[Milsurplus] Designations

[Todd, KA1KAQ]

I think Kurt may have been referring to the R-390 and later, cost-reduced A
model. There are indeed electrical and physical (ooof) differences.

You are correct that the /URR suffix is the official designator beyond the
Hammarlund/EAC civilian versions sold in the late 60s/early 70s. One thing
that never existed is the "R-390 non-A". That designation is a product of
misinformation over recent decades.

Another FWIW - as of a few years ago, the NSA still had at least one SP-600
tucked away in their vaults with some swapped out Dakaware knobs.....

On Fri, Jun 7, 2019 at 8:57 PM Nick England <navy.radio at gmail.com> wrote:

> 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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