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The Medway Handyman

wrote:
Andrew Gabriel wrote:
In article
,
jim writes:

inductive loops eh... could you describe how they work please? - are

A sort of up-side down metal detector, i.e. the metal detector
is buried in the ground and detects metal passing overhead.
Google is you want to know more.

they DIY-able?

Yes, but possibly not legally. I don't know what the radio licence
requirements are, but whatever, you're unlikely to have the tools
necessary to prove they meet the radio licence requirements (as
they are radio transmitters).

IIRC below a certain level of emission you dont need any license or
approval. Cant remember what power that is though, but its a small
fraction of a watt, and doesnt trasmit far.

In the context of the OP's question e.g. a garage bell, perhaps the signal
could be transmitted with a wire?

--
Dave - The Medway Handyman
www.medwayhandyman.co.uk