Simple Location Tracking Transmitter Circuit
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GSM Trackers are great low-cost tracking devices, but they will only give you the location of the tracker within a 100 metre radius. So if you’re tracking something in an urban area, a 100 metre radius is a very large area indeed. A great way to solve this is to use a localised transmitter to track down the device within this radius. Think of a GSM tracker as being a coarse tracking device, and a localised transmitter as a fine tuning tracking device.
A localised transmitter is simply a ‘bug’ that transmits a continuous tone or beep. This can then be received using a radio scanner with a signal strength meter (such as the Icom R2 Radio Scanner). If you have a directional antenna, you can get even better results. The concept is simple, you move in the direction in which the signal increases in strength. As you get closer to the transmitter, the stronger the signal.
If you want to try your hand at a localised tracking transmitter, I found one that was recently updated. It may look complicated, but you get plenty of stability (as in the frequency doesn’t change as the transmitter warms up) without using crystals (which add lots of complexity to a circuit).
The site that hosts the circuit diagram features lots of other spy circuits. So you’ll enjoy looking around!
