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Author Topic: Radio Proximity Cat Collar alarm.  (Read 540 times)
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myheadhurts
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« on: June 12, 2015, 09:11:50 21:11 »

Radio Proximity Cat Collar alarm.

Hi there folks..

My brother has a chicken coup ,that is forever being worried by his cats . (He loves cats so they stay Smiley ).

He'd like to know if its possible to mount a low power radio transmitter that will activate a collar mounted buzzer when the cat collar gets within a 20ft radius the coup.

I took a couple of transmitter / receivers I use in the 433Mhz and 856Mhz range and one of the cheap 315Mhz pairs on half voltage , and all have a far to big a radius in free air.

I also thought about using a bluetooth or zigbee type chipset that could give me a carrier signal strength detection value/threshold ,but haven't found one so far..

To Sum up .. Looking for very low power transmitter and a receiver small enough to fit a cats collar.

Any Ideas ..

TIA Rob.
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towlerg
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« Reply #1 on: June 12, 2015, 10:51:31 22:51 »

Shouldn't be that hard to reduce range, you need to detune (is that the correct word), try making it shorter or longer or even attenuate it.

George
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« Reply #2 on: June 13, 2015, 07:10:29 07:10 »

For a domesticated-cat collar, you want to use a loop antenna:




Seriously, mess up the antenna (clip it for instance, or mess up the matching network)
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