[R-390] Interesting receiver

[Transmaster]

It is to bad there isn't the kind of documentation  for these less
know rrigs such as one finds for Collins equipment.  By this I mean
the notes and thoughts of the engineers who designed various part of
a Collins radio.  I find it fascinating to learn the why, the how, and
the reason why  these milispec radios where built as they where.

                                          Ken de W7ITC.

On 10/23/06, Cecil Acuff <chacuff at cableone.net> wrote:
> 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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> >
> >
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>
>
>


-- 
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.