[HBR] 3-section air variable

[seibold at trainride.com]

I haven't looked at HBR stuff in a long time. A better bet for you might be a Mallory Inductuner from Fair Radio Sales.  These were widely used for HF VFOs by strapping all 3 sections together.  If you use the search term air variable capacitor in Google you will find a bunch of the size you are seeking.

73

Fred W9FWS

-----Original Message-----
From: "Paul Dulaff" <pdulaff at embarqmail.com>
Sent: Friday, August 3, 2018 9:57am
To: "HBR Receiver List" <hbr at mailman.qth.net>
Subject: Re: [HBR] 3-section air variable


Took a look and did not see a 3 to 25 pf   3 section capacitor typically used on HBR's. Is there a link somewhere on the site for these ?

Paul - W2NMI

----- Original Message -----
From: seibold at trainride.com
To: HBR Receiver List <hbr at mailman.qth.net>
Sent: Fri, 03 Aug 2018 10:45:36 -0400 (EDT)
Subject: [HBR] 3-section air variable

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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