[Lowfer] 1942 Bendix DU-1 RDF Loop vs e-probe test

[Michael Sapp]

Hi All: I seem to have tamed the noise gremlins on the power supply I built up for a 1942 era Bendix DU-1 RDF Loop.

I was able to get about 2.9mH per winding on opposing phase common mode chokes wound on FT75-82 cores --- about 

9,000 ohms of choking reactance per coil winding at 500kHz.  Considering the loop is in my basement below ground it seems

to play reasonably well a with  quiet power supply...a mag shield to cover the PS transformers is the next improvement. I can rotate

the orientation of the power supply to minimize mag field interaction with the loop....

http://s1296.photobucket.com/user/wa3tts/media/IMG_3990_zps4d0a0934.jpg.html

Power supply picture links to photobucket show detail in the video description. 

73 Mike wa3tts