[AK-VHF] Radio Projects

[Brandon Clark]

That's a very cool project. And you're right, you don't see a lot of tuners
with a wooden box. It's interesting though how little the fundamentals have
changed: if you have a coil and a capacitor then you can tune antennas,
whether you're in 1920 or 2020, lol.

What are your plans for the tuner?
Brandon


On Tue, Apr 21, 2020, 11:58 Tom Elmore <tom at telmore.com> wrote:

> Brandon, Since you were sharing.
>
> I Picked up this antenna tuner from ebay recently because I thought it
> looked interesting but who makes a tuner out of wood. I’m guessing the
> thing
> is from the 40’s or 50’s judging by the antenna current meter. The plugin
> coil assembly fell apart during shipping but to be fair the little plastic
> strips that hold the coils in place have all shrunk and the glue dried up I
> see this a lot on these types of air coil forms. I decided to rewind them
> so
> I turned a piece of Teflon 2 ½” in diameter to re-wrap the wires around to
> act as a master form on the lathe. I also wanted to remake the little
> strips
> that go inside the coils to keep the coils spaced. What I did was take
> another piece of 2 ½” diameter x 2 “ long Teflon solid round stock and
> threaded it at 11 threads per inch. I figured out with a thread gauge
> holding it over a slightly still intact coil that it was about 11tpi. I
> then
> bored out the entire Teflon piece until I add about .100 of material left.
> I
> then took that whole form and cut ¼” strips the length of the form that
> were
> threaded and help keep the wire in place. I placed 3 strips around the
> outside of the master form and then wrapped the wire over the strips in the
> grooves I cut while threading. I then used clear JB weld to hold the little
> strips in place against the wire . When the epoxy cured I slipped the coil
> assembly off the master form. What I ended up with looked like the original
> did and I suspect this is probably how they did it in the factory more or
> less.
>
> -----Original Message-----
> From: ak-vhf-bounces at mailman.qth.net [mailto:
> ak-vhf-bounces at mailman.qth.net]
> On Behalf Of Brandon Clark
> Sent: Tuesday, April 21, 2020 9:15 AM
> To: AK VHF+ Group
> Subject: [AK-VHF] Radio Projects
>
> Hello group,
>
> I've been tied up with moving, but am now getting back to working on radio.
> If you're on FaceBook, search for me and you can see the photos of a J38
> key
> that I just finished restoring. The metal work is better than new, and I
> replaced the bakelite base with a stone one made from a floor tile. (Now I
> just have to finish learning the code <sigh>)
>
> I have also shared a few photos on the club FaceBook site as well. If you
> have been working on any projects lately and would like to share then with
> the group I'm happy to post them online. Things like that are great for
> outreach. More importantly, being able to see how experienced hams set up
> equipment is really useful for new hams that are looking for guidance.
>
> So if you've been working on something fun, take a few photos and send them
> to me off-list. I'll get them posted up online.
>
> 73,
>
> Brandon
>
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