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Phase Preamp
TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
C3 and C6 Control Assembly 2A5 Detailed Functional Operation

TM 11-5820-873-34
associated circuitry. A positive amplitude signal triggers
related components. An input above + 10 VDC, to the
2A2Q13 to provide a drive signal at 2XA2-17.  A
Amplitude Level Changer, controls 2A2Q10 conduction
negative amplitude signal triggers 2A2Q14 to supply a
Transistor 2A2Q10 then regulates 2A2Q12 which
drive signal at 2XA2-V.  Transistor 2A2Q14 is cutoff,
generates a drive signal to the Amplitude Servo Preamp
terminating the L4 home function, through 2A2CR30
positive drive. If the Amplitude Level Changer input is
when a 50 ohm point is detected. Similarly, 2A2Q14 is
below + 10 VDC, 2A2Qll conducts to establish a drive
cutoff at L min through 2A2CR23 and by an inhibit
signal to the Amplitude Servo Preamp negative drive.
signal through 2A2CR27. Transistor 2A2Q13 is cutoff at
i. L4 Home Flip-Flop. Diodes 2A2CR14, 2A2CR15,
L max through 2A2CR22 and by an inhibit signal
2A2CR17, gates 2A2U4A-B and associated components
through 2A2CR26
make up the L4 Home flip-flop. A logic 0 is established
at 2A2U4A-3, by 2A2C32, when power is first applied.
m.  Phase/Amplitude Brake. The Phase/Amplitude
An L4 home signal, logic 0 at 2XA2-14, to 2A2U4A-2
Brake is made up of 2A2CR18, 2A2CR19, 2A2CR31,
sets the FF for logic 1 at 2A2U4A-3. Amplitude Servo
2A2Q8,  2A2Q9  and  related  components  Normal
Preamp transistor 2A2Q14 is triggered by the logic 1 to
operation is with both 2A2Q8 and 2A2Q9 conducting. A
generate a drive signal at 2XA2-V. At the same time,
ground is maintained at 2XA2-12 by 2A2Q8 and at
the logic 0 at 2A2U4B-6 is fed to L4 Drive Inhibit. The
2XA2-T by 2A2Q9. Braking occurs when one and/or the
2A2U4A-3 logic 1 is maintained until L4 mm is
other transistor is cutoff. Both transistors are cutoff by a
achieved.  Either an L minlogic 0 or positive phase
logic 0, on the 50 (-) line, at 2XA2-10. The logic 0 is fed
angle logic 0 applied to 2A2U4A-3 resets the L4 Home
through 2A2CR18 to 2A2Q8 and through 2A2C19 to
2A2Q9.  An L mm logic 0 will also cutoff 2A2Q19
through 2A2CR31. When cutoff, the output of the cutoff
j.  L4 Force Flip-Flop.  The L4 Force Flip-Flop
transistor goes positive. This positive voltage that is the
consists of 2A2CR12, 2A2CR16, 2A2U4C-D, 2A2U5B-
braking signal to the Servo Motor Control Assembly
C-D and related components. When power first comes
on, 2A2C31 causes the FF to reset with logic 0 at
2A2U4C-8. A reset also occurs with an L4 Home signal.
2-16.  Regulator Board 2A3 Detailed Functional
This logic 0 signal is applied to 2A2U4C-8 through
2A2CR12. It is necessary to prevent L4 Home and L4
(Fig FO-32)
Force flip-flops from being on simultaneously. The FF
The Regulator Board contains an RF detector comprised
is not set, logic 1 at 2A2U4C-8, unless 2C1 reaches max
of 2A3R2, 2A3CR1, 2A3CR2 and 2A3C4 and a voltage
and 2L4 reaches min and an untuned condition still
regulator The RF detector senses the presence of RF on
exists. Since both 2C1 and 2L4 have reached limits, a
the transmission line The detector output is a reduced
force function is required to drive 2L4 toward maximum.
level of the positive signals only The voltage regulator
This action is necessary to create a positive phase angle
provides a filtered + 5 VDC level It also provides some
so tuning can continue. The C max and L mm logic 0
filtering for the + 10 VDC line and the + 28 VDC
signals are applied to 2A2U5B after being inverted by
switched line.
either 2A2U5C or 2A2U5D. The 2A2U5B-6 logic 0 is
Filter Board 2A3A Detailed Functional
applied to 2A2U4C-9 and sets the L4 Force FF. The
logic 1 on 2A2U4C-8 is fed to the Amplitude Servo
(Fig FO-32)
Preamp to drive 2L4 toward maximum inductance.
The Filter Board provides RF filtering to keep RF off the
When a positive phase angle occurs, L4 Force FF will
antenna coupler control cable. Each input and output of
be reset by logic 0 through 2A2CR16 to 2A2U4C-8. If
the antenna coupler passes through a separate filter
the force function continues until L max, the FF will be
network on this board. The filters are standard pi type
reset by logic 0 through 2A2CR24 to 2A2U4C-8.
configuration with capacitors and choke.
k.  Drive Inhibit.  Gate 2A2U5A, diode 2A2CR25,
2-18. Phase and Amplitude Detectors 2A4 Detailed
transistor 2A2Q15 and associated resistors comprise
Functional Operation
this circuit. If either L4 Home FF or L4 Force FF is set,
(Fig FO-32)
then 2A2U5A-3 has a logic 1 output.  The logic 1
Board 2A4 provides the outputs necessary to initiate
triggers 2A2Q15 to short out any drive signals to the
driving 2C1 and 2L4 for tuning Its outputs are
Amplitude Servo Preamp.  Transistor 2A2Q15 is also
proportionate to inductive and/or capacitive phase
triggered through 2A2CR25 with a logic 1, 50 (+) signal.
differences and amplitude variations above and below
Again, the drive signals to the Amplitude Servo Preamp
are shorted out. This action stops the drive to the servo
preamp anytime reflected power is below threshold.
l.  Amplitude Servo Preamp.  Contained in the
Amplitude Servo Preamp are 2A2CR22, 2A2CR23,
2A2CR27, 2A2CR28, 2A2CR30, 2A2Q13, 2A2Q14 and

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