On 24 Oct 2008 at 21:24, Tony Duell wrote:
I just
want to mention that there were polar-coordinate tubes. They may be
Interesting,. I'd not heard of those before. I will have to try to find
some data sheets, etc.
I don't recall them being mentioned in the ook 'CRT Displays' (part of
the Radiation Lab series), but I may well have missed them.
Weren't they used for radar displays?
That's why I mentioned that book. The 'Radiation Lab Series' is. IMHO a
classic set of books on radar and related technologies. I don't have all
the volumes by any means (I think the full set is 28 books), but those I
have are certainly worth reading.
And I can't see how to make a polar deflection CRT either. I can think of
plenty of ways (electronically or electromechanically (e.g. by rotating
a defleciton coil around the CRT)) to do it with a normal-ish CRT, but I
can't immediately think of a set of coils and/or plates where one applied
signal give the radius and the other the angle of rotation.
I did wonder about a longtitudinal magnetic field, like the 'trace
rotate' coil in some 'scopes. But you can't get a full revolution from
that, and I think it has some effect on the defelction senstivity.
-tony