DoNcK

Member Since: November 4, 2016

Country: France

  • To achieve longer range than my previous NFC equipment I ordered the following:

    • a 125kHz ID-20LA RFID reader (SEN-11828)
    • an RFID USB board adapter (SEN-09963)
    • a 125kHz card (COM-08310)

    I could read the cards at 8cm maxium ONLY (using a powered USB hub with nothing else connected to it) while the product description claims a 180mm range ! Actual range using matching Sparkfun parts is about half of the claimed range... I was very disappointed !

    Later I found this comment from Sparkfun stating that ID-20LA Readers have a 2.75" range maximum using the cards (maximum range is achieved with the cards)

    Why not stating that instead in the product description ?

    To get a better understanding, I read the datasheet from ID-Innovation and it seems that the design of the USB board is pretty bad to achieve long range: Section 17 advises not to put a copper ground plane nor noisy power supply tracks under the module. The USB board has a wide copper plane and the FTDI USB chip...

    Connecting the module to the board using wires (pin 1, 2, 11 and 10) and I could get a little 2 or 3 cm range increase which is significant but still far below expectations.

    The datasheet also warns very clearly that power supply requirements are pretty demanding for long range and strongly advises using a regulator based power supply with a voltage ripple of less than 3mV PKPK (recommenging using a ZLCL400 regulator). The USB boards schematics show that the module is fed from the USB 5V without using a regulator !

    So I tried powering the module directly from a regulated power supply. Range did not increase both in 3.3V and 5V voltages. Same results when I tried to feed the USB board from that power supply.

    I guess this module requires a better power supply to achieve desired range. To be continued !

No public wish lists :(