Assembling a Niftymitter v0.24

Step 5 Test and tune Niftymitter

Attach a 9V 'C' type battery to the PP3 clip and turn on the transmitter. Turn over the circuit box to access the tuning control. Use a small 3mm slot headed screwdriver or a trim tool to adjust the 'trimcap' . This is a small brass coloured component accessed by the hole marked 'tuning'. Clockwise for up, andticlockwise for down, it only requires very fine adjustment.

Place a radio receiver at least 2m way and tune it to the desired frequency. Then carefully adjust the trimcap until silence is heard at the receiver. Test the signal by moving the receiver or transmitter away from each other to ensure you have not tuned into a harmonic signal.