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Unread 21-01-2009, 00:56
BrentJ BrentJ is offline
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Re: positioning sensor

I would look at reversing the idea over who has the receiver.

I would make the person people have to stay away from wear the transmitter.
Then the other people would have a receiver that alarms when it picks up the transmitters signal.

On the receivers you would probably have to have an attenuator to cut down the transmitters signal to the range you want.

There are transmitters / receivers that work on the 433Mhz band used for telemetry. These normally don't have to have a licence and you can't transmitt continuously. But for what you want 1/2 - 1 second would work ok.

Just don't wear them in a hospital. In case they are using the frequency.
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