Ken:
I don't see any reference in 461 to the height of the ferrite above the
enclosure floor. Are you free to put the ferrite anywhere between zero and 120
cm above the floor, or is there some "sweet spot" height that is preferred? If
so, then why?
Ed Price
[email protected] <blocked::mailto:[email protected]> WB6WSN
NARTE Certified EMC Engineer
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780
Military & Avionics EMC Is Our Specialty
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of Ken
Javor
Sent: Wednesday, July 29, 2009 7:21 AM
To: Untitled
Subject: Re: Mil-Std-461F 41" rod Ferrite & Cable query?
“In addition, Figure RE102-6 is revised to show the antenna lowered so
that
the center point of the
41” rod element is 120 cm above the test chamber floor. Further, this
figure shows that the
coaxial cable emanating from the rod antenna base is carried directly
to the
floor and grounded
there, with a ferrite bead installed between the rod base and the floor
ground point. The ferrite
bead should have between 20 – 30 Ohms impedance at 20 MHz. A bead that
works in this
application is the Ferrishield B1642.”
From an article in Conformity magazine that describe the –461F changes,
January 2008.
Ken Javor
Phone: (256) 650-5261
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