[Milsurplus] Question about SCR and AN nomenclature

[Edward Greeley]

John -

The official name of the "AN" system of electronic equipment type 
designators is the Joint Electronic Type Designation System, or JETDS. 
JETDS is covered exhaustively in MIL-STD-186E which can be found at 
http://ed-thelen.org/MIL-STD-196E.pdf. That is the current, official DOD 
prescribing standard. The various mildeps also have regs and manuals 
that implement the mil-std. The mil-std tells you more than you probably 
ever wanted to know about the subject, including the history of JETDS.

The situation vis-a-vis the old SigC system (SCR, RC, etc) is much more 
obscure. Doing a Google search on "scr signal corps" brings up a 
gazillion hits, none of which seem to be "official" as to its genesis, 
history, etc.

And BTW, neither "AN/XYZ-99" nor "SCR-999" are to be considered as 
"packing lists." They are SYSTEM designations that identify a specific 
group of lower level components.

Always try Google when looking for info such as this; Google can be your 
friend - if you use it!

Ed Greeley

J. Forster wrote:
> William Donzelli wrote:
> 
> 
>>>It appears that the AN/XXX replaced the SCR sometime in the middle of WW II.
>>>Approximately when, and was it about the same time as JAN component numbering
>>>came out?
>>
>>1942 or so. There is an exact date of the TO.
> 
> 
> Does anyone know the number of the T.O. and/or have a copy or .pdf ? I'd like to
> scan it or Trackpads,
> 
> -John