A two-channel power amplifier with a diplexer output

To sum up the powers of two independent signals from a two-channel amplifie r, a diplexer constructed with the use of small-sized directional couplers is used. The level of the intermodulation components of the output spectrum is decreased down to -60 dB. The output power of the signals is 10 and 75 W, respectively; the gain of the channel amplifiers is 40 dB; and the ampli fied signals are the video and audio signals of the TV channel 12.