[Milsurplus] SCR-183 question

[William Donzelli]

> I believe that to be true.  More knowledgable people on the list may
> correct me, but I think most of the many letter distinctions in the
> SCR-(*)-183/283 were due to there being different
> contractor/manufacturers of basically the same gear.

That is how it was *supposed* to work. Those middle letters signify
variations at the implementation level that will not have any effect on
the system as a whole. In the SCR-*-183 series, the variations were tiny,
but in some other equipment (some power supplies) the variations were
drastic (not a single interchangable part) . If you were not inside the
radio fixing it, you could ignore the middle letters and just go by the
number. A BC-*-229 was supposed to work like any BC-*-229 to the operator
(or "outside world"). When things did change "externally", a new BC number
was assigned (BC-*-179 to BC-*-199 to BC-*-229 to BC-*-429). 
 
> What gets really confusing is all the tuning units whose nomenclature
> varied with the various models.  For example, the tuning unit for 201 to
> 398 kc and 2.5 to 4.7 mc is the C-439 for the SCR-AS-183, but C-379 for
> the SCR-AR-183.  That almost leads one to think that the coil from one
> set was not intended to be interchanged with the same range coil from
> the other set.

I think coilsets were matched to individual receivers, and they were not 
supposed to stray.

William Donzelli
aw288@osfn.org