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Control Logic Board 2A1 Detailed Functional Operation
TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
Phase Preamp

TM 11-5820-873-34
coupler control, controls 2A1Q1 operation The gain
g. C3/C6 Control Assembly. Components 2A1Q6,
input establishes the reflected power threshold that
2A1Q7, 2A1U2 and their associative circuitry make up
causes 2A1Q1 conduction Transistor 2A1Q2 converts
the C3/C6 control Capacitor 2C3 is switched in and out
the 2A1Q1 output into an on/off output characteristic of
of the circuit in the following way. Each time the time
reflected power When 2A1Q2 conducts, it represents
delay runs out, 2A1U2C inverts the logic 0 from Time
reflected power above threshold With 2A1Q2 off,
Delay 2AlQ18 to logic 1. The logic 1 (2A1U2-8) then
reflected power Is below threshold and a positive
triggers 2A1Q6 to provide a ground at 2XA1-17 which
voltage is felt at the base of 2A1Q3 Transistor 2A1Q3
energizes bistable relay 2A5K2. Bistable relay 2A5K2 is
conducts when reflected power is below threshold and
the control for 2K3 which controls 2C3A-B Control of
its collector is at ground The 50 (-) output of board 2A1,
2C6 also utilizes a bistable relay, 2A5K1 It is controlled
at 2XA1-8, is taken from the collector of 2A1Q3 Also,
by 2A1U2A-B-D The L max signal, a logic 0, is produced
2A1Q3 drives 2A1Q4 Transistor 2A1Q4 and associated
when 2L4 reaches maximum inductance. This logic 0
components establish a short time delay The time delay
comes in on 2XA1-T to 2A1U2D and is inverted. The
prevents brief intervals of reflected power drop from
logic 1 at 2A1UD-11 then triggers 2A1Q7 to provide a
terminating a tuning cycle The 2A1Q4 output operates
ground at 2XA1-V. That ground toggles 2A5K1 into its
2A1Q5 to provide logic outputs characteristic of
opposite state. This action either switches 2C6 in or out
reflected power level A logic 1 from 2A1Q5 indicates
across 2L4, depending on its previous condition. If 2C6
reflected power below threshold The logic 1 is fed to
is switched across the 2L4, +28 VDC is also switched on
Tune FF 2A1U4C-9 to terminate the tune cycle Diode
to 2XA1-U. This +28 VDC is reduced to a logic 1 level
2AlCR1 and resistor 2A1R7 in the Reflected Power Amp
by voltage divider 2A1R19 and 2A1R20. The logic 1 is
cut it off during receive mode This prevents keying
then fed to 2A1U2B-5 and a logic 0 is then present at
spikes from causing the CPLR STATUS FAULT
2A1U2B-6.  That logic 0 is inverted by 2A1U2D and
indicator to come on when unkeying.
again 2A1Q7 is triggered Bistable relay 2A5K1 is
toggled into its opposite state and 2C6 is either switched
in or out across 2L4.  It should be noted that if 2L4
e. Time Delay.
The time delay consists of
reaches L min and 2K2 is not energized, 2A5K1 will not
2A1Q16, 2AlQ17, 2AlQ18 and their related components
be toggled. Also, if a tune cycle is initiated, 2A1U2A
Variable resistor 2A1R46 adjusts the length of the time
has a logic 0 output. At this time, if 2C6 is across 2L4, it
delay The normal time delay setting should be
will be removed.
approximately 40 seconds Time Delay operation is as
follows When a tune cycle is initiated, the collector of
2A1Q16 rises to near +VDC Capacitor 2A1C40 begins
Lamp Driver.
charging thru 2A1R47 and the anode of 2A1Q17
indicators, on the antenna coupler control, are controlled
increases toward +5 VDC Transistor 2A1Q17 is a
by 2A1Q9, 2A1Q11 and/or 2A1Q12.
These lamp
programmable unifunction transistor that fires when the
drivers are turned on by logic signals at the appropriate
anode voltage reaches the voltage applied to the gate
times.  The CPLR STATUS FAULT lamp driver is
Voltage divider 2A1R49 and 2AlR50 sets the gate
2A1Q12. It is triggered on anytime the Fault FF has a
voltage at approximately +5 VDC When 2A1Q17 fires,
logic 1 at 2A1U4A-3 Lamp driver 2A1Q11 lights the
the positive pulse triggers 2A1Q18 and 2A1Q18
CPLR STATUS READY indicator. This happens with a
collector produces a logic 0.  The logic 0 resets the
logic 1 from the Tune FF at 2A1U4D11 CPLR STATUS
Tune FF thru 2A1CR21 and the Fault FF thru 2A1CR20.
is lit by 2A1Q9 with a logic 1 from Tune FF 2A1U3B-6.
This terminates the tune cycle and lights the CPLR
STATUS FAULT indicator Diode 2A1CR26 places a
2-15. Phase and Amplitude Control
logic 0 on the L max line to terminate the L force
Board 2A2 Detailed Functional Operation
function at the end of the time delay.
(Fig FO-7 and FO-34)
f.  RF Detector. The RF Detector is comprised of
Board 2A2 processes inputs from Phase and Amplitude
2A1Q8 and its associated components.  When RF Is
Detector 2A4 to provide drive signals for Servo Motor
sensed on the transmission line, a DC signal is present
Control 2A6. Thirteen functions are contained on 2A2.
at 2XA1-B This signal is coupled into the RF detector
These functions are: Phase Preamp, Phase Level
thru an RC network, 2A1R23 and 2A1C34 The RC
Changer, Phase Positive Logic Generator, C1 Home-
network allows 2A1Q8 to trigger on only when a
Flip-Flop, C1 Drive Inhibit, Phase Servo Preamp,
constant DC level is present Erratic levels and spikes
Amplitude Preamp, Amplitude Level Changer, L4 Home
are shunted to ground through 2A1C34. This prevents
Flip-Flop, L4 Force Flip-Flop, L4 Drive Inhibit, Amplitude
noise from turning the antenna tuner off when the
Servo Preamp and Phase/Amplitude Brake.
transmitter is first keyed on when 2A1Q8 triggers on, a
logic 0 is generated at the collector and inverted by
2A1U3. The logic 1 from 2A1U3-3 is fed to the Fault FF
(2A1U4C-10) and the 50 ohm FF (2A1U6B-5).

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