PART I! — SYSTEM DESIGN 
1. DISCUSSION 
This portion of the report describes the complete system in a functional breakdown. 
The radio frequency and subcarrier portions of the system use standard telemetering com- 
ponents for the proportional control and readout functions. Potentiometer-controlled subcarrier 
oscillators are used for all proportional channels except the rpm readout channels which use 
reactance-controlled oscillators. Miniature subcarrier discriminators* are used in the receiving 
circuitry for separation of proportional signals. Low-frequency tone generators and detectors 
of the electromechanical type are used for the remote control of all on-off functions such as 
power control and propulsion motor reversing. 
Power for all model equipment is furnished by nickel-cadmium batteries which may be 
rapidly recharged between trial runs. The widely varying battery voltage is applied to a 
governor-controlled motor-alternator which supplies 400-cycle instrumentation power and to 
one or two motor-generators for control of propulsion power. The motor-alternator has reserve 
capacity for powering gyros and other special model circuitry requiring 400-cycle power. The 
battery-charging and power-control circuitry is arranged for simplified operation and the use 
of a minimum amount of equipment in the model. 
The basic readout circuitry included with the system is only enough to guide the operator 
in controlling the model. Connections are provided for recording these data on external equip- 
ment. One spare proportional data channel has been included for use in certain tests in which 
it is desirable to initiate a new command when the model attains a specific rate of turn or 
heading angle. Connections have been included for adding up to twelve additional subcarrier 
data channels to the readout circuitry. 
The 400-cycle power for the instrumentation in the model is rectified and regulated by 
semiconductor circuitry. Power supplies for all console equipment operate on the 60-cycle 
power lines and use vacuum tube regulators 
2. RADIO-CONTROL AND TELEMETERING LINKS 
Standard FM-PM telemetering equipment is used in the radio frequency and subcarrier 
portions of the radio-control and data-readout system. The block diagrams of the control 
equipment are shown in Figures 1 and 2. Figures 3 and 4 show the block diagrams of the 
readout circuitry. 
*The discriminators are called Demultiplexers by the manufactuer. 
II-1 
