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Re: I didn't know this. Or why Proofreaders are needed. Or They've been lying to us....
I attended a retail EDI/B2B seminar recently and the consultant
mentioned RFID checkout trials to get rid of queues/lines at the
checkout by using RFID tags on all items. You load your trolley in
the store and walk past a scanner and are presented with a bill for
everything in the trolley. It's a nice idea; no unloading and re-
loading the trolley at the checkout.
Unfortunately (for the supermarkets) the trials demonstrated that if
you line your (metal) trolley with cheap canned goods and other
cheap metal goods like baking trays, you don't get charged for the
caviar and champagne that you've carefully placed in the middle of
the trolley.
If the signal can't reach the checkout desk, I don't they're going
to be read by satellite (yet).
Ian.
--- In Mike Rawlins <mcr2@r...> wrote:
<various bits snipped...>
> For instance, low-frequency tags use
> less power and are better able to penetrate non-metallic
substances. They
> are ideal for scanning objects with high-water content, such as
fruit, but
> their read range is limited to less than a foot (0.33 meter).
> High-frequency tags work better on objects made of metal and can
work
> around goods with high water content. They have a maximum read
range of
> about three feet (1 meter). UHF frequencies typically offer better
range
> and can transfer data faster than low- and high-frequencies. But
they use
> more power and are less likely to pass through materials. And
because they
> tend to be more "directed," they require a clear path between the
tag and
> reader. UHF tags might be better for scanning boxes of goods as
they pass
> through a dock door into a warehouse.
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