Tx/Rx Switch

A transmit-receive switch is always required if you want to operate separate transmitters and receivers on one antenna. This has been the classic antenna relay of any transceiver for decades, but now with the advent of SDR receivers it has become popular again as an external relay.

This is because modern SDR technology offers a radio amateur excellent expansion possibilities for a normal radio: bandscope, waterfall display and much more. And to make better use of the existing antenna, the external relay switches between the transceiver and the SDR receiver. Very safe and comfortable.