Sorry for reviving such an old thread, but I couldn't find any newer ones.
I was wondering if anyone has had any success with longer range antennas? What ranges were you able to achieve?
]]>Ok, I had really good experience by using miniscule coils manufactured here: http://www.coilcraft.com/
They even send you free samples.
One has to calculate what inductance is needed, for example I arrived at 1.4 mH for my proxmark to get to 130 Hz. They don't deliver exactly this inductance but I combined two coils with 0.7 mH each. The soldering can be a bit tricky, but it is certainly doable.
Pay attention to how the coils are arranged when soldering the antenna together so that the two induced voltages don't cancel each other.
The advantage of the small coils is that you can bring them close to car key even in the restricted space of your car. also they don't generate a large enough field to charge the key transponder on their own, which can confuse your proxmark triggers.
Since they look very similar to the key coil they are probably also useful to simulate a key tag, though I am not yet at that poiint.
Cheers!
]]>I am working on a project to replicate the actions of an RFID tag when it is scanned. In the sense that when it is scanned it performs an action ( creates small voltage to do XXXX ).
The frequency of the scanner antenna is 134khz and is 1.5 inch diameter. The power out is unknown at the moment to me and will have some degree of range. The scan reach is approximately an inch.
Currently I have reproduced another handmade antenna that does exactly what I want. But it is 1.5 inch diameter and I would like to shrink this antenna to .5 inches. I don’t have any real test equipment other than a multi-meter but the antenna will light an LED ( 1ma and 1.6v ) which is really all I need. Just want to trigger a solid-state relay. Overall goal is to have the most volts and amps that can be gained.
The current antenna is 1.5 inches using 39 awg wire with 70 turns which from an online calculator gives around 290uH. I have no idea how proficient this antenna is compared to a properly tuned one.
So to the help needed…
1) Can this program help me make and tune an equivalent .5 inch antenna?
2) How much better if any would it be ( power out) ?
3) Can you tell me approximately what wire size I would need to make this into a .5 inch antenna so I can go ahead and get it ordered or is it just a matter of using the same wire size with a different number of wraps.
If there are any questions or more information is needed I will try to answer them best I can.
Brian
]]>Meanwhile, you can edit first post and add [solved] in your subject.
This thread is done
I would like to construct something similar to the ProxClone Long Range Cloner, specifically targetting LF 125Khz, such as HID ProxCard II. I see on Alibaba etc. ads for an LF antenna that can allegedly read at 100cm, comparable to the HID MaxiProx 5375, but significantly cheaper (even when buying 2nd hand ones).
I'm a noob and RF and electronics, is it as simple as wiring the big antenna to the ProxMark3, or do you need an RF front-end designed for it (correct voltage, amps, and other characteristics etc.)? Would it be as simple as adding a some components or simple circuit to balance the impedance or similar (such as adding a cap or resistor or something) or is it a much more complex task. I've read on some forum (not sure if it was this one, and I can't find it now) that for a large and high power long range antenna you need much more powerful circuits and the ProxMark3 wasn't designed for it (cannot do it).
I'm tempted to buy a HSY-L08X, but to experiment with but I also don't want to damage my nice ProxMark3, could the antenna push too much power into the PM3 and damage it's components?
I've tried to study up on RF and antennae design but the more I read the more surrounding knowledge things seem to take, it's a complex subject. I've searched this forum and on google regarding this combination and found nothing. So if this post serves to draw peoples attention to it, or to answer that it's suitable or not, then it may help others.
Any help appreciated.
]]>The repo is here: https://github.com/Proxmark/proxmark3
Most RFID manufacturers have at least one white paper on the subject. I'd suggest starting there. Antenna design could leave you will a little less hair.
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