This small circuit is a Linear amplifier for driving small UHF TV transmitters. Its gain is 7dB and can amplify a signal between 450-800 MHz. You can drive the circuit with 1 to 1,5 Watts signal. Better use double layer PCB with the second layer connected to earth. Use a stabilized power supply 25 volts and at least 5Amps.
Datasheet file1: Click here to download 1N4148.pdf datasheet. Datasheet file2: Click here to download BLW98.pdf datasheet. Datasheet file3: Click here to download BD136.pdf datasheet.
Comments
Andy wrote on Dec 19, 2008
Sadly this article has missed off some vital information.
The transistor should have a strip line load in the collector.
Also the output circuit needs a quarter wave line to effect an impedance transformation to the output 50 ohm load
.... wrote on Jan 5, 2009
input and output is RF ?..
pouchytech1012@yahoo.fr wrote on Jun 19, 2010
only this transistor is toxicing
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