Thanks for the reply!
I was very focused on aiming for the center of the antenna, but as it turns out the best spot for the HF antenna seems to be here:
Yes, you will need a 1.5mm hex driver to remove the 8 screws (six on the top, two on the bottom) and a small pair of pliers helps to remove the six standoffs. You will leave the four screws on the back below the LF antenna and the lower four standoffs below the LF antenna. Then you will put the LF antenna back with the three arrows on each side pointing to the middle of the board.
No, but I am tempted to get a second “LF board” made up and mount a hand wired ferrite coil on it as an alternative option, or make a full length clear “board” for protection of the Proxmark3 with a LF antenna coil off the bottom.
I think I just used the four from the HF end to hold the LF antenna board on. No shortening and they worked. I can’t guarantee that ours were made in the same place though, so manufacturer differences?
That’s how it was for me as well. The short screws were from the HF side. Since the LF side uses 2 standoffs instead of 1, the screws can be longer. On the HF side, you’re putting 2 screws in a single standoff, so one of them has to be shorter in order to have enough room for both.
What I ended up doing is just using both standoffs on the LF side and not bothering with a screw on the top. That keeps everything tight and secure, and gives the LF antenna some protection if I were to drop the PM3 or something.
No, redesign it so that the HF is on the back of the board, then put the LF coil on the front where the HF currently is, now all of the sticky out bits are on one side. Then encapsulate the front in resin like the chameleon tiny, and Bob’s your uncle.
Sure it would need a lot more work, but you could sell it as the Proxmark3 Easy Slim.
I ended up putting the middle board back on today while playing around with stuff and discovered that I get approximately a 5V difference from HW Tune between the two formats. The middle board (presumably due to the separation) increases the LF Voltage by roughly 5 volts.