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RADIO EQUIPMENT.  INTERFERENCE POTENTIAL GOES BOTH WAYS  DIGITAL SIGNALS
ARE RICH IN HARMONIC CONTENT, AND OFTEN GENERATE PERIODIC BIRDIES AND HASH
WELL INTO THE VHF SPECTRUM.  THESE SIGNALS INTERFERE WITH OUR ABILITY TO
HEAR, PARTICULARLY WHEN USING SSB, ALTHOUGH FM RECEPTION CAN BE AFFECTED
TOO.  PERHAPS MORE IMPORTANTLY, MOBILE TRANSMISSIONS CAN INTERFERE WITH THE
VARIOUS SENSORS FEEDING DATA TO THEIR RESPECTIVE CPUS.  THIS IS
PARTICULARLY THE CASE WHEN EXCESSIVE COMMON MODE CURRENT FLOWS ON OUR FEED
LINES COAX.  WE SHOULD NOTE THAT THE CPUS THEMSELVES ARE DESIGNED AND
RIGOROUSLY TESTED TO REJECT RFI WELL INTO THE GHZ SPECTRUM.  ALTHOUGH
EXEMPT FROM FCC PART 15 RULES, AUTOMOBILE MANUFACTURERS DO THEIR BEST TO
LIVE UP TO THE PART 15 REQUIREMENTS.  IT IS ONE OF THE REASONS WHY
PASSIVATED GLASS IS USED IN MODERN PASSENGER VEHICLES.  ENGINE IDLE SHUTOFF
ONE OF THE LATEST AUTOMOTIVE INNOVATIONS IS EIS ENGINE IDLE SHUTOFF.  IN
SHORT, YOU PULL UP TO A RED TRAFFIC LIGHT, AND THE ENGINE SHUTS OFF.  WHEN
THE TRAFFIC LIGHT TURNS GREEN, YOU LET OFF THE BRAKE, THE ENGINE RESTARTS,
AND AWAY YOU GO.  BEHIND THE SCENES ARE REQUISITE HARDWARE CHANGES THAT
‰  END OF 30 WPM TEXT  ‰  QST DE W1AW  ƒ