[Milsurplus] R-1051G

[Barry Hauser]

Hi Breck

Something seems a bit amiss with what you wrote vs. that web page, etc.

The top photo shows what is typical of the R-1051 (plain-no letter), 
R-1051B, through, possibly D.  Don't recall if there was an E.   All those 
models had what is called the "six-pack" design.  There were at least two 
versions of the six-pack typec  - the original R-1051(plain) vs. the 1051B 
and later.  The main difference -- resolution.  The first model went down to 
500 hz steps by means of the switch on the vernier.  Starting with the B, it 
went to 100 hz and those models of 1051's have the larger knob with the 
appropriate stepping.  Nominally, the six packs from the "plains" are not 
interchangeable, though I've heard that it will work after a fashion - but 
the vernier and additional stepping won't work if crossed.

The "flat-top" design started, I believe, with the F.  If not, definitely 
with the G and H, and I believe those are the same in that regard.

What that web page seems to show -- Top is of a plain or B with the original 
six-pack design.  The line drawing shows a top view of a "G" (or H) with the 
top cover in place.  The last image is a photo of a G or H with the top 
cover removed exposing the plugin cards and the cover is in the background. 
I don't see where it shows the difference between a G and an H anywhere on 
that page -- is it elsewhere on the web site?

All that said, I have a B that showed up with the flat-top version and 
works.  Most all the modules (with exception of the plain's six pack) are 
generally swappable -- upward and downward compatible -- across the 1051 
alphabet soup.  However, I'm told that, for peak performance, the R-1051's 
should be aligned as a total assembly, using a variety of extender cards.

If you have trouble finding that card, you could try an older type six pack, 
if available, but don't use a 500 hz (1051-plain) version.  Actually, after 
the B, there were some feature/front panel changes, and evolution of the 
components used, but no substantial change in performance or specs.  The 
earlier models, in retrospect, now have the advantage of using mostly all 
discrete components.  The later ones introduced IC's that are more difficult 
to find now.

These receivers are prone to some "dumb" problems which you should not 
overlook before seeking parts.  They use hybrid D-Sub connectors in the 
bases of the modules and mainframe which incorporate tiny RF coax 
connectors.  Those or sometimes even the d-sub terminals, can sink or fall 
into the mainframe socket causing disconnects.  Put the receiver on its side 
with the chassis pulled open and check the bottom of the chassis for any 
signs of this.  If you find any, you can often just individually push them 
in to make contact.  Also, the mainframe needs to be mechanically synch-ed 
with some of the modules and there are index markers on the drive disks for 
that purpose -- procedure is in the manual.  Not sure if that affects 
synth/translator functioning.

Cecil Acuff would be someone to contact for parts/support if he still has 
anything.  At one point he had set up to restore and service the R-1051's.

hope this helps
Barry





----- Original Message ----- 
From: "B. smith" <smithab11 at comcast.net>
To: "milsurplus" <milsurplus at mailman.qth.net>; "boatanchors List" 
<boatanchors at theporch.com>
Sent: Sunday, November 13, 2005 9:45 AM
Subject: [Milsurplus] R-1051G


>    A  70 pound, over designed, triple conversion , heavy, bulky, hard to 
> tune, save us from the Ruskies, NMBA (Navy Modern Boat Anchor), a R-1051G 
> model wound up on my digital bench this week.
>    I am looking for plug in cards for the RF Translator/Synthesizer 
> section A2A6 and may need a Frequency Standard Module A2A5  as I do not 
> have the extender cards for direct single
> point component  trouble shooting.
>    The "G" model is some what different from the earlier models as it has 
> a separate housing for the synthesizer sections and the translator (why 
> couldn't they just call the translator a  a mixer stage anyway? why do we 
> have to rename everything??)
>
> I am either looking for a complete Parts or perhaps a complete receiver. 
> Pictures of the basic layout
> differences between the G and H models  and the earlier models can be seen 
> at:
>
> http://solo11.abac.com/zorroab1/R-1051G/Page1.html
>
> Thanks
>
>
> breck k4che
> Dover, Delaware
> Annt nutten in Dover except
> Chickens, a NASCAR track,
> and hams that can't solder.
>
>
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