[ARC5] Tuning Cable Question

[Geoff]

> 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

Did they originally simply use what was on most auto radios thru to the late 
30's? A dashboard or steering column mounted tuning head with 2 cables to 
the firewall mounted electronics box.

Carl


>
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