KG6DV@cs.com sez--
>I have some motor driven air variables from a Kenwood AT-250 that with or
>without padding I intend to use with either an amp or antenna tuner. I
>remember seeing in an old QST or CQ magazine (very old 1970's) a formula
>used to estimate the value (pf) of air variables. Anyone know of a way I
>can approximate the value of these things. I can call Kenwood parts, but
>I would like to know a method of estimating these for when I find some off
>brand surplus or others.
ARRL handbooks have an equation that allows guesstimating the value of a
capacitor if you can measure plate number, area, and spacing.
Here's a URL for a fun tool I got:
http://www.aade.com/lcmeter.htm
It's a digital LC meter -- I got the kit, took me about an hour to put
together (my galfriends complain that I'm too fast), and I've been using it
a LOT the past few days. It's nice. The purveyor, Neil, is tuned into web
commerce and you can order online -- my kit arrived in like three days.
Read the reviews ... this tool is even better than they say! No, I don't
get a nickel for every one I sell.
Jim N6OTQ
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