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Them sonar things are a load of crap! My neighbour bought one and had it up for 3 days before taking it back. I could bloody hear it at night and it was doing my head in. If humans can't here it why do some have PIR sensors turning it on and off ? Surely you can just leave it on...?... No cos they are crap and humans CAN hear it.

Don't get me wrong I'm not for all types of hunting.

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Originally Posted by Wheels
Them sonar things are a load of crap! My neighbour bought one and had it up for 3 days before taking it back. I could bloody hear it at night and it was doing my head in. If humans can't here it why do some have PIR sensors turning it on and off ? Surely you can just leave it on...?... No cos they are crap and humans CAN hear it.


The correct frequencies are way outside the human range, but a faulty circuit design or a bit of cr@p in the transducer and you will get sub-harmonics which are audible.

The PIR concept is generally for battery models, the PIR can be very low current, the transducer though takes power.


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Last edited by Mark; 8th Jun 2011 7:23pm. Reason: comments removed
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I had one of them PIRs', made the baby cry all the time that it was up. took it down after a day or two.

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I went to the shooting school at shotton today, very cool and friendly, only £5 for 2 hours with your own air rifle, think I might go this week smile anyone else want to go?

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Gun club, at Column Road West Kirby, Grange Gun Club. All types of shooting including archery and air weapons.

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