[R-1051] R-1051 variant summary

[Jan Skirrow]

Hi Nick

This is a very useful website Nick - I wish I'd had it when I first 
ventured into repairing these beasts! You have one "?" in your variant 
list: for info, my R1051D has metal chains. I've never seen another "in 
the flesh" so I don't know if this was always the case. My "D" also has 
a very nice feature: there is no hard stop at 0 on the tuning knobs that 
control the mechanical linkages. I don't think this is a mechanical 
fault, and it sure makes the radio easier to tune to be able to go from 
0 directly to 9 without cranking it all the way back. My "no suffixes" 
all have the hard stop.

You might add at least a picture of the FS Converter CV483/URA-17 often 
used with the 1051s (or so I'm told). I had a bunch of these (most in 
sad shape) but got almost all working and found homes for them over the 
past few years - I kept a pair that were in excellent condition. They 
are bolted together in a frame (I recall it has a mil designation on it, 
but I can't get at it easily just now to look at!). This pair has 
different knobs than the receivers. I assume these were added during a 
rebuild, as I bought them directly from DRMO. A few of the others I had 
also had the variant knobs. I have one of the MT-3114A/UR shock mounts 
(NIB) you show, but have often wondered how the FS Converter was mounted 
in a ship installation as the frame doesn't seem to have provision for 
shock mounting, and no way to attach to the radios when they are in the 
MT-3114A/UR.

There seems to be a pair of converters in the KH6BB operating position 
in your pix. These don't have the mounting frame I have, but some kind 
of standard rack brackets similar to some I have for mounting the radios 
in a rack (which look to be identical to the ones in one of your pix of 
the R1051Gs in their rack). The frame on mine would prevent them being 
rack mounted, so I assume there was some other configuration to give 
shock protection. The converters I had had a couple of different 
circuits for the output - the older (original) was probably to drive a 
teletype directly. The newer was possibly to interface with something 
else entirely, possibly a solid state device, or a more modern teletype.

I've never seen the inside of an R-1051G until your pix, but sure looks 
like the only major change was the replacement of the %$#@ six pack with 
a version having removable cards. I understand that this synthesizer 
design used ICs instead of discrete semiconductors but the rotary tuning 
cage design retained the two tubes.

I've kind of struggled with these radios for some years now, and picked 
up bits and pieces of info from a lot of different people. Any 
corrections would be greatly appreciated! I have a few bits and pieces 
salvaged from the couple of converters I junked for parts - if anyone 
needs anything I'll see what I have.

73, Jan - VE7DJX



Nick England wrote:
> I've added a page to my Navy Radio web site with R-1051 variants listed.
> http://www.virhistory.com/navy/rcvrs/r1051.htm
> I'd appreciate any corrections, additions, clarifications, etc.
> cheers,
> Nick K4NYW
> www.virhistory.com/navy 
>
>
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