Active stand-by radio transmitter

摘要

The arrangement consists of a first transmitter (1), a second transmitter (2), a directional coupler (3), two switch-over units (4, 5), the antenna (6) and a dummy load (7). The transmitters operate at the same power level and the same frequency, but with a phase difference of 90 degrees. The directional coupler (3) is a 3db coupler, while the switch-over units (4, 5) are built as high frequency two way switches. The reserve circuit configuration uses the first switch-over unit (5) in the position b and the second switch unit (4) in the position a, so that only the second transmitter sends out a signal.