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Table 2-1. Synthesizer Programmed Frequencies.
Up
TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
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19 MHz Balanced Mixer.


TM 11-5820-873-34
has not gone low. With the exception of the input that is
1A4A2U7, divide-by-10 counter 1A4A2U8 will assume a
connected to pulse generator 1A4A2U7, all of the inputs
count of one instead of the preset count, since a data
to count filled detector 1A4A2U3 are high. On the next
strobe pulse was not received from preset generator
output pulse from pulse generator 1A4A2U7, the count
1A4A2U4. Divide-by-10 counter 1A4A2U8 will have an
will be 1877 (the preset count) When the output from
output at pin 12 after every 10 input pulses until preset
1A4A2U7 goes high, it will put a high on the only input to
by the next data strobe pulse ((c) below).
1A4A2U3 that is low and 1A4A2U3 will output a 50
(c)  Divide-by-10 counter 1A4A2U9 has been
nanosecond pulse.  On the trailing edge of the pulse
preset to a count of two ((a) above). The outputs at pins
from 1A4A2U3 preset generator 1A4A2U4 will output a
5 and 12 are low. As described in ((b) above), 1A4A2U8
75 nanosecond pulse.  The output from 1A4A2U4 is
will have 7 outputs after 67 inputs from 1A4A2U7. After
coupled to phase detector 1A4A2U2 ((4) below) and to
seven outputs from 1A4A2U8, the count in 1A4A2U9 will
the data strobe inputs of the preset counter
be nine (preset of two, plus seven counts). At the count
(4)  Phase Detector and Loop Filter.
Phase
of nine, the output at pin 12 will be high because of the
detector 1A4A2U2 compares the output frequency of the
nine count and the output at pin 5 will be high because
preset counter ((3) above) with the 1 kHz reference
the count is an odd number. On the trailing edge of the
signal from spectrum generator 1A4A1 (a above) and
next input pulse to 1A4A2U9 (77 inputs to 1A4A2U8),
develops a DC output voltage that is proportional to the
the outputs at pins 5 and 12 will both go low. When pin
two signals. The output of the preset counter will be 1
12 goes low, 1A4A2U10 will advance one count. On the
kHz when the VCO is operating at the desired frequency
trailing edge of the next input pulse (87 inputs to
If the output of the VCO is high, the output frequency of
1A4A2U8), 1A4A2U9 will assume a count of one instead
the preset counter will be less than 1 kHz. The output
of the preset count, since a data strobe pulse was not
voltage from the phase detector will decrease, causing
received from preset generator 1A4A2U4. Divide-by-10
the operating frequency of the VCO to decrease. If the
counter 1A4A2U9 will have an output at pin 12 after
output of the VCO is low, the output frequency of the
every 10 input pulses (100 inputs to 1A4A2U8) until
preset counter will be more than 1 kHz.  The output
preset by the next data strobe pulse ((e) below).
voltage from the phase detector will increase, causing
(d)  Divide-by-10 counter 1A4A2U10 has been
the operating frequency of the VCO to increase. The
preset to a count of one ((a) above). The output at pin 5
loop filter removes any 1 kHz components in the phase
is high and the output at pin 12 is low. As described m
detector output and also determines the transient
((b) and (c) above), 1A4A2U9 will have 8 outputs after
response of the loop.
777 inputs to 1A4A2U8.  After eight outputs from
(5)  Output Divider.
The output from buffer
1A4A2U9, the count in 1A4A2U10 will be nine (preset at
1A4A2U1 ((1) above) is amplified by driver 1A4A2Q5.
one, plus eight counts). At the count of nine, the output
Divide-by-10 counter 1A4A2U5 divides the signal from
at pin 12 will be high because of the nine count and the
1A4A2Q5 and the 1.50 to 1.5999 MHz output signal is
output at pin 5 will be high because the count is an odd
fed through the 1 55 MHz bandpass filter and emitter
number. On the trailing edge of the next input pulse to
follower 1A4A2Q6 to translator 1A4A3 ((c) below).
1A4A2U10 (877 inputs to 1A4A2U8), the outputs at pins
c.  Translator 1A4A3 (Fig. FO-3 and FO-20)
5 and 12 will both go low.  When pin 12 goes low,
(1)  Voltage Controlled Crystal Oscillator.  With
1A4A2Ull will advance one count. On the trailing edge
the VFO control pulled out (on), + 12 volts is applied to
of the next input pulse (977 inputs to 1A4A2U8),
21 MHz reference amplifier 1A4A3U1 disabling the
1A4A2U10 will assume a count of one instead of the
amplifier. The same + 12 volts turns voltage controlled
preset count, since a data strobe pulse was not received
crystal oscillator 1A4A3Q1 and switch 1A4A3Q3.
from preset generator 1A4A2U4. Divide-by-10 counter
Turning on 1A4A3Q3 enables amplifier 1A4A3U2.
1A4A2U10 will go high at pin 12 after the next nine input
1A4A3Q1 is a crystal controlled Colpitts oscillator
pulses (900 inputs to 1A4A2U8).
operating In the frequency range of 20.995 to 21 005
(e)  The output from divide-by-two counter
MHz.  The control voltage from the VFO control is
1A4A2Ull is high because the output from 1A4A2U10
applied through control amplifier 1A4A3Q3 to the
went low after 877 inputs to 1A4A2U8 ((d) above). After
varactor diodes in the circuit to control the operating
999 more inputs to 1A4A2U8 the count will be 1876. All
frequency of 1A4A3Q1. The output from 1A4A3Q1 is
of the divide-by-10 counters will have a count of 9. The
amplified by 1A4A3U2 and applied to the 19 MHz
outputs at pin 5 will be high because the count is an odd
balanced mixer ((3) below).
number and the outputs at pin 12 will be high because of
(2)  21 MHz Reference Amplifier. With the VFO
the nine count. The output from divide-by-two counter
control pushed in (off), 1A4A3Q1 and 1A4A3U2 are
1A4A2U11 is still high because the output of 1A4A2U10
2-12


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