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SM361  Rig Switch - Use vehicle vibration to automatically activate equipment

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This kit is for the construction of a switching unit that will activate 12 Volt vehicle equipment whenever vehicle vibration is detected.   When the vehicle is turned OFF the device starts a countdown timer that keeps the equipment operating for a pre-selected time period before it is automatically shut down.
The Rig Switch has three different levels of sensitivity to trigger timer events and five different time delay periods.  

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SM204 /SM205  UHF  Transmitter/Receiver kits for radio Fox Hunt gaming

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When assembled, this unit is a compact 2 miliwatt transmitter on the UHF frequency of 433.920 MHz. into a simple wire antenna.  It transmits a distinctive 2-tone squawk at 1 second intervals.  Between transmitter pulses it also has a receiver on the same frequency, so that it may be remotely stopped and started from its hidden location.  

Normal range is 100-250 metres, depending upon the hiding place.   An integral microprocessor allows it to respond to 1 of 16 address codes. (selectable from an internal switch).   Very educational to build and operate.


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This receiver kit matches the SM204 Transmitter.  When assembled, the unit will allow the operator to listen for and locate the hidden transmitter via speaker or headset and a simple beam antenna.  
The SM205 also includes a small transmitter that can be used to remotely activate/deactivate  the matching SM204 hidden transmitter.  An RF Attenuator can be turned on, allowing the operator to sniff out the transmitter for the final few metres.  A great exercise in kit building and in learning how UHF radio behaves at close quarters.   

(9V Battery, headset and beam antenna are not included, instructions on building the 5-element 
                                          beam antenna from very basic coat-hanger wire materials are included.)

                                             Click for more information...