Wide-band ultrahigh-frequency over-the-horizon equipment

Wide-band o/h (over-the-horizon) radio equipment in the 680- to 900-mc (megacycle) band suitable for use in toll-quality multichannel telephone or TV (television) circuits is described. The system comprises 60-foot parabolic antennas fed with dual polarization horns, 10-watt drivers, 10-kw amplifiers using 6-cavity klystrons, and receivers which permit dual or quadruple diversity by combining the received signals at the IF (intermediate frequency). The over-all 1-db (decibel) bandwidth is 15 mc, and the time delay distortion characteristics are suitable for interconnection with existing toll-quality radio links.