[ARC5] Command Set Commonality

[J. Forster]

Sounds pretty reasonable. Each station preobably did 5 to 20 operations...
 enough to have a bit if variety and reduce handling overhead, but few
enough to avoid errors. Kinda after Gilbreath.

FWIW,

-John

==============



> It's just a guess from this end, but I sort of envision an assembly line
> at A.R.C. and the others where it was sort of akin to what was likely done
> at auto plants where the identical chassis rolls down the line and the
> specific parts for a contract were assembled at different spots on the
> line.
>
> The appropriate transformers and other common components would be placed
> at various work stations for installation and specific differing resistors
> and capacitors installed on a specific wiring line.  Not 100% commonality,
> but probably better than 70%.
>
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * k2gkk at hotmail.com *
> * Oklahoma City, OK *
> * USAF & FAA (Ret.) *
> * * * * * * * * * * *
>
>
>> To: arc5 at mailman.qth.net
>> Date: Fri, 11 Apr 2014 22:09:55 +0000
>> Subject: Re: [ARC5] Command Set Commonality
>
>
>
>
> From: J. Forster
>> Sent: ýFridayý, ýAprilý ý11ý, ý2014 ý5ý:ý08ý ýPM
>> To: Robert Eleazer
>> Cc: arc5 mail list
>>
>> Has anybody compared the chassis wiring of all the sets in a family to
>> see
>> if they are, in fact, identical to the component value level?
>>
>> -John
>>
>> ===========
>> Yes. Used to was be a site where a person did list differences between
>> ARC and SCR, at least, and I think some within each family. Of course
>> that was a couple of computers and a ‘few’ failed drives ago. It eluded
>> me last time I went looking.
>>
>>
>> The instruction book for the BC946b that was probably in the box does
>> enumerate the specific differences to the BC 453. Oddly this copy
>> doesn’t have an obvious manual number, was issued January 7 1943.
>>
>>
>> Signal Corps manual T. O. 12R2-3SCR274-14 (spare parts list radio set
>> SCR-274-N) does list the variants between types. A convoluted logic
>> system is used where the parts are listed by Item Number. A
>> cross-reference in back does list by schematic symbol leading you back
>> to the front. C4, for example has three listings, one for each Western
>> Electric part number.
>>
>>
>> The ARC 5 manual AN 16-30ARC5-2 does list all the variants for R23 thru
>> R27 as well as T15 thru T22.
>>
>>
>> > I dug out Gordon's "Command Sets for All Frequencies" article in the
>> Jan
>> > 67 issue of CQ to check on commonality for the sets.  Just as I
>> thought,
>> > here is what it shows for the C4, the tuning cap.
>> >
>> > 190-550 and 520-1,500 use the same tuning cap, max 346 pf.
>> >
>> > 1.5-3.0 and 3-6 use the same tuning cap, max of 147 pf
>> >
>> > 6-9.1, 9-13.5, and 13.5-20 use the same tuning cap, max of 62 pf.
>> >
>> > 20-27 uses a max 41 pf tuning cap.
>> >
>> > So, with the pluggable IF's, pluggable RF's and easily removable BFO
>> coils
>> > they could cover all the production models as well as most of the
>> special
>> > ones with just 3 tuning caps.   Darned clever!
>> >
>> > Wayne
>
>
>
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