Page:Electronics Technician - Volume 7 - Antennas and Wave Propagation - NAVEDTRA 14092.pdf/40

 AS-2815/SRR-1

The AS-2815/SSR-1 fleet broadcast receiving antenna (fig. 2-30) has a fixed 360-degree horizontal pattern with a maximum gain of 4 dB at 90 degrees from the antennas horizontal plane. The maximum loss in the antennas vertical pattern sector is 2 dB. The vswr is less than l.5:l, referenced to 50 ohms. This antenna should be positioned to protect it from interference and possible front end burnout from radar and uhf transmitters.

ANTENNA GROUPS OE-82B/WSC-1(V) AND OE-82C/WSC-1(V)

Designed primarily for shipboard installations, these antenna groups interface with the AN/WSC-3 transceiver. The complete installation consists of an antenna, bandpass amplifier-filter, switching unit, and antenna control (figs. 2-31 and 2-32). Depending on requirements, one or two antennas may be installed to provide a view of the satellite at all times. The antenna assembly is attached to a pedestal that permits it to rotate 360 degrees and to elevate from near horizontal to approximately 20 degrees beyond zenith (elevation angles from +2 to +110 degrees). The antenna tracks automatically in azimuth and manually in elevation. Frequency bands are 248-272 MHz for receive and 292-3 12 MHz for transmit. Polarization is right-hand circular for both transmit and receive. Antenna gain characteristics are nominally 12 dB in transmit and 11 dB in receive.

AN/WSC-5(V) SHORE STATION ANTENNA

The AN/WSC-5(V) shore station antenna (fig. 2-33) consists of four OE-82A/WSC-1(V) backplaneassemblies installed on a pedestal. This antenna is intended for use with the AN/W SC-5 (V) transceiver at major shore stations. The antenna is oriented manually and can be locked in position to receive maximum signal strength upon capture of the satellite signal. Hemispherical coverage is 0 to 110 degrees above the horizon. Polarization is right-hand circular in both transmit and receive. The antenna's operating frequency range is 240 to 318 MHz. With its mount,

Figure 2-30.—A82815/SSR-1 fleet broadcast satellite receiving antenna. 2-18