Canine Radio Direction Finder


Posted on Feb 6, 2014

The basic idea is that the transmitter sends beeps and you turn the directional antenna until you get maximum signal and that is the direction of the transmitter. It doesn`t work terribly well. The reason being the antenna is quite sensitive, so even though it is directional, if the transmitter is close then you cant tell which way it is. So it only works in the sweet spot where the transmitter is far enough away for the


Canine Radio Direction Finder
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signal to be smaller when the the antenna is pointing the wrong way but not so far away that you cannot get a signal at all. For us, this range was perhaps 30 to 100 yards. Its just an audio amplifier that amplifies the signal from the RF module. The module is the other half of the transmitter module and something like this. Make sure you get an AM module - that matches the frequency of the transmitter. The directional antenn is made from a piece of wood, with lengths of retractable steel ruler attached to it. The design was taken from a posting on an Australian forum that I now cannot find. But I`m sure they wouldn`t mind my repeating it here. As I mentioned the results were a littledisappointing. But then the whole project cost about 20 USD and we had some fun. Especially wandering around the neighbourhood wearing headphones andclutchingwhat looks like a home made TV antenna. This is the kind of situation where it is best to just to cultivate a wild look in the eye and hope people don`t bother you or call the police.




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