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Wanting to design a LF antenna for the RDV4 platform (since that's what I bought) but I'm not sure what's up with the three terminal antenna connection. Did a quick test with a multimeter and only the PWR and RAW ports have continuity on the antenna.
Last edited by HAMsandwich (2018-11-02 08:34:30)
In contrast to previous designs, the capacitor of the RLC circuit is not on the Proxmark3 Rdv 4.0. Now, it is part of the antenna (pcb).
To be able to add a capacitor the Proxmark3 Rdv 4.0 features the GND terminal.
The simplest antenna possible is a coiled wire connected to PWR and RAW and a capacitor between RAW and GND.
Last edited by AntiCat (2018-11-01 22:07:08)
Figured it out, thanks to AntiCat, and got something thrown together for coupling to small implantables. ~150pF of bulk capacitance with 10-50pF of trim capacitance and I estimate a 10mH ferrite inductor I had laying around. Now to figure out my protocol issues...
Measuring antenna characteristics, please wait.........
# LF antenna: 66.41 V @ 125.00 kHz
# LF antenna: 40.42 V @ 134.00 kHz
# LF optimal: 66.41 V @ 125.00 kHz
# HF antenna: 0.00 V @ 13.56 MHz
# Your HF antenna is unusable.
Displaying LF tuning graph. Divisor 89 is 134khz, 95 is 125khz.
Last edited by HAMsandwich (2018-11-02 08:24:12)