(5) Accuracy (operational): + 80 feet with 99% probability. 



(6) Power required: 117 v, 50-1000 cps , 100 watts . 



b. Remote Electrical Track Plotter Model 429 



(1) Plotter scale: 1" = 4000" to 1" = 2000' or 1" = 8000" 

 by a simple gear change at the screw box . Special 

 ranges of 1" = 1000' are available. 



(2) Accuracy of plot: + 5 feet at any range . 



(3) Method of track marking: sequential dot marking, 

 either automatic or manual . 



(4) Cable and interconnections: Plotter to control unit 

 requires single 12 -conductor cable. 



(5) Power requirements: 117 v, 60 cps , 250 watts . 



c . Radar Transponding Beacon Model 427 



(1) Frequency band: X-band. 



(a) receiver ¥ 9375 mc adj . ± 50 mc . 



(b) transmit = adj. 9100-9400 mc . 



(2) Maximum pulse repetition rate: 2000 pps . 



(3) Return pulse spacing: adjustable (3-19 millisec) . 



(4) Maximum peak power output 100 watts . 



(5) Antenna polorization: horizontal omnidirectional with 

 8° vertical beam width . 



(6) Power requirements: 12 v, dc . 



(a) Receiver ^ 1/4 watt (normal quiescent state) 



(b) Transmit = 16 watts (when interrogated at 2000 pps) 



(7) Warm -up time (approx .): 30 sec. 



d . Radar Beacon Receiver 



(1) Frequency range: adjustable 9100-9400 mc to match 

 with transponder as required . 



(2) Receiver mounting: close coupled to wave guide. 



141 



artbxtr ai.ll.ittlc,l(nr. 



