[Milsurplus] Re: RU/GF documentation

[WA5CAB at cs.com]

I haven't carefully check the earliest models but would be surprised if they 
aren't the same way.  All of the (later anyway) GF transmitters and RU 
receivers are wired for 14 volt heaters.  The only difference between the 14 and 28 
volt units of each pair is the nameplate.

A quick ID method for an RU receiver that doesn't have a nameplate is to look 
at pin 77 in the connector.  The RU's that came with GF's have a wire going 
to the cathode of the 77 AGC tube.  The standalone RU's have no connection to 
pin 77.

FWIW, if anyone should need them someday, I have reprints available of the 
NAVAER manuals on the GF-11/RU-16, GF-12/RU-17 and RU-18/RU-19.  I also have the 
RU-5, RU-11/RU-12, GF-3/RU-4a and GF-10/RU-15 manuals but not yet scanned and 
cleaned for reprinting.

I also have, courtesy of a list member, the installation instructions if 
anyone has a 75 MM Gun Motor Carriage (Halftrack) they want to put a Marine Corps 
radio in.  :-)

In a message dated 3/20/2008 3:37:24 PM Central Standard Time, 
kk5f at earthlink.net writes: 
> >After REALLY looking at the labels, the set is not RU-16/GF-11 but RU-19 
> and
> >GF-12. Does that make any difference?
> 
> Hi Meir,
> 
> As Robert mentioned, there are differences between the RU-17 normally used 
> with the GF-12 and the RU-19 that you have.  I thought I'd throw in some 
> specific details.
> 
> RU-16/GF-11 (12 vdc) components are identical to RU-17/GF-12 (24 vdc) c
> omponents except for the junction box, antenna relay, and dynamotor units.  The 
> RU-17 junction box CW-62018 contains A+ voltage dropping resistors for filament 
> power going to the 12 vdc receiver CW-46051A and transmitter CW-52063A, the 
> antenna relay CW-29076 contains a 24 vdc relay, and the dynamotor CW-21454A 
> is designed for 24 vdc input.
> 
> NB:  Your "24 vdc" blue-tag GF-12 is actually wired for 12 vdc filament 
> power.
> 

Robert & Susan Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at comcast.net> (Backup email)
   
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