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1. 01:33 PM - Radiated or conducted (MPPalmer@aol.com)
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| Subject: | Radiated or conducted |
I've written about this before, so I'm going to keep this brief. (Search the
archives for "radiated" and "conducted."
There are two ways EMI can get into your radios. Either by the power cord
(conducted) or by antenna. (radiated.) I don't know about this PC you're using.
If it's battery powered and you get interference, then your problem is
radiated. It could be the CPU or the screen drivers. In any event, metal shielding
is
the usual solution. If you put your gizmo in an enclosed metal box (for
testing) and the radio noise goes away, it's radiated.
If your PC is powered by the aircraft bus and the noise goes way when powered
independently, by a separate battery, then the solution is beads, capacitors,
etc. on the power lines. Usually it's easier to squelch conducted than
radiated RFI.
Of course, it could be a mixture of both kinds of interference.
Mike Palmer <><
(obsolete MSEE)<BR><BR><BR>**************<BR>Vote for your city's best dining and
nightlife.
City's Best 2008.<BR> (http://citysbest.aol.com?ncid=aolacg00050000000102)
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