500 mW VHF Video Transmitter

Posted on Feb 5, 2014

Tuned circuits consist of C4, L1, C8, L3, and the two 15 pF trimmer capacitors across the collectors and emitters of both transistors. Other NPN transistors like BC54, 2N3642, 43, etc should also work. The circuit is designed for simplicity, so No Audio has been included as this would involve adding at least an RF coupling transformer. The main use for this

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circuit is for Security Monitoring . If you use a 2N4427 or similar transistor for Q2 (output), you must use a heat sink. The 2N4427 is capable of delivering 1 Watt of RF at VHF frequencies so be sure that either a 50-75 Ohm dummy load or antenna is connected at all times before applying power.

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