The device being referred to here is an in-car mounted identification
tag that effectively transmits an identification signal when passing through
a detector on a new privately owned freeway in Melbourne.
From: Joanna Richardson@TRANSURBAN
05/18/99 09:35 AM
Alan,
Thanks for your note. Our operations team
supplied the following information with regards to your query:
Frequency of tolling equipment: in the
5.8 GHz region
RF power: max +33dBm from fixed transmitter.
The e-TAGs reflect transmitted carrier, and are not stand alone transmitters.
Modulation: AM from fixed transmitters;
DPSK from e-TAGs.
I hope that's helpful. Thanks again for
your interest. Yours sincerely,
Joanna Richardson