ISO 11785 - Animal ID Technical Concept

www.iso.org/iso/en/CatalogueDetailPage.C...2=40&ICS3=99

I have been studying this standard (ISO11785) and I have some doubts about how FDX transponders should work.

In this standard there is a note that makes reference to a sub-carrier, containing the phase encoded data signal (binary 1:180° phase shift; binary O:no phase shift). In the figure that shows the signal structure of the identification telegram it seems that this PSK modulation does not exist.

Also reading in other references such as the RFID HANDBOOK written by KLAUS FINKENSELLER he describes modulation for this type of transponders in the following way: "... a load modulation procedure without a subcarrier is used, whereby the data is represented in a differential bi-phase code (DBP). The bit rate is derived by dividing the reader frequency by 32. At 134.2 kHz the transmission speed (bit rate) is 4194 bit/s."

In conclusion the question is if it exists or not a subcarrier PSK modulation for FDX transponders? <br><br>Post edited by: prolando, at: 2008/02/12 20:28

<br><br>Post edited by: prolando, at: 2008/02/12 20:31