"Gareth Magennis" wrote in message
...


"Mike Tomlinson" wrote in message
...

Posted in another group:

http://imageshack.us/photo/my-images...tonowhere.jpg/

what are these tracks for?

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Long shot, but maybe a simple delay line, like you used to get in old
colour
TV's?


Gareth


Don't reckon you'd get much delay down a length of track like that, would
you ? And it seems to be open circuit at the end, anyway. The PAL delay
lines were a glass block with two transducers (lead zirconate titinate ??)
bonded to a pair of faces at a precision-cut angle. Early ones were a large
block with a single out / reflected path. Later ones were much smaller, and
the signal bounced around several times before exiting. Total delay, about
64uS or one UK line period. Luminance delay lines to compensate for the
difference in bandwidth and hence signal transmission speed between the
luminance and chrominance amplifiers, were only a few tens on nS I seem to
recall, and were made from very fine wire wound on a hollow glass rod. Could
those tracks that we're looking at on the photo be any kind of RFID receiver
or responder antennas for automatic inventory or production line process
control purposes ?

Arfa