[Milsurplus] [Boatanchors] Need Navy "DU" Loop Antenna Docs

[Michael Hanz]

Hi Al,

Try 
http://aafradio.org/docs/1936_NRL_Aircraft_Radio_Training_Manual_DF_Chapter.pdf 


About halfway down (page 122 through 125), there is a discussion about 
the RDF-1-A, which seems to essentially be the early DU.  The vacuum 
tube is a Navy 38233 (RK-33), which became a type 1642.  I have an extra 
if you need one.  I acquired an L-1130-A DF unit from the RDF-1-A system 
that appears identical to the DU, but had to make a new tube cover for 
it on the lathe because it was MIA.  Photo attached.

           73,
  - Mike  KC4TOS

On 10/6/2018 5:43 PM, Al Klase wrote:
> Subject says it all.  I have the DU-1 manual, but there are some 
> important differences.  The big one, what vacuum tube is used?  DU-1 
> used 2 12SK7's but this uses a single 7 big-pin with plate cap.
> Any help appreciated. 

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