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Can someone let me know if I have a proper understanding of how the Proxmark3 analog RX path works?
When the PM3 is acting as a reader and it wants to demod the data sent to it via a real tag it uses the envelope detected and filtered signals LOPKD and HIPKD.
When the PM3 is acting as a tag and it wants to demod the data sent to it via a real reader it uses the envelope detected and filtered signals LOPKD and HIPKD.
When the PM3 is "sniffing" both a real reader and real tag it uses the direct amplified signals LORAW and HIPKD.
Does that sound right to you guys? Trying to understand the HW better.
Thanks for reading.
(*Found a TYPO)
Can someone let me know if I have a proper understanding of how the Proxmark3 analog RX path works?
When the PM3 is acting as a reader and it wants to demod the data sent to it via a real tag it uses the envelope detected and filtered signals LOPKD and HIPKD.
When the PM3 is acting as a tag and it wants to demod the data sent to it via a real reader it uses the envelope detected and filtered signals LOPKD and HIPKD.
When the PM3 is "sniffing" both a real reader and real tag it uses the direct amplified signals LORAW and HIRAW.*
Does that sound right to you guys? Trying to understand the HW better.
Thanks for reading.
Found my answer so I thought I would share:
The PM3 typically only uses the envelope detected signals LOPKD and HIPKD for all modes.
The squaring operation of the envelope detector translates the carrier to DC leaving the sub-carrier to be sampled and processed by the A/D and FPGA.
Thanks for reading.