3 Elements 2-Meter Yagi Antenna

This antenna project uses another approach in feeding the driven element. Instead of using gamma-feed dipole as its driven element, it uses a center feed dipole in combination of a 1:1 coaxial balun. This method of feeding a dipole eliminated the difficulty in tuning the driven element. The details of the coaxial balun was earlier discussed in my previous project. I build mine in less than 3 hours so this should be easy for most beginners. ---73 de hevir

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Simple Over-Voltage Protection For Regulated Power Supply

This little protection circuit can be very useful in protecting your transceiver unit. I was able to design this circuit out from my horrible experience wherein my 30 Amps Zebra power supply unit suddenly went wild exploding my 90 watts Daiwa RF amplifier. Its too late but never the less, this project will help you a lot. The original circuit uses an SCR in conjunction with a fuse but later modified it using a much simplier approach using a 12V relay. Although the author is aware by the delay of closure brought by the relay contacts but actual test showed no problem with the radio transceiver during a simulated over voltage test at the power supply.---73 de hevir