[ARC5] Tuning Cable Question

[WA5CAB--- via ARC5]

AFAIK, the larger spline was used on everything that flew and used tuning 
cables except for the Type K derived sets.  No one seems to know why the 
small sets used the small spline.

Robert D.

In a message dated 05/30/2014 17:10:03 PM Central Daylight Time, 
aaf-radio-1 at aafradio.org writes: 
> 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