[HBR] Re: HBR Digest, Vol 55, Issue 9

[Peter Bertini]

Haven't gotten that far into it, but I suspect the existing fiber rods
will be a bit short..

I was thinking of using Litz wire for the movable coil, but if I can
find small diameter
tinsel I'd consider using it.  It would be interesting to see what
Eddystone used
in their variable IF transformers.

Pete

On Mon, Sep 22, 2008 at 12:25 PM,  <match at ece.utah.edu> wrote:
> On 22 Sep 2008 at 4:02, Pete wrote:
>
>> I would replace the fiber rods with brass welding rod and use a rack
>> and pinion mechanism
>> to move the coupling up and down.
>
> That solves half the problem. The other half is that the wires on the top coil
> of the ARC-5 transformers will break after being moved a dozen times or so.
> If you want to persue this route, you'll have to replace the leads inside the
> transformers with some tinsel leads that will survive the frequent movement.
>
> Since the upper coils will be firmly anchored by your rack-and-pinion
> assembies, I'm not sure you'll need to replace the rods with brass. I think the
> fiber rods would survive if you remove the friction dogs that hold them in
> place.
>
> Marvin
> KA7TPH
>
>
>
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