To find the power gain ratio corresponding to a 3 dB change in level, use the formula:

The table showing the amplification factor if you know the power gain in dB

Use this fm antenna amplifier in areas where the signal reception of FM stations is too bad.
This circuit is just the right thing to do it. It is designed in such a way that the supply current powering it flows through coaxial cable. With this technique, an extra cable to power the fm antenna amplifier is unnecessary. The RF signal and the DC current supplying the amplifier use the cable simultaneously. Check another FM antenna booster circuit diagram.

This mosfet fm transmitter circuit is designed to be used for aligning FM radio receivers. It has a microphone amplifier with automatic gain control. The FM modulation is a voltage oscillator and the final stage is built with MOSFETs. A lowpass filter at the output assures the transmission of a clean 10 … 50 mW FM signal. IC1 works as an amplifier supplying a negative control voltage to FET T1. The amplitude of the amplified audio signal can be adjusted through P1. The carrier frequency is generated by the oscillator T2.

Here you can download the service guide manual which contains the components list, schematics, layouts and troubleshooting of the LCD TV Thomson 32LB220B4/U on Chassis IFC228-LCD.