The processor at each site can be combined with the processor for the test instrumentation at a single location, and this is proposed as detailed in Figure 13-2. The ranges noted relate to the Venus Site collimation tower (1.6 km) for Phases I and II and to a new receiving site (~10 km) for Phase III. 13.3.2 PHASE I A single axis array, 2M x 18M, is used in Phase I with nine subarrays, 2M x 2M, to provide electronic beam steering in azimuth as shown in Figure 13-3. Phase control is accomplished with all control circuits and driver klystrons, but without the output amplitrons. Phase reference beam and power distribution sensors are located at the Collimation Tower for demonstration of adaptive and command modes of beam steering. The transmitting Array inay be located either on top of the Venus Power Amplifier Enclosure at the rear of the dish or on the quadrapod at the front of the dish. The former location avoids time and cost to reconfigure the facility for space science and tracking missions. 13.3.3 PHASE II The single axis array has 5 kW amplitrons added in Phase II: eight per subarray for a total power output of 360 kW as shown in Figure 13-3. Each subarray would be as shown in Figure 13-4. Amplitrons are air cooled. Eight cascaded amplitrons should be adequate to demonstrate phase performance in each subarray, and all 72 amplitrons can be driven in cascade to demonstrate both phase control (with mechanical beaxn steering) and RFI characteristics. Subarrays can be mechanically adjusted to simulate thermal distortion effects, and various illumination tapers can be examined. A number of rectenna subarrays are tested in preparation for Phase III and to demonstrate de-dc efficiency. The transmitting array mounting is the same as Phase I, and the receiving system remains at the collimation tower, where the beam pattern will be shown in Figure 13-5. The horizontal plane pattern is used for the control demonstration.
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