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#1 2008-09-03 12:34:28

newseal
Member
Registered: 2008-08-24
Posts: 14

help me for achieve an antenna

hi,   
I would like to have information to achieve the antenna to operate "proxmark III".
-- Draw
-- Schematic diagram
-- BOM
thanks,

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#2 2008-09-05 19:33:14

rule
Administrator
Registered: 2008-05-21
Posts: 416

Re: help me for achieve an antenna

I have promised a few people now that I will make a few HOWTO pdfs.
Which contain describe:
- Making a simple antenna
- Flash your proxmark the first time (through JTAG)
- Set up the compiler environment for starting to program

These HOWTO's should become available within a few weeks. But any help will appreciated.

Cheers,

  Roel

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#3 2008-10-13 19:33:56

theqlabs
Member
Registered: 2008-10-07
Posts: 10

Re: help me for achieve an antenna

Hi guys,

Just to let everyone know who is interested. This weekend I will be working on "How to design and build an antenna for the Proxmark 3 device" for this community. - I will be building a bunch of them for some clients so I can take pictures and write down all of the crazy RF equations that I love, hehe.

I will post it on the forums when it is done! If anyone wants to help, shoot me an e-mail !

Cheers,

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#4 2008-10-28 13:45:36

rule
Administrator
Registered: 2008-05-21
Posts: 416

Re: help me for achieve an antenna

Did you ever accomplished to make this howto? I saw some questions around about making an antenna. If you have it, you can upload it to the files section so I can put it online.

Cheers,

  Roel

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#5 2008-11-02 08:27:12

rf_hack
Contributor
Registered: 2008-08-20
Posts: 16

Re: help me for achieve an antenna

Here is a public paper on how doing antennae :

http://ww1.microchip.com/downloads/en/A … 00710c.pdf


This is far too complex using this paper for doing antennae but at least it can help some people to understand the principle.

On my side, for a reader, a 4 turns antenna (3x3cm antenna), or 3 turn antenna (4x4cm antenna) is good enough to do the antenna of about 1µH +/-0.3µH. Then after this is just a tuning job with capacitors. Q factor can be adjusted with a parallel capacitor to the coil

For a card antenna, this is depending on the capacitor integrated in the chip but most of the time, the coil is around 3-4µA

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