5 Watt UHF TV Linear amplifier

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This circuit is also Crossed to: , UHF circuit

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.

The transistor case is the SOT-122A and be careful because the transistor is very toxic for your health. Tuning can be achieved turning the two variable capacitors. Do not forget to use heat sink for both transistors, specially for the BLW89 and it would

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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