[AK-VHF] Radio Projects

[Tom Elmore]

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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