[Milsurplus] Navigation System

[WA5CAB at cs.com]

Scott,

No, that isn't quite correct.  Both SCR- and later AN/ system nomenclatures 
were usually assigned when the need was identified, or more correctly when the 
Military Characteristics were set.  In many if not most cases, the component 
nomenclature wasn't assigned until the equipment was built.  So the component, 
not the system nomenclature is the better indication of chronology.

But before someone jumps up and starts throwing out either SCR or BC numbers 
to refute that, remember that a lot of the numbers were blocked off in advance 
for specific functions.  Like the TM 11 numbers were.  So for example 
SCR-508/509/510 and 608/609/610 were all assigned at the same time.  

In a message dated 3/20/2006 2:48:17 PM Central Standard Time, 
scottjohnson1 at cox.net writes: 
> It's not odd when you consider the number of the receiver, versus the 
> number of the complete set. that is what indicates the chronology of registry in 
> the JAN system.
> 
> Scott
> >
> >From: Mike Hanz <AAF-Radio-1 at cox.net>
> >Date: 2006/03/20 Mon PM 12:15:46 PST
> >To: milsurplus at mailman.qth.net
> >Subject: Re: [Milsurplus] Navigation System
> >
> >>
> >>
> >>For WWII-era, you'd have to omit the AN/ARN-6, which is definitely a 
> post-WWII set.  Oddly enough, the improved SCR-269 (BC-433) ADF, the AN/ARN-7, 
> well predates the AN/ARN-6.  
> >>
> >
> >Well, I was somewhat less certain about that when I read the 
> >observation.  In the process of moving, I unearthed CO-NAVAER 08-5Q-227 
> >(Nomenclature List for Bureau of Aeronautics Aircraft Electronic 
> >Equipment - Confidential) dated 1 April 1945, and the ARN-6 is listed 
> >there plane (heh) as day.  Equipment that hasn't been released for 
> >deployment yet has "In development" next to the entry, but no such 
> >remark accompanies this entry, which simply sez, "AN/ARN-6( ).   
> >Airborne MF Automatic Radio Compass.  Lighter in weight than SCR-269."  
> >I'll agree it was probably not widely deployed by then, but 
> >/technically/ it seems to qualify as a WWII set - depending on one's 
> >definition of 'wartime', I suppose.  Of the ARN-7, the entry says, 
> >"Airborne MF Automatic Radio Compass.  Similar to SCR-269( ) except 
> >added frequency range."  It also lists ARN-8 and ARN-12 marker beacon 
> >receivers.  No indication of ARN-9 to 11, but that's typical for the 
> >Navy pubs...if it's a Signal Corps-instigated acquisition, they ain't 
> >interested in them.  :-)

Robert & Susan Downs - Houston
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