F012 - EMC - Immunity of radio receiving and other devices and filtering techniques./ Social Issues
Quiz
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Which of these is unlikely to increase the immunity of a receiver to interferance?
The use of an internal mains filter
Fitting an attenuator in the antenna lead to the receiver
Wrapping some of the mains lead round a ferrite ring just before it enters the equipment
Wrapping some of the TV antenna lead round a ferrite ring just before it enters the equipment
Which is the safest action? Internal mains filters
Can be safely made and installed by a radio amateur
Can be safely made by a radio amateur
Should be commercially made and installed by an expert
Should not be fitted into equipment
The use of a separate RF earth in an amateur installation is primarily:
to improve the efficiency of the antenna
to improve the use of dipoles
to prevent RF currents spreading to other equipment along the mains
to filter interference from the mains earth to the RF earth
If you have tried your best to reduce interference to you neighbour's TV you should advise the neighbour to contact:
The local council
The local police
the RSGB
Ofcom
To reduce interference coming along the mains:
Thread several turns of wire onto a ferrite ring near the receiver
Form a 4 loop coil of the mains wireing and keep it in place using cable ties