At 12:40 PM 6/29/02 +0300, you wrote:

>You seem to know the 'good old ones'. Do you happen to know where one
>could get some surplus motor-tuned air variable caps ?

No idea, I'd start at my two favorite surplus places that carry this
sort of thing:

C&H Surplus in Pasadena: http://www.candhsales.com
Toronto Surplus in TO:   http://www.torontosurplus.com

Neither place gives stuff away, but they might have something like
that around. I don't buy a lot of surplus, only get to each once year or
so.

>I have no info on
>this at all and I am toying with the idea of making myself a remote tuned
>antenna preselector. I have also considered building one out of ganged air
>variables and a carrier current remote control. I have a precision dc
>servo to turn them (1:500 backlash free gears).

Sounds like it would work very nicely. You're right to be concerned about
backlash if you are going to be automatically tuning it, backlash is
a major nasty when it comes to designing the controller.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
9/11 United we Stand

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