> Microchip app note AN710

I have that and will go through it. Was the magnet question I needed
an answer to. Only occurred to me because I happened to be working
with a Hall Effect sensor and used a small magnet as a flux concentrator,
leading me to wonder if that would also 'focus' an electro-magnetic field

> **If** the plane of your tag **coil** is almost perpendicular to the
> plane of your "pickup" coil you have near worst case orientation

Fortunately, although moving, the Tx-Rx can be in a fixed, optimised,
spatial relationship as they move together, coupled magnetically, hence
another reason to ask

(Magnets. Always with the magnets)
--=20
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