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To build a Spectrum analyzer I needed a tuner. I also needed to learn how to control the tuner. In some old broken TV I found the tuner UV916. It is a common used tuner. The tuner is PLL synthesized controlled and the frequency can be set from 80-900MHz. The tuner is programmed by a digital interface I2C standard using only 2 wires. The output from the tuner is European standard 38.9 MHz. By connecting the tuner to a radio receiver circuit, tuned to 38.9 MHz, I will be able to demodulate the audio sound at the tuner frequency. With this unit I can scan and listen to all FM signals from 45-860 MHz.