your problem is a different version of the client and core

Last edited by spinoinside (2011-08-31 18:45:18)

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#3 2011-08-31 21:15:12

cormas
Member
Registered: 2011-07-25
Posts: 5

Re: Antenna 125Khz strange behaviour !

spinoinside wrote:

Nice cormas wink

i'm think your problem is a different version of the client and core

I am not agree because version of client and core are always the same ... I just change antenna and the worst work instead the other doesn't work also if it has the beter parameters

proxmark3> hw version
#db# Prox/RFID mark3 RFID instrument
#db# bootrom: svn 486-suspect 2011-07-11 02:33:09
#db# os: svn 486-suspect 2011-07-11 02:33:22
#db# FPGA image built on 2009/12/ 8 at  8: 3:54

the bin of client is r486


PS: ciao Andrea

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#4 2011-08-31 21:26:50

cormas
Member
Registered: 2011-07-25
Posts: 5

Re: Antenna 125Khz strange behaviour !

I made other test so I modify the antenna that I called worst  (this was parameter:

# LF antenna: 10.34 V @   125.00 kHz     <------------------ 10,34
# LF antenna: 16.38 V @   134.00 kHz
# LF optimal: 24.71 V @   141.18 kHz
# HF antenna:  9.76 V @    13.56 MHz )

I add some coils to have a beter signal so now the antenna has this new parameter and it doesn't  work anymore in simulation

# LF antenna: 21.75 V @   125.00 kHz   <-----------------------21,75
# LF antenna: 19.87 V @   134.00 kHz
# LF optimal: 24.57 V @   127.66 kHz
# HF antenna:  9.73 V @    13.56 MHz


Can  I think that beter is signal and worst is the functionality in simulation ??????
1) Tha size of antenna is the same
2) The version of PROXMARK is the same
3) the LF FEED is always the same

PLEASE IF  YOU READ THIS POST CAN YOU TEST THE COMMAND "lf em4x em410xsim 29006f1059" AND SEND THE OUTPUT
OF YOUR "hw tune" !

Thank you

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