The model equipment should be connected as shown in Figure 11. The numbers shown 
in circles represent cable numbers. The length and weight of the cables are shown in Table 3. 
All multiconductor cable connectors are polarized to prevent improper interunit connections. 
The motor-generator (s) should be fused according to the ratings of the propulsion motors 
to be used. Fuses should be of the slow blow type with the rating not exceeding 10 amperes. 
See Figure 49 for location. 
Connections to the output of the motor-alternator are not shown in Figure 11 because the 
alternator has a 3-phase output and the load must be equally distributed between phases. The 
output connectors are arranged in three longitudinal rows of three connectors each, with one 
row per phase. The three end connectors are for 3-phase loads or special single-phase loads, 
such as the rudder servo, where it is desired that the load operate on a phase having a partic- 
ular lead at ground potential. Power input requirements for the model equipment are listed in 
Table 2. Additional equipment, such as gyros or tracking lights, should be considered when 
distributing the load. A reference chart for typical installation is posted in the console. 
1.3 AUXILIARY EQUIPMENT 
The radio control and readout system contains circuitry which may be used in conjunction 
with other instrumentation now in use at the Model Basin. This section of the report is in- 
tended to serve as a guide to the proper installation and use of such equipment. 
1.3.1 Control Equipment 
1.3.1.1 Rudder Programming. The connector on the console marked program input 
permits a low-frequency function generator, such as the Hewlett-Packard Model 202A, to be 
used to apply repetitive signals to the rudder servo. This input may be of any wave shape; 
however, servo followage will depend on the frequency, wave shape, and amplitude of the 
applied signal. 
The signal should be applied to the AN-3102-14S-7S connector. Pin A is the chassis 
ground connection, and pins B and C are for the signal input circuit which is about 150 volts 
above ground. 
Any of the rudder-control methods may be used for setting initial rudder position after 
the function generator has been adjusted for zero direct-current output. Frequency, amplitude, 
and type of rudder motion may be adjusted by the controls on the function generator. 
1.3.1.2 Spare Tone Circuit. This tone circuit is controlled by the SPARE TONE 
switch on the power control panel of the console. This actuates a relay in the tone detector 
unit. Single-pole double-throw contact terminals are available at the SPARE TONE connector 
Type AN 3102-10S-3P on the demodulator rack. Pin B is connected to the arm of the relay and 
pins A and C are connected to the normally open and closed contacts. 
III-3 
