[ARC5] [ART-13_Transmitters] ATC/ART-13 Maintenance Autotune Crank

[Mike Hanz]

Except for the fact that, according to K3HVG, the longer screw that he 
pictured on the MRCA reflector had the wrong thread to fit the ART-13 
line shaft, I would be sympathetic with your speculation, John. O:-)

(This refers to a photo of an original tool that K3HVG found in a bag 
with two screws, one longer than necessary to provide the correct 1/4" 
engagement required for the the ATC/ART-13.)

I for one would not depend on a disengagement schema that did not have a 
positive stop in the two positions (engaged and not engaged), but YMMV...

On 3/31/2013 8:05 PM, J. Forster wrote:
>
> Seeing the print, I am now convinced the longer screw is to allow the
> crank to be disengaged, without fully removing it.
>
> YMMV,
>
> -John
>
> =========
>
> > Under the "tilting at windmills" rubric, I thought perhaps a web page
> > dedicated to the lovely and popular ATC/ART-13 maintenance autotune
> > crank might be in order. If one has a home machine shop or friend with
> > one, they could easily make it from the fabrication drawings I sketched
> > up from an original crank (grateful thanks to AB5S) at
> > http://aafradio.org/garajmahal/ART-13_lineshaft_crank.html
> >
> > I've made a couple of them for friends (out of stainless steel rather
> > than the original Type I cadmium plated steel because I prefer the look
> > and feel of stainless), and they aren't difficult to make. It's a nice
> > Saturday morning project. I added a knurled thumbscrew with a 4-40
> > thread to make it easier to attach to the end of the line shaft. It
> > eliminates twiddling with a screwdriver, though not the danger of loss
> > through Murphy's efforts. I keep it tied to the crank with a nut when
> > I'm not using the crank. That way only the nut gets lost when you're
> > using it....:-)
> >
> > 73 and Happy Easter,
> > - Mike KC4TOS
> >
>
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