[HBR] 3-section air variable

[seibold at trainride.com]

http://www.stormwise.com/page3.htm

Find yourself a Jackson Bros (English firm) 5:1 drive for easier tuning

Fred Seibold W9FWS
First 'Phone back when there was one....

-----Original Message-----
From: "J Ed" <jedwardsat1 at gmail.com>
Sent: Thursday, August 2, 2018 10:53pm
To: hbr at mailman.qth.net
Subject: [HBR] Hello

Hi all.

I'm Ed, AE7TE, and I'm interested in building an HBR.

One of the issues I foresee is getting the capacitors. Namely, the
three-section tuning cap. I have thought of building a trombone
capacitor made of brass tubing and a screw mechanism. I'd have to come
up with a way to link it to a tuning shaft - if I used a 2 inch travel
actuated by an 8-32 threaded rod, that would mean 64 turns for full
meshing. It could be possible to reduce it to 8 turns with clever
mechanical arrangement.

I'd also have to make my own IFTs. That's not hard, but needs care.

Ed AE7TE
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