RF Circuits

This is the PCB board layout for a small LPFM transmitter that i'l showed on Youtube. This new design is even more powerfull, using 4 instead of 2 transistors. The range will go up to 2 kilometers or even 4 - 7 km using een external twinlead fed 300 ohm folded dipol antenne. Or use just 2 transistors for less range using a 100 Ohm Emitor resister instead of the 33 Ohm for lower battery consumption.

Take good notice by placing the transistors , for the BF 199 the connections are 1 Basis 2 Emittor 3 Collector. One set transistors is placed 180 degrees backward , be sure all the collectors are connected at the antenna loop.