[R-390] Differences between the various URM-25 generators?

[Mark Huss]

We taught that unlike most military equipment, AN/URM-25x stands for
AN=Army-Navy
U=General Utility
R= Radio
M = Maintenance and Test Assembly
25 = non-specific RF Generator
x = which brand generator.
Which is about all that makes sense.
All joking aside, the URM-25 is from a short period where someone in 
Procurement decided to make nomenclature a function of specification 
rather than a specific design. You used to see a few items running 
around like that. But the URM-25 took it to a whole new level. Most of 
the models are completely different both electricly and mechanically. 
You would think you were looking at completely different generators, 
rather than minor changes in the design. If the same criteria existed 
today, the M-1 Tank would be known as the M-48C.

P.S. I have a sweet mint AN/BBB-3A for sale (Army-Navy Underwater Pigeon 
Bomber #3A [the A stands for substituting a Duck for the Pigeon])

Tom Norris wrote:
> I've seen the "F" model with the flat panel, and I have a Trad SG-25 
> with a brushed metal front but otherwise appears to be identical to 
> the "B". The one manual I downloaded from LOGSA ages ago "says" it's 
> for the URM-25B, but the unit in the manual bears little resemblance 
> other than general circuit description. What other variations were there?
>
> 73
>
> Tom NU4G
>
>
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