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#1 2012-12-05 14:38:09

C0Y0-Ck3r
Contributor
Registered: 2012-11-08
Posts: 87

My hf antenna

Hey I have this without a tag on the pm3 :

proxmark3>

# LF antenna:  0.00 V @   125.00 kHz
# LF antenna:  0.00 V @   134.00 kHz
# LF optimal:  0.00 V @ 12000.00 kHz
# HF antenna: 15.63 V @    13.56 MHz
# Your LF antenna is unusable.

and this with a 14b tag on it :

proxmark3>

# LF antenna:  0.00 V @   125.00 kHz
# LF antenna:  0.00 V @   134.00 kHz
# LF optimal:  0.00 V @ 12000.00 kHz
# HF antenna: 12.31 V @    13.56 MHz
# Your LF antenna is unusable.

so what do you think is it a good sign ?

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#2 2012-12-05 15:13:26

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

Re: My hf antenna

That is normal, the tag absorbs some the power from the field.

Could you tell us more (show) your antenna design. The values you have (15+ v) are pretty good for an HF antenna.

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#3 2012-12-05 15:20:12

asper
Contributor
Registered: 2008-08-24
Posts: 1,409

Re: My hf antenna

Wow ! I reach only 10V with my HF antenna (and 36V with my 125kHz); can you please post pictures of your antenna ? Is it do-it-yourself or you bought it ?

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#4 2012-12-05 15:47:02

C0Y0-Ck3r
Contributor
Registered: 2012-11-08
Posts: 87

Re: My hf antenna

the secret about is from laser topic : How to make a 13.56MHz antenna
its all there I just reproduced what he said.
Thanks to you laser.

P.S : But I find a problem reading 14b, it gives some 444444 and crc failed, what is it about ?

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