I went searching just for fun...
Hey you know it's gotta be good when K9YC is dropping references to CIA
visits to his lair, when talking about baluns.
I think this is the report in question.
"FERRITE CABLE CHOKES. By Ernest T Harper, ARMY ELECTRONICS COMMAND FORT
MONMOUTH N J INST FOR EXPLORATORY RESEARCH"
http://books.google.com/books?id=P9BaNwAACAAJ
Apparently the report identified 3 cable chokes for getting >5k ohms
across the entire 2-30Mhz.
I can't find a copy of it online though, just the summary below. It
apparently was available publicly when it was published in 1966.
also here:
http://www.dtic.mil/srch/doc?collection=t3&id=AD0631053
<http://www.dtic.mil/srch/doc?collection=t3&id=AD0631053>
Title FERRITE CABLE CHOKES.
Authors Ernest T HARPER, ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
INST FOR EXPLORATORY RESEARCH.
Publisher Defense Technical Information Center, 1966
Length 47 pages
AD0631053
Book overview
A theoretical and experimental investigation was made of the factors
affecting the performance of toroidal inductors with ferrite cores and
windings of coaxial cable. Design procedures are developed and described
for toroidal cable chokes which provide a specified minimum amount of rf
isolation over a band of frequencies. It is shown how one may maximize
the width of the frequency band for a given rf isolation impedance. The
entire band, from 2 to 30 Mc, may be covered by a set of only three
individual cable chokes, providing an rf isolation of better than 5,000
ohms.
1966 - 47 pages
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