Säge-Ton-Generator (PLL Unijunction)

This 288 MHz generator was designed for use in a transverter (transceiver converter) to allow a two-metre ( 144 MHz) transceiver to operate on the 70 cm ( 432 MHz) band. During transmission the 288 MHz signal is mixed with the 144 MHz output of the transceiver, the sum frequency being the desired 432 MHz signal.