[ARC5] Tuning Cable Question

[Mike Hanz]

On 5/30/2014 1:04 PM, Robert Eleazer wrote:
> As we all know the tuning knobs for the earlier TRF radios like the RU and SCR-283 are larger than the ones used for the SCR-274-N and ARC-5 types.  As I found to my dismay when I bought a tuning knob in a store in San Diego many years ago, only to find it would not fit the radios I had.
>
> Is this because the TRF sets had more mechanical stuff to turn than the superhets and thus needed cables capable of handling the extra load?

If it were a function of load, wouldn't the inner phosphor bronze flex 
drive cable be larger in diameter than the ones in the command set 
drives?  (It's not...they are both ~.148"OD)  What is somewhat 
inexplicable is why the earlier cables had a larger diameter sheath than 
those for the command sets, and thus needed a larger connecting nut, 
which forced the spinner knob to be larger, and the knee bone is 
connected to the thigh bone, and....

> I guess that same kind of cable is used on the ARN-6 as well.

As well as all the Bendix control boxes.

  - Mike  KC4TOS