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Transmitter Functional Operation (cont)
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TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
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CPLR TUNE KW Functional Operation (cont)


TM 11-5820-873-34
coupled through the selected low pass filter (para 2-10)
signal from the selected filter when mode switch
to ANT jack 1A8J1.
1A1S13 is set to LSB, USB or CW The output from the
(18) Current ALC detector 1A7A17 monitors the
amplifier is coupled to 2nd balanced mixer 1A3A1CR9
supply current to the RF power amplifier.  When the
thru 1A3A1CR12.
supply current exceeds 10 amperes, 1A7A1Q7 is turned
(12) When mode switch 1A1S13 is set to AM,
on causing current ALC amplifier 1A3A1Q4 to reduce
amplifier 1A3A2Q1, 1A3A2Q2 combines the upper
the gain of amplifier 1A3A1Q1l, 1A3A1Q3.
sideband signal with the 10.5 MHz carrier signal and
(19) ALC amplifier 1A3A3Q9, 1A3A3Q10 limits the
amplifies the combined signal ((11) above).
gain of amplifier 1A3A2Q1, 1A3A2Q2 when the VSWR
(a)  The AM/CPLR TUNE KW transmit enable
is too high or the RF output voltage is too high.
signal is coupled from mode switch 1A1S13 through
(a)  VSWR ALC detector 1A7A1CR4 causes the
relay 1A8K1 to turn on AM transmit switch 1A3A3Q13.
ALC amplifier to limit the gain of amplifier 1A3A2Q1,
The AM transmit switch enables automatic carrier
1A3A2Q2 when the peak voltage on the collector of
control (ACC) amplifier 1A3A3Q2, 1A3A3Q3, 1A3A3Q5.
1A7A1Q6 is too high.
(b)  The gain of the automatic carrier control
(b)  Reflected  power  detector  1A5A4CR16
amplifier is controlled by the detected carrier signal from
causes the ALC amplifier to limit the gain of amplifier
ACC detector 1A5A4CR6, 1A5A4CR12 ((20) below).
1A3A2Q1, 1A3A2Q2 when the VSWR on the RF output
The automatic carrier control amplifier amplifies the
line is too high.
10.5 MHz 3rd local oscillator signal. The amplified 3rd
(c)  Voltage ALC detector 1A5A4Q2, 1A5A4Q3
local oscillator signal is injected into amplifier 1A3A2Q1,
causes the ALC amplifier to limit the gain of amplifier
1A3A2Q2 where it is combined with the upper sideband
1A3A2Q1, 1A3A2Q2 when the RF output voltage is too
signal.
high.
(13) The nominal 80.75 MHz 2nd local oscillator
(20) ACC  detector  1A5A4CR6,  1A5A4CR12
signal from synthesizer 1A4 is coupled to the 2nd
reduces the gain of automatic carrier control amplifier
balanced mixer through 2nd local oscillator amplifier
1A3A3Q2, 1A3A3Q3, 1A3A3Q5. At initial turn on in AM
1A3A1Q8. The output from the 2nd balanced mixer is
transmit mode, automatic carrier control amplifier
coupled to amplifier 1A3A1Q7.
1A3A3Q2,  1A3A3Q3,  1A3A3Q5  is  operating  at
(14) Amplifier 1A3A1Q7 is enabled by the transmit
maximum gain ACC detector 1A5A4CR6, 1A5A4CR12
enable signal and amplifies the output from the 2nd
detects the level of carrier signal on the RF output line
balanced mixer.  The 91.25 MHz (sum frequency)
and reduces the gain of the automatic carrier control
output signal from lA3A1Q7 is coupled through VHF
amplifier to establish the desired carrier signal level.
filter 1A3A1FL1 to 1st balanced mixer 1A3A1CR4 thru
(21) Power output detector 1A5A4CR5 samples
1A3A1CR7.
the voltage on the RF output line.  The output from
(15) The 91.25 MHz to 121.2499 MHz 1st local
1A5A4CR5 drives meter 1A2M1 when FWD power is
oscillator signal from synthesizer 1A4 is coupled to the
selected by 1A2S1.
1st balanced mixer through 1st local oscillator amplifier
1A3A1Q5.  The nominal frequency of the 1st local
oscillator signal is 91.25 MHz plus the setting of the
2-6.
CPLR TUNE KW Functional Operation
selected FREQUENCY switches.
If the selected
(Fig. FO-2)
FREQUENCY switches are set to 12.3456, the 1st local
oscillator frequency is 103.5956 MHz. The output of the
With mode switch 1A1S13 in CPLR TUNE KW, pressing
1st balanced mixer is coupled to amplifier 1A3A1Q1,
TUNE START switch 1A2S2 places the RT-1277/URC-
1A3A1Q3.
92 in the transmit mode. Relays 1A5A4K2 and 1A8K1
(16) The gain of amplifier 1A3A1Q1, 1A3A1Q3 is
are energized through the SU-2229/URC-92.
controlled by the output of current ALC amplifier
a. Overall Functional Operation. The 10.5 MHz, 3rd
1A3A1Q4 ((18) below). The current ALC amplifier limits
local oscillator signal from synthesizer 1A4 is amplified
the gain of 1A3A1Q1, 1A3A1Q3 during high current
and mixed with the 80.75 MHz, 2nd local oscillator
peaks. Amplifier 1A3A1Q1, 1A3A1Q3 is enabled by the
signal from synthesizer 1A4. The resultant signals are
transmit enable signal and amplifies the difference
amplified and passed through a 91.25 MHz (sum
frequency (equal to the setting of the selected
frequency) filter. The 91.25 MHz signal is mixed with
FREQUENCY switches) output of the 1st balanced
the 91.25 to 121.2499 MHz, 1st local oscillator signal
mixer.
from synthesizer 1A4.  The difference frequency (1st
(17) RF power amplifier 1A7A1Q11 thru 1A7A1Q6
local oscillator frequency minus 91.25 MHz) is amplified
is enabled by the transmit enable signal and amplifies
to the 30-40 watt level and passed through a low pass
the HF signal from 1A3A1Q1, 1A3A1Q3 to the 100 watt
filter to ANT jack 1A8J1.
level.  The output from the RF power amplifier is
b. Detailed Functional Operation.
2-6


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