Re: need a LOONG delay line

In article <Fy6Fg.5891$w3.3045@xxxxxxxxxxxxxxxxxxxx>,
no.spam.for.me@xxxxxxxxxxxx (colin) wrote:

*Subject:* need a LOONG delay line
*From:* "colin" <no.spam.for.me@xxxxxxxxxxxx>
*Date:* Thu, 17 Aug 2006 23:00:53 GMT

Hi,
Im looking for a long delay line of about 10ms wich can handle a 10mhz
sinewave.
size is not too important as long as its able to be mobile,
a quick calculation reveals I would need about 2000km of cable,
wich means its probably far too expensive to do it this way, although
I only
need 1.
One idea I had was to re circulate the signal many times shifting it
up in
frequency each time,
im not sure if this could be done with just one mixer,
any ideas ?

other methods of delay such as digisation etc are not suitable.

Colin =^.^=



there is a form of tank depth gauge which uses very fine wire wound onto
a 2" or so former. Off hand I can't recall the ping time we got from 10
feet of it, but it was much slowed down.

your problem is the 10MHz I'd think - digital would be a much better
route, but 50ns samples means hard-wired logic not a processor.

David


.

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