[Lowfer] Question on building homebrew variable caps...

Mon, 11 Nov 2002 11:16:25 -0500

consider a set of fixed cap plates separated by glass plates
now sliding the glass in and out between the plates will make 
the cap vary. Advantage would be a cap with good mechanical 
properties and no worry about lossy ( resistive ) joints
the cap components wouldnt have to move,,, just the dielectric
to change the capacitance

Bob  K3DJC 

On Sun, 10 Nov 2002 22:27:58 -0600 "WE0H" <[email protected]> writes:
>Dang, I never thought of that. Thanks, now that cap should be easier 
>to
>build.
>
>Mike>WE0H
>http://www.we0h.us/lf.html
>
>-----Original Message-----
>From: [email protected] 
>[mailto:[email protected]]On
>Behalf Of Bill Ashlock
>Sent: Sunday, November 10, 2002 9:55 PM
>To: lowfer
>Subject: Re: [Lowfer] Question on building homebrew variable caps...
>
>Mike,
>
>>I would like to know if anyone has built variable capacitors for
>>transmitters or tuners. I would like to build a variable capacitor 
>that is
>>at least 100pf and can handle 40 amps of RF current.
>
>How are you figuring 40A in a 100pf capacitor? If this trimmer is part 
>of
>7000pf total resonant capacity for the loop the current would be 
>divided in
>proportion to the capacity. 100pf/7000pf x 40A = .57A.
>
>BillGet more from the Web.  FREE MSN Explorer download :
>http://explorer.msn.com
>
>
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