and B of the AN 3102-12S-3S connector on the readout unit marked Spare Tone. The output of 
the circuit is available at terminals of the AN 3102-14S-5P connector marked Spare Tone Con- 
tacts on the console. Pin A is connected to the arm of the single-pole double-throw relay and 
pins B and C to the other contacts. The contact rating is 1 ampere at 24 volts d. c. or 115 
volts a. c. 
1.3.2.6 Modulation Input. The readout unit of the model equipment has a modula- 
tion input connector which may be used for mixing the outputs of additional subcarrier channels 
with those in the existing readout system. A readjustment of the modulation schedule will be 
required to prevent overmodulation of the transmitter. 
1.3.2.7 Tracking Lamp Control. The rudder running-time circuitry of the readout 
unit contains a relay which is energized only when the rudder servo is running. A spare set 
of single-pole double-throw contacts is connected to the tracking lamp connector on the unit. 
Pin B is connected to the arm of the relay and pins A and C to the other contacts. The 
contact rating is 1 ampere at 24 volts d. c. or 115 volts a. c. 
1.3.3 Intercommunications System 
The meter panel of the console contains a permanent magnet speaker which may be 
used as a speaker or microphone in a conventional push-to-talk multistation system. Change- 
over from listen to talk is controlled by a treadle-type switch on the console footrest. Con- 
nections are made via an AN 3102-14S-6P connector on the treadle switch. Pins A and B 
connect to the ‘‘talk’’ circuit and pins C and D to the ‘“‘listen”’ circuit. 
2. OPERATION 
2.1 STARTING PROCEDURE 
Shore — 1. Check all power, antenna, and readout cable connections. 
2. Place all POWER switches on the console in the OFF position. 
3. Switches for the panel meters are located on the rear of the control and 
readout unit. Place switches for unused channels in the OFF position. 
See Figure 18. An ON-OFF switch for the rudder running time indicator 
is located on the deck of the control and readout unit. See Figure 19. 
Place in the OFF position if running time circuit is not to be used. 
4. Place OPERATE-STANDBY switch in the OPERATE position. 
5. Check voltage of regulated line on panel voltmeter. Voltage should 
not exceed 120 volts. 
6. Turn READOUT and OSC POWER switches ON. 
Model — 1. Place switch on the alternator in the OFF position. 
2. Place all other power switches on model equipment in the ON position. 
III-5 
