[ARC5] T-17 on eBay crying in my beer

[Mike Hanz]

In order to increase the inductance of the T-15/ARC-5 antenna tuning 
coil, ARC designed it with the normal outer ceramic form and an internal 
*coaxially mounted* cylindrical phenolic form that had additional turns 
in series with the ceramic coil.  In effect it was a fixed inductance in 
series with a variable inductance.  It was augmented with the TN-6/ARC-5 
antenna loading coil shown at http://aafradio.org/flightdeck/arc5-10.jpg 
to provide matching with a wide variety of possible aircraft antennas.  
That is the reason I mentioned it being unique to the T-15...a fact that 
was probably overlooked by the modifiers of these sets back in the day.

- Mike

On 8/2/2014 9:40 PM, Kenneth G. Gordon wrote:
> Mike:
>
> You said something about the T-17 roller coil being "unique" and "double
> layer"...or something like that.
>
> >From one of Mike Bittner's photos, I count 60 turns on the roller inductor, but
> cannot see a second layer.
>
> What did you mean about that coil? Or are we talking about a different one?
>
> Ken W7EKB