[R-390] Interesting receiver

[Cecil Acuff]

I agree it's an engineering marvel...one that replaced an engineering marvel 
the R-390 series.  But in terms of performance, outside of frequency 
stability and SSB demodulation, it's pure receive performance is bettered by 
a good R-390A...probably even a good SP-600.  The R-1051 suffered from a lot 
of internal noise...it's full of germanium transistors.  I heard in the 
later years it was costing the military around 30K each for the G and H 
models.  That was probably in the 80's if I were to venture a guess.

Cecil....


----- Original Message ----- 
From: "Francesco Ledda" <frledda at verizon.net>
To: "Cecil Acuff" <chacuff at cableone.net>; "Transmaster" 
<22hornet at gmail.com>; "R-390" <R-390 at mailman.qth.net>
Sent: Monday, October 23, 2006 1:09 PM
Subject: RE: [R-390] Interesting receiver


>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
>>
>>
>> --
>> Kenneth A. Crips, W7ITC Home of the Chew Crew,  Red Headed
>> Irish Terrier House Ninjas, Beezie, Chic', and Cowboy
>> 10th degree black belts in Mouch Fue, Bed Fue, and
>> Con Artist Fue.
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