"David Edmonds" wrote in message
...
Airy R.Bean wrote:

I wonder if there is any mileage to be had from adapting
the numerous junk-mail CD's as the vanes of ATU
capacitors?

So you've given up on using them to make 30 line television systems then?

Do a web search about this - plenty of info - though you claim you don't
web search.

Superficially the idea has some merit but you would have to machine the
discs anyway (they are totally symetrical and thus the area overlapping with
the fixed vanes wouldn't change). By the time you've machined then to be
asysmetric, might as well have made metal plates and avoid all the other
problems as well.

To problems in making variable Cs, the use of a CDROMs offers little.

Etching plates on PCB and using the fibre glass for the mechanical side is
maybe a better idea.

--
Brian Reay
www.g8osn.org.uk
www.amateurradiotraining.org.uk
FP#898