[R-390] "A" Versions of Military Receivers with/without Mechanical Filter...

[ToddRoberts2001@aol.com]

In a message dated 6/8/2003 3:08:48 PM Eastern Daylight Time, 
bratcher@pdq.net writes:

> At 11:36 AM 6/8/2003 -0700, you wrote:
> >>Can you give me an example of a U.S. military radio
> >>receiver
> >>with the "A" suffix that does not have mechanical filters? Yours
> >>Truly, Todd
> >>Roberts WD4NGG.
> >How about the TMC R-5007A/FRR-49(V). No mechanical filters.
> >How about the Hallicrafters R-649A/URR. No mechanical Filters.
> >Hoq about the R-274A. No mechanical filters.
> >
> >Need I say more?
> >
> >RICH  WA6KNW
> 
> R274A? Never heard of it. The R274 I've got is the mil version of the 
> Hallicrafters SX-73 with no A on the label. Which reciever is the R274A?
> 
> What is the Hallicrafters R649? Never saw one....

Interesting examples BUT doesn't R-274 denote a "family" of receivers and not 
one particular model? The R-274 series could be either a Hammarlund SP-600 
variant or a Hallicrafters SX-73 variant - two mechanically and physically 
different radios? There was an R-274 series, R-274A series, R-274B series, R-274C 
series.  There was indeed an R649 receiver made by Hallicrafters. Built for the 
Treasury Dept. and used as Coast Guard monitors. Never seen or heard of an 
R649A. They are so obscure that Chuck Dachis is looking for one on his web page. 
Never seen a listing for an R-5007A receiver. I have seen a mention of an 
R-5007/FRR-502 series - must be really obscure. 73 Todd Roberts WD4NGG.


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