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

[Robert Downs]

One other minor comment - the tube cap more likely goes to one of the grids than to one of the plates.


Robert Downs


-----Original Message-----
From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Michael Hanz
Sent: Saturday, October 6, 2018 17:34
To: Al Klase
Cc: BoatanchorsQTH.net; 'Military Radio Collectors Association'; milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] [Boatanchors] Need Navy "DU" Loop Antenna Docs

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.