Chelmsford amateur radio society m3 foundation course emc
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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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Chelmsford Amateur Radio Society M3 Foundation CourseEMC


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


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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