one pulse so that the 1-cps pulse and the WWV pulse can be aligned. The second method is 

 simpler and can be used when good radio reception is available between the submarine and 

 the laboratory ship. A timing pulse is sent from the laboratory electronics to the submarine. 

 Pushing a button interrupts the operation of the divider when it has reached the correct state 

 for synchronization. A pulse from the laboratory electronics starts the divider chain again 

 at the correct time. 



The timing package also provides signals for driving both the AN/UQC-IA, which uses 

 a 2.5-kc signal, and the 50-kc power amplifier. A pulse 20 msec wide at 2.5 kc is generated 

 every 4 sec. Every 1, 2, or 4 sec, as preselected by the operator, a 20-msec wide, 50-kc 

 pulse is generated. 



CONTROL BOX 



The function of the control box is to provide, on command, a predetermined number of 

 pulses or a continuous pulsing which may be secured at the operator's discretion. 



When in the automatic position, the control box, upon command of the operator, keys 

 the ANAJQC-IA and begins gating pulses from the timing package into the AN/UQC-IA. When 

 the number of pulses reaches two or four, as selected by the operator, the AN/UQC-IA trans- 

 mission is stopped. 



The sequence of events is as follows (see Logic Diagram, Figure 4): The operator 

 depresses SW-1, putting a positive pulse at the "zero" side of Flip-flop Q-1; this pulse sets 

 Q-1 to the "one" condition. With Q-1 in this position, two events take place. First, the 

 transistor controlling the relay is forward biased, closing the relay; and second, the AND 

 gate logic is so biased that the gate is opened and the 4-sec pulses are passed when they 

 occur. Flip-flops Q-2 and Q-3 function as a counter; they count the 4-sec pulses, as they 

 occur, to a count of two or four depending on the position of SW-2. When the proper count 

 has been reached, a pulse is sent to Q-1, which resets it to the "zero" state, causes the 

 relay to unlatch and the AND gate to close, and resets Q-2 and Q-3. In the "continuous" 

 switch position (SW-3), the relay is closed, the AN/UQC-IA is keyed continuously, and a 

 modulation signal is fed to it for a period of 20 msec once every 4 sec coincident with the 

 4-sec pulse. 



50-KC POWER AMPLIFIER AND TRANSDUCER 



The function of the 50-kc power amplifier and transducer (Figure 5) is to generate an 

 acoustic pulse at 50 kc and to transmit this pulse through the water to a receiving hydrophone. 



This function is accomplished through the use of a vacuum tube amplifier. The first 

 section is a simple pulse amplifier which drives three cascaded Class C tuned amplifiers to 

 develop a peak power of 200 w. The output of the power amplifier is matched to a coaxial 

 line by Transformer T-1 and is matched from line to transducer by Transformer T-2. 



