Figure 1-25.—AN/SMQ-11 dual frequency array antenna.

Figure 1-25.—AN/SMQ-11 dual frequency array antenna. subsystems, the main subsystem, the communications module subsystem (COMM MOD), and the satellite module subsystem (SAT MOD). Each subsystem consists primarily of a laptop computer that can be used as a stand-alone system, depending upon mission requirements. The main subsytem contains a multiple application software library dedicated to many aspects of METOC support. The IMOSS comes equipped with a printer. The SAT MOD consists of a laptop computer that contains a built-in satellite receiver and processor. It also includes a VHF receiver/demodulator and two antennas. One antenna is an omnidirectional antenna used to copy APT signals and the other is used to copy signals from the WEFAX broadcast. The SAT MOD is equipped with special software modifications that can be used independently from the main IMOSS computer. Satellite imagery received via the satellite module may be transferred to the main IMOSS computer by using a 1.44MB data disk. All com- ponents are equipped with protective cases (fig. 1-26). Because the APT antenna is omnidirectional, no antenna aiming is required to track polar-orbiting satellites or geostationary satellites. When the system is powered up, the receiver will automatically scan satellite frequencies, detect imagery signals, and acquire the imagery. The WEFAX antenna must be manually oriented toward the geostationary satellite during initial setup of the system. For planning, the system contains software that displays orbital predictions and line-of-sight receiver ranges for the polar-orbiting APT and geostationary satellite WEFAX transmissions. Menu options on the liquid crystal display (LCD) screen guide the operator 1-29