{apologies, I just dropped in to this conversation}
I was involved in the animal tracking industry 10 years ago (AWA data systems),
and we were looking at interfacing to a system using embedded passive RF chips
made by a firm in palmerston north. The original work had been done by the thin
film labs of DSIR and it had been turned commercial in the hope of creating a
marked similar to the pig tracking system developed by the dutch. I dont recall
the name of the company and havent followed its fortunes, but I know that it
used a passive embedded thin film chip which was irradiated by a RF source
scanner, which provided the energy for the chip to 'chirp' back a unique rf
code sequence.
regards
Leo
Terry Johnson wrote:
> I know the tag side fairly well, but I don't know any hand held readers
> (but they must exist).
>
> There are several technologies available, from the older 150kHz active and
> passive tags through to the microwave stuff that has been developed to be
> read on trains passing a reader at 300km/h!
>
> Technology considerations are read range, whether you need multiple tags
> readable concurrently (identify a handful of tags at once) and power
> consumption/tag life.
>
> Regards,
> Terry
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