[Milsurplus] DU-1 DF Loop

[Mike Hanz]

jay.coward at avagotech.com wrote:

> I have two more DU's slated for future RU/GF and RU/RU projects. Do I do the same mod to these two DU's for the sake of convenience or do I (we) convince Mike to do a "limited production run" of these quite unique connectors?
>

That might be arranged, if I can ever get moved to the new QTH and 
reassemble the Hardinge (it is already down there with the entire left 
end off - to replace the spindle bearings after we get down there 
permanently.)  In the meantime most people just us a banana plug.  :-)   
I wouldn't drill any new holes, personally - there are a whole lotta 
ways to adapt it.

>Also, in regard to the GO-9, I have received some documentation describing modifications to enable the GO-9 to provide "RCM" capability. The descriptions and instructions do not elaborate on what "RCM" in Navy terms means. I believe it to be a "jamming" role. More details welcome.
>

RCM = ECM.  In the classified world of ELINT that sprang up at the 
beginning of the war, RCM was originally intended to stand for Radio 
Counter Measures, and didn't differentiate between frequency ranges.  
The focus on RADAR signals collection and countermeasures often morphed 
it into Radar Counter Measures, but that wasn't the official title.  The 
mission given to Division 15 (RCM) by the NDRC was Radio - in part 
because it obfuscated the nature of the work for security reasons. 

There was a whole series of these mod kits designed for 100w aircraft 
transmitters of the time, including the BC-375 and ART-13, and of course 
the GO-9, all intended to jam ground communications receivers.

Best 73,
Mike