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T.O. 12P4-2APX-192
NAVAIR 16-35TS1843-1
TM 11-6625-1646-25
preventing A3Q3 from charging A3C4 and disabling the
pulse, is routed to a monostable multivibrator (A4Q7 and
operation of the Monitor mode reply evaluator. A3Q7 will also
A4Q8). A4Q8 is normally on with A4Q7 being normally off.
be provided a low impedance path to ground, causing A3Q7 to
When the negative-going pulse is applied to the collector of
conduct. The test gate input from the mode generator at the
A4Q7 and the base of A4Q8, A4Q7 is turned on and A4Q8 off.
base of A3Q7 is amplified and inverted. The inverted gate is
The output of A4Q7 developed across A4R25, is +5 volts in
applied to a three input NAND gate (A4A3C, pins 4 and 5) in
amplitude and 0.35 usec in width.  The positive-going 0.35
the comparator-decoder module (A4).  The output of the
usec pulse is applied to decoding gate A4A3A, pin 9. Also
NAND gate is then routed to the In-Flight test reply evaluator.
applied to the three input NAND gate is the 19 usec negative-
5-31.  In the In-Flight test reply evaluator, with no signal
going gate (paragraph 5-27) from A4A2 at pin 10 and the
applied, A3CRll is back biased by +5 volt allowing A3C8 to
power monitor trigger pulse at pin 11 (paragraph 5-26). The
charge through A3R21 and A3RT1 driving A3Q9 into
bracket spacing is decoded when the 19 usec negative gate is
conduction. This action sets the Schmitt trigger so that A3Q10
gone and the power monitor trigger pulse coincides with the
is on and A3Qll is off, back biasing A3CR12 of the time enable
0.35 usec pulse. A negative-going pulse is developed and is
OR gate by 12 volts, preventing operation of the lamp driver
applied to the output pulse shaper A4A4, a monostable
network. When an input pulse is applied, the back bias is
multivibrator. A4A4 generates a 0.45 usec pulse which, along
removed from A3CRll allowing A3C8 to discharge. At the end
with the high output of A4A6 and the high output of the
of the pulse A3CRll is back biased and A3C8 charges again at
frequency power comparator, is routed to the output enable
a rate that produces a. sawtooth waveform. When the input
NAND gate A4A3B, pins 1, 2, and 13. The negative-going
interrogation rate is at least 80 percent of the 400 PRF internal
pulse output of A4A3B is routed to pulse shaper A4A5, a
interrogation, the D.C.  level of the sawtooth waveform will
monostable multivibrator. The positive 25 usec high output of
lower sufficiently to cutoff A3Q9, causing the Schmitt trigger to
A4A5 is routed to a three input NAND gate A4A3C, pin 3. The
abruptly change states, removing the back bias on A3CR12.
output of A4A3C is then applied to A3Q3.
5-32. In the lamp driver circuit, A3CR12 and A3CR13 (lamp
enable OR gate), are normally back biased allowing A3Q12 to
figure FO-4). The input to the Monitor mode reply evaluator, a
conduct. This keeps A3Q13 off which removes the ground
negative-going 25 usec pulse, drives the base of A3Q3
circuit for the base of A3Q14 and keeps the lamp switching
towards zero cutting off A3Q3. This allows A3C4 to charge
transistor A3Q14 and indicator lamp off. When either A3CR12
through A3Rll for the duration of the pulse. A3C4 charges to
or A3CR13 are forward biased, A3Q12 is turned off allowing
approximately 0.3 volts during this 25 usec period. At the end
A3Q13 to conduct. This provides a low path to ground for the
of the 25 usec period A3Q3 is turned on, back biasing A3CR7
base-emitter junction of A3Q14 allowing A3Q14 to conduct for
and holding the charge on A3C4 constant. When the next
the duration of the forward bias state of A3CR12 or A3CR13,
pulse is received, the process is repeated with the charge
and providing 28 volts for illuminating the TEST lamp.
produced being added to the charge already present on A3C4
5-33. POWER SUPPLY (See figure FO-4). The power supply
from the previous pulse.  After seven or more consecutive
for the TS-1843A is a combination series hunt type voltage
pulses occur at a repetition rate of 100 pulses per second, the
regulator with two outputs of +12 and +5 volts.  Transient
voltage at the emitter of unijunction transistor A3Q4 will be
diode A3CR1 is located at the input of the power supply and
sufficient to trigger A3Q4, discharging A3C4 and generating a
has a dual purpose function.  A3CR1 clips any negative
pulse across A3R17. With the monostable multivabrator in the
transient through ground and prevents any voltage above +36
state of A3Q5 on and A3Q6 off, diodes A3CR6 and A3CR8 are
v from entering the power supply. The control amplifier, A3Q2
back biased allowing A3C4 to charge as described above.
is normally on, holding the voltage across the 11.8 volt zener
When a pulse is applied to the emitter of A3Q5 and A3Q6,
diode, A3CR3 and the base of A3Q1 to approximately zero.
A3Q5 is turned off and A3Q6 is turned on. When A3Q5 is
When either the RAD TEST-MON switch or one of the mode
turned off A3CR6 is forward biased through A3R12 and A3R19
switches are depressed, the switch lead to the power supply is
preventing any incoming pulses from affecting A3Q3. A3C5 is
grounded through a diode in each switch lead, grounding the
also allowed to charge through A3R12 and A3R19 until the
base of A3Q2. A3Q2 is then turned off and allows the voltage
charge across A3C5 is sufficient to trigger A3Q4 again through
across A3CR3 to rise to approximately 13 volts. Shunt diodes
A3CR8. When A3Q6 is turned on A3CR13 of the lamp enable
A3CR4 and A3CR5 compensate for temperature changes in
OR gate will be forward biased for a minimum of two seconds.
A3Q1 and A3Q2 as well as compensating for the voltage loss
When A3Q4 triggers for the second time, a pulse is generated
across the emitters of A3Q1 and A1A2Q1.  With 13 volts
across A3R17 which re-sets A3Q5 and A3Q6 to their original
applied to the base of A3Q1, A3Q1 is allowed to conduct. The
states as well as back biasing A3CR6 and A3CR8. This action
output at the emitter of A3Ql is approximately 12.5 volts and is
will also back bias A3CR13 of the lamp enable OR gate.
applied to the base of AlA2Ql causing AlA2Ql to conduct, +12
5-30. When any of the mode selector switches on the Control
volts is then available at the emitter of AlA2Q1l. The +12 volts
Unit are depressed, a high input is applied to the base A3Q8,
is routed to A3R4 where
causing A3Q8 to conduct. With A3Q8 conducting, a low path
to ground through A3CR10 is provided for A3Q3, thus

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