[ARC5] T22 transmitter

[Kenneth G. Gordon]

Peter:

I would strongly suggest you read these two PDFs which I have stored on my website:

http://www.w7ekb.com/glowbugs/Military/DaveStinsonARC-5Article.pdf

and

http://www.w7ekb.com/glowbugs/Military/DaveStinsonARC5Info.pdf

Ken W7EKB

On 7 Feb 2020 at 6:41, David Stinson wrote:

> Good Morning, Peter.
> I believe the work has been done, but I don't remember where
> may have seen it.  Frankly, I consider it "over-thinking the problem."
> I've run the rigs into spectrum analysers using the series-cap
> and found them very clean.  I don't think going to a more complex
> solution will yield a meaningful improvement.
> However- "each to his own" of course.
> 
> There is an active, long-standing "ARC-5" email reflector
> at arc5 at mailman.qth.net with some excellent people.
> For a broader milradio group, there are:
> 
> milsurplus at mailman.qth.net
> MMRCG at groups.io
> 
> GL OM ES 73 DE Dave AB5S
> 
> On 2/5/2020 9:35 AM, Peter Bertini wrote:
> > Hello Dave
> >
> > Has anyone ever come up with a more precise estimate for the T22 
> > transmitter antenna impedance?
> >
> > I have one that looks like it just left the factory, and I intend to 
> > get it on the air using you suggestions
> > to keep it original.  It is an extremely nice black wrinkle painted 
> > original,  with a lot of red factory labels.
> > I have to research its age and lineage.
> >
> > I've read the advice concerning a series cap to cancel the rotary 
> > inductor and link inductance... however
> > I suspect it would also be easy to tack in two high voltage micas to 
> > convert the rotary inductor into
> > a Pi matching network, which should give a better matching range and 
> > better harmonic suppression.
> > The caps could be easily removed by a purist in the future without 
> > affecting its value as an artifact.
> >
> > I am also looking for parts from junkers to restore several other 
> > transmitters and receivers, are they any
> > groups that cater to ARC-5 fanatics?
> >
> > Any thoughts?
> >
> > Peter W1BR
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