Start of Blog

In this Blog I will describe the design and construction of a 144 MHz transceiver.
The goal is to build a FM tranceiver from scratch. The frequency range must be: 144 MHz to 146 MHz in steps of 12.5 KHz. It should be possible to use repeaters.
The frequency must be controlled by a PLL. A microcontroller will control the PLL.
Output power will be at least 5 Watt.


A prototype exists on a breadboard . Basically it works but it still needs a lot of work.

This picture shows the receiver (left), the modulator (middle) ,the PA (right) and the lowpass filter.

The picture shows the microcontroller (left), the PLL unit (middle) and the receiver (right).

These units including a power suppy will be build into a 19 Inch Box. I am not sure if the power supply will fit.