1.3.1.3 Modulation Output. The modulating signal, applied to the control circuit 
transmitter, is available at a UG-291B/U connector in the console. This may be used for re- 
cording the modulation signal applied to the transmitter. 
1.3.2 Readout Equipment 
1.3.2.1 Rudder Channel. An analog current or voltage, proportional to rudder 
position, is available for external recording at the console connector marked Analog Rudder. 
Terminal A of the AN 3102-14S-1S connector is chassis ground, and terminals B and C are the 
differential signal output which is about 45 volts positive with respect to ground. This output 
is in parallel with the meter on the console so any external load should be of constant imped- 
ance and draw 1 milliampere or less. Maximum output voltage is about +3 volts. The console 
meter may be recalibrated by use of the centering and sensitivity controls on the discriminator, 
but separate calibration circuitry must be used for the external equipment. 
If an analog-to-digital converter is used in the model as described in Section II, 5.1.1.2, 
a digital output may be obtained from the Cannon Type XL-3-14 connector marked Rudder Angle. 
Pin 1 is ground, pin 2 is the pulse output, and pins 1 and 8 are connected to a relay which may 
be used to control a port-starboard marker. The pulse output may be connected to any standard 
events-per-unit-time meter. Peak pulse amplitude is approximately 25 volts into a 600-ohm load. 
Pulse output rate is 10 pulses-per-second-per-degree of rudder offset. 
1.3.2.2 Propulsion Shaft Rpm. A pair of Cannon XL-3-14 connectors are provided 
for accurately indicating or recording propulsion shaft rpm on digital equipment. Pin 1 is 
ground, and pin 2 is the pulse output. Pulse amplitude is about 25 volts peak into a 600-ohm 
load, and repetition frequency is 10 pulses per revolution. The output of these circuits may be 
used to drive the TMB Revolution-Speed-Time Recorder Type 223, which automatically prints 
out rpm on a Clary Printer. Standard commercial events-per-unit-time meters and printers may 
also be used. 
1.3.2.3 Spare Analog Channel. The connections to and use of the spare analog 
channel are the same as for the analog rudder circuit. Output is obtained from the connector 
marked Spare Channel. 
1.3.2.4 Receiver Output. The receiver output, of the model-to-console data link, 
is available at a UG-291B/U connector on the console. This may be used for recording the 
composite readout data on tape. It may also be used for driving additional discriminators if 
more readout channels are added to the readout system. 
1.3.2.5 Spare Tone Circuit. A spare tone circuit is included in the model-to-shore 
data link. The tone circuit may be energized by connecting switch contacts to terminals A 
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