Can a smartphone transmit/receive 125KHz?

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Discussion Overview

The discussion revolves around the feasibility of using a smartphone to transmit and receive 125KHz RFID signals, particularly in the context of an electrical engineering final project. Participants explore the hardware capabilities of smartphones in relation to low-frequency RFID technology.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires whether smartphones have antennas capable of handling 125KHz RFID signals, noting the existing capability for NFC at 13.56MHz.
  • Another participant suggests that while it might be theoretically possible, they do not expect smartphones to operate effectively below 10MHz due to antenna design differences.
  • A different participant asserts that no common smartphone antenna can support 125KHz, but mentions the option of using an external 125KHz RFID reader/writer connected via USB.

Areas of Agreement / Disagreement

Participants express differing views on the hardware capabilities of smartphones regarding 125KHz RFID. There is no consensus on whether smartphones can directly handle these frequencies, with some suggesting alternatives like external devices.

Contextual Notes

Participants do not provide definitive evidence or references for their claims, and the discussion lacks detailed technical specifications regarding smartphone antennas and their frequency capabilities.

YanivW
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As part of my final project in my EE studies I was thinking if it is possible to read 125KHz RFID tags with a smartphone. I know it is possible with NFC (13.56MHz) and I was thinking about implementing a 125KHz reader. Is there any antenna in a regular smartphone that can deal with these low frequencies? I'm not talking about rather it is possible to use it for this purpose, but just to know if the required hardware exists.
Thanks! :smile:
 
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YanivW said:
As part of my final project in my EE studies I was thinking if it is possible to read 125KHz RFID tags with a smartphone. I know it is possible with NFC (13.56MHz) and I was thinking about implementing a 125KHz reader. Is there any antenna in a regular smartphone that can deal with these low frequencies? I'm not talking about rather it is possible to use it for this purpose, but just to know if the required hardware exists.
Thanks! :smile:
What have you found with your Google searches so far?
 
YanivW said:
I'm not talking about rather it is possible to use it for this purpose, but just to know if the required hardware exists.
It might, but I would not expect a phone to work below 10MHz. There will be a big difference between the small antenna needed on a UHF mobile phone and the wire loop antenna that would be needed for a 125kHz RFID tag.
 
There is no antenna in any common smartphone capable of that. On the other hand you could connect a cheap external 125kHz RFID reader/writer to the USB plug of an android phone.
 

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