[R-390] Interesting receiver

[Francesco Ledda]

I think that it is an amazing reciever, considered that was designed in the
early sixties.



-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Cecil Acuff
Sent: Monday, October 23, 2006 1:02 PM
To: Transmaster; R-390
Subject: Re: [R-390] Interesting receiver


Originally built by General Dynamics.  Came in the R-1051 with no
designation, the B, C, D, E, F, G and H designations.  Some G and H models
I'm told are still in service in subs.  A very complicated receiver of
modular design but will stay dead on frequency once warmed up for
weeks..months etc....thanks to a 5 MC TCXO module.   Poor filter selections
but has a great feature for beating selective fading by using the double
sidband mode and it's two IF and audio chains zero beat on a SWBC station.
Really cool!

Not particularly sensitive and with low audio output.  Tuning method not
popular which I think has hurt it desirability.  When working properly a
pretty good receiver for SSB and SWBC.  Poor for CW.  When broke a real dog
to work on.

Will be a classic because of it's unique electro-mechanical design.

I'm surprised to see any listed with Fair Radio as I bought all the
remaining complete radio's they had probably 5 years ago.  Maybe they got
some more.  Last time I checked the military was crushing all of them coming
out of service and selling for scrap.

I gave away the last 6 or 7 I had to get them out of the shop...tired of
tripping over them.  They were complete but non-functional...

Cecil Acuff


----- Original Message -----
From: "Transmaster" <22hornet at gmail.com>
To: "R-390" <R-390 at mailman.qth.net>
Sent: Monday, October 23, 2006 12:05 PM
Subject: [R-390] Interesting receiver


>I was looking through Fair Radio Sales website and I spotted this receiver
> R-1051B does anyone know who built this unit and when they where in use.
> Receivers have always fascinated me to see what engineers come up with
> to do the  essentially the same job over the years.
>
> Ken
>
>
> --
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