betomo wrote:is it possible to modify a commercially available mobile phone jammer to jam RFID tags?
as I understand a phone jammer works by sending static signals that overpower the mobile phones in the vicinity, thus rendering them unusable. Mobile phones work in the range of 850 to 2200 Mhz
Could the frequency of the jammers be modified as to work in the range of 30-300khz, 3-30mhz, 300mhz-3Ghz and 2-30 Ghz?
Would this disable the operation of any RFID tags in the vicinity?
How could you do that?
aqisnotliquid wrote:If a commercially available RF jammer has a built-in PLL system, with a bit of hardware/software hacking you -should- be able to reset the frequency range (provided that the actual VCO in the device supports that range). However, if the device is built to block cell phones and only cell phones, I think the only option you have is to replace the VCO with one of the right frequency.
Here's a table of different VCO's offered by MiniCircuits with their frequency range:
Also, the generic frequencies for RFID are:
125 - 134 kHz
UHF (400 – 930 MHz)
So your best bet (if you want to block all RFID) is to either build a Wave Bubble or find another RF jammer that includes a PLL that you can use to set the range of the VCOs.
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