On Sat, 29 Jun 2002, Spehro Pefhany wrote:

>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.

Okay, thanks.

>>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.

I was thinking of a manual control, for a start. I do not know what kind
of signals I can get (I live in a city that thinks RFI is a brand of
cheese - nobody cares about EMI filters and such). That's why I hope a
good preselector will help me. The signal on a whip is terrible even with
all the computers and other noisemaking machines shut down.

Peter

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