Semiconductors (active electronics) are subject to RF interference of high enough amplitude. The normal P-N or N-P junctions in bipolar junctions rectify the RF energy and provide voltage offsets that are particularly annoying to analog signals. Most of what I've seen are discussions about interfaces to the circuits; in the case of the Area451, I would imagine most of the energy would be on the wires.
A clamp-on choke that attenuates at the right frequencies without affecting the risetime of the signals would help keep that energy out. Too aggressive and the intentional signals are attenuated in bad ways.
The bulk-cable clamp-on chokes may work okay since the ground also goes through the same cable bundle, cutting out the common-mode "noise" while keeping the differential clean. If the bulk-ferrite approach doesn't work so well, some guidance as far as which individual lines to filter and what ferrites to try could be helpful from those who know the signals.
If the twisted pair was one of the items of interest, a ferrite around just those two signals might also help.
John, I hear MIT calling you - there's a critical demand for your wizardry.
Last edited by CruzinSusan; 05-09-2009 at 10:01 PM.
Looking at you is like looking at my Dad 50 years ago. He was a brainiac too. Somebody needs to pay you to think.
That world of *physioelectronomicalisity* - it was there, in the garage, filling each nanospace with brilliance. That stratosphere up there where we mortals only imagine...and where the big problems get solved.
Bipolar ferrets may be on the Endangered Species list. I'd be careful about advocating the asphyxiation of said animals, especially on a public forum. They even have their own animal rights advocacy group: BFFs (Bipolar Ferrets Forever).
Bipolar is a common mode for active ferrets that should be rectified to offset their behavior. If you see a twisted pair, choke them when they're wired.
Bipolar ferrets may be on the Endangered Species list. I'd be careful about advocating the asphyxiation of said animals, especially on a public forum. They even have their own animal rights advocacy group: BFFs (Bipolar Ferrets Forever).
Quote:
Originally Posted by John_H
Bipolar is a common mode for active ferrets that should be rectified to offset their behavior. If you see a twisted pair, choke them when they're wired.
I have the same problem. I installed an HF/UHF/VHF unit in my Smart. I have the cruise control from Smart Madness. Have you figured out what needs to be shielded? Also, if the cruise control is removed, does the problem still exist? This is really troubling since I have used radios in practically every car I have owned and never had a problem (and I've owned many cars).
By the way, the problem happens on HF (14.3 MHz) also.
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