[R-390] Mechanical Filters and "A" (was Hi)

Sun, 8 Jun 2003 22:54:35 -0500

Greetings,

All the R-1051 "Plain" designation radio's I have seen and had through the
shop have had the 500cps switch.    Unless there were maybe a few early
Prototype R-1051's that were retrofitted to what the production R-1051
"Plain"  turned out to be. (hard to imagine with the way the front panel is
cast)

There were no "A" models that I have been able to determine...seems they
went directly to "B"s.  Don't think I have ever seen an "E" or "F" model
either....jumped to "G"s and "H"s.....

Cecil Acuff
www.r1051.com

----- Original Message ----- 
From: "John Kolb" <[email protected]>
To: "Barry Hauser" <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Sunday, June 08, 2003 1:58 PM
Subject: Re: [R-390] Mechanical Filters and "A" (was Hi)

> On Sun, 8 Jun 2003, Barry Hauser wrote:
>
> > Hi Todd
> >
> > Well, there's a fly in that ointment.  For example, the R-1051 plain
(not to
> > be called "non-A" to prevent extreme confusion if the 'R-1051" part is
> > omitted) -- what was I saying? -- Oh yeah -- the R-1051 plain has
mechanical
> > filters and there was no known R-1051A.  The R-1051B and later also had
> > them.
> >
>
> As best I can recall now, when the R-1051 was first introduced, it
> only tuned in 1 kHz steps - then someone noticed that the Navy
> frequencies mostly ended in .5 for the actual carrier freq the
> radios would be tuned to, so there was a quick field change
> to add the .5 step switch. I think the R-1051A name was intended
> to be used for newly manufactured sets which included the .5 kHz
> step switch, but probably experience quickly found other necessary
> changes causing the creation of the 1051B with few or no 1051A's
> ever made. Anyone here old enough to prove or disprove this?
>
> As far as I know, I was the first one to successfully copy the
> fleet broadcast when it was introduced to westpac, using R-1051's
> and UCC-1's. Of course there weren't many ships with the equipment
> to compete with for the honor.
>
> John
>
>
>
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