[ARC5] Nomenclature Taxonomy

[WA5CAB at cs.com]

Actually, those aren't inconsistencies (paragraph 7 below) as I understand 
the system.  As best I can tell (I have never come across the rules 
document), the rule in the AN system was basically about backward and forward  
compatibility.  In the case of the T-47A, it had no significant capability that 
the T-47 didn't (in fact, it has less, as it does not cover 600-1500 KC).  As 
with the AN/GRC-9, the "A" in AN/ART-13A indicates other differences 
between the two sets. 

In the case of T-412/ART-13B, however, there was a significant difference 
in capability (the crystal oscillator).  So not only the component 
nomenclature but also the set nomenclature was changed or incremented.

Plus I have to add that a T-47A with an installed CDA-T is not a DOD or 
USAF modified unit.  USAF modified units got a T-412 nameplate.   Those units 
without the T-412 nameplate were done by a contractor for Pan American or 
done by some other non-DOD activity (including hams with the mod kit).  Same 
applies to T-47's and COL-52286's with CDA-T installed.

In a message dated 6/23/2011 2:55:49 PM Central Daylight Time, 
kk5f at earthlink.net writes: 
> Robert wrote:
> 
> >Error.  I have some steel LG-2-A that are stamped LG-2A..  Probably the 
> >last ones made before the aluminum LG-2-B came out.
> 
> I agree with Robert.  There is tangible value to use of the correct format
> or taxonomy for the system applicable to the particular equipment.
> 
> In the old Army nomenclature system of Robert's example, that means that 
> LG2A,
> LG2-A, and LG-2A are incorrect component IDs for the LG-2-A.  For system 
> IDs
> like SCR-274-N as well, SCR274N or SCR-274N are incorrect.
> 
> In the old Navy nomenclature system, it's RAL-3, ZB-2, and TCS-12, not 
> RAL3,
> ZB2, or TCS12.  It's CBY-46105 for that RAV and ARA compnent, not 
> CBY46105.
> 
> The JAN system has room for many errors.  For the R-23A/ARC-5, the use of
> R23A/ARC5, R 23A/ARC 5, R-23-A/ARC-5, or ARC-5/R-23A are ALL a few 
> examples
> of incorrect usage.
> 
> Even manufacturers make careless mistakes.  Hughes used RT-794-B/PRC-74
> on the name plate of the RT-794B/PRC-74.  Oklahoma Aerotronics misspelled
> RECEIVER as RECIEVER on the R-1004A/GRC-109 name plate.  There are others.
> 
> Then, there are subtle inconsistencies in the JAN system.  The 
> R-1004A/GRC-109
> is part of the AN/GRC-109A, the RT-794B/PRC-74 is part of the AN/PRC-74B, 
> and
> the T-47A/ART-13 is part of the AN/ART-13A.  However, AN/ART-13B applies 
> to
> both the system using the T-47A/ART-13 with CDA-T LF/MF/HF crystal 
> oscillator
> AND the system using the T-412/ART-13B.  The RT-77A/GRC-9 is not 
> necessarily
> part of the AN/GRC-9A.  The AN/GRC-9A means only that a DY-88/GRC-9 power 
> unit
> is being used in a system which can have either a RT-77 or RT-77A/GRC-9 as 
> the
> main unit.
> 
> There's those Collins commercial model numbers too, some used without 
> change
> by the military.  The USAF 618S-1 is correct, not 618-S1 or 618S1.
> 
> We could get into aircraft nomenclature, like the one the Navy used before 
> the
> services standardized in 1962.  PB4Y-2 is correct, not PB-4Y2 or PB4-Y2 or
> PB4Y2.  For the USAAF and the current common system, B-29A is correct, not 
> B29A
> or B-29-A.
> 
> And then there's firearms.  Who wants to address M-1911A-1 vs. M1911A-1 
> vs.
> M1911A1?
> 
> And foreign nomenclature!  Wireless Set Number 19 Mark II, or Wireless Set
> No. 19 Mk. 2, or W.S. 19 Mk II, or WS19MkII, or many many other variations
> for the exact same set.  This one of many UK examples is horrific simply
> for how difficult it is to determine THE actual *correct* nomenclature,
> especially for a complete and unambiguous database search.
> 
> It would make internet equipment searches much easier and productive had 
> all
> the databases and websites simply used the defined taxonomy that applies 
> to
> the equipment of interest.  To deliberately do otherwise is an impediment.
> 
> Mike / KK5F
> 

Robert & Susan Downs - Houston
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