[AK-VHF] Radio Projects

[Brandon Clark]

That is indeed a big coil. What is it for?
Brandon

On Tue, Apr 21, 2020, 13:51 Edward R Cole <kl7uw at acsalaska.net> wrote:

> Almost all radio's from the 1920-40's were housed
> in wooden cabinets.  Lots of test equipment, too!
>
> The old saying "building a bread board" came from
> mounting components on real wood bread boards!
> Shielding of radio stuff did not start until post
> WWII when hams began to get complaints of TVI
> with the new TV sets that became popular in
> 1950's.  Most of them had copper chassis and
> wooden cabinets so poorly shielded.
>
> My early ham friends (1950's) worked in TV shops
> so I got see a few on the workbench.
>
> I made a huge loading coil from No. 12 house wire
> (stripped) and used a while plastic cutting board
> to make my form (photos attached)
>
> 73, Ed - KL7UW
>
> At 12:43 PM 4/21/2020, Brandon Clark wrote:
> >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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> 73, Ed - KL7UW
>    http://www.kl7uw.com
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