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Chelmsford Amateur Radio Society M3 Foundation Course EMC

Chelmsford Amateur Radio Society M3 Foundation Course EMC. EMC - Introduction. EMC - E lectro- M agnetic C ompatibility Consumer Appliances and Radios together in Perfect Harmony! EMC has two aspects:- Avoidance of generating interference. Immunity of own kit from being interfered with.

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Chelmsford Amateur Radio Society M3 Foundation Course EMC

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  1. Chelmsford Amateur Radio Society M3 Foundation CourseEMC

  2. EMC - Introduction • EMC - Electro-Magnetic Compatibility • Consumer Appliances and Radios together in Perfect Harmony! • EMC has two aspects:- • Avoidance of generating interference. • Immunity of own kit from being interfered with. • EMC has the potential for causing Neighbour Disputes • Commonly Television Interference - TVI • Sometimes on HiFi, Telephone Lines • Even a few Watts is enough to overpower a TV preamp • Radio Investigation Service (RIS) handles complaints

  3. EMC Precautions • Suppress problems at their source ! • Modes/Power - SSB causes more problems than FM • Antenna Position - Space away from TV Antennas, Phone Lines • Use Lowpass/Band Pass Filters to suppress Harmonics for TVI • Use Dedicated RF Earths - not Safety Mains Earths • RF Traps/Ferrite rings on antenna feeders - helps the Source • Inline Filters, Ferrite Rings may be needed - helps the Victims

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