[Milsurplus] Designations

[Nick England]

Ok, there is no such thing as a US Military “R-390A”. There may have been a
commercial designation, maybe the EAC units offered for general sale? I
don’t know about non-military.
But “R-390A” is not a valid military nomenclature.  Yes it is commonly used
and everyone knows what you mean by it but only
R-390A/URR is official.

FWIW, NSA has their own nomenclature system.

On Fri, Jun 7, 2019 at 8:19 PM KD7JYK DM09 <kd7jyk at earthlink.net> wrote:

> "Actually there is no such thing as an R-390A. There is only an
> R-390A/URR."
>
> I had some of each.  Some made by Collins, some by Motorola, with
> documentation that matched the nomenclature.  Additionally, the radios
> had slightly different controls, and those without the dataplates could
> be determined at a glance, just by what knobs were on them, and what
> those knobs controlled.  For example, some had a certain number of
> positions, and functions, and the "same knob" on another, had a
> different number of functions, and positions.  Unless one of the
> companies dropped the /URR off the dataplates, and paperwork, there was
> at least the A, and A/URR.  I don't know of any further designations, as
> I only owned those models.  I no longer have the radios, I sold them in
> the mid-90's to buy a car, however, I still have a manual for one, and
> with a little luck, it's for the "no such thing" model.  Will let the
> group know, when I find it.
>
> Kurt
>
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-- 
Nick England K4NYW
www.navy-radio.com
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