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Figure 1-2. Typical Warranty Notice. - TM-11-5820-873-340008
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TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
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Figure 2-1. Radio Receiver-Transmitter Simplified Block Diagram.


TM 11-5820-873-34
CHAPTER 2
FUNCTIONING OF EQUIPMENT
Section I. GENERAL
NOTE
2-1.  Introduction.
Although
COUPLER
This chapter describes how the radio set operates. The
CONTROL 1A2 is housed in the radio
chapter is divided into four sections which present the
set, it functions as part of the CU-
information in a logical sequence.
2229/URC-92.  Certain functioning with
meter 1A2M1 will be discussed in this
2-2.  Description of Sections.
section but the remainder of ANTENNA
a. Functional  Operation  of  Radio  Receiver-
COUPLER CONTROL 1A2 functions will
Transmitter RT-1277/URC-92. Section II describes the
be covered in Section III.
functional operation of the RT-1277/URC-92.
The
section progresses from a simplified system explanation
b. Functional Operation of Antenna Coupler CU-
and block diagram to detailed circuit descriptions and
2229/URC-92.
Section III describes the functional
block diagrams.
This presentation enables easy
operation CU-2229/URC-92.
identification of circuitry common in both receive and
c.  Functional Operation of Circuits.  Section IV
transmit functions and that circuitry specific to either
describes the functional operation of non-conventional
receive or transmit.
circuits  and  certain  conventional  circuits.
The
conventional circuits discussed in this section are those
circuits that perform functions that may not be readily
apparent to an experienced maintenance technician.
Section II. RADIO RECEIVER-TRANSMITTER RT-1277/URC-92 FUNCTIONAL OPERATION
sidetone to be generated in receiver/exciter 1A3. The
2-3.  Simplified Overall Operation (Fig. 2-1).
sidetone is coupled through speaker driver 1A1A1 to
a. Operating Frequency.
The RT-1227/URC-92
speaker 1A1LS1.  The receiver/exciter also uses the
operates over a frequency range of 1.6 to 29 9999 MHz.
sidetone to modulate the signals from the synthesizer.
The operating frequency is determined by the setting of
The RF output from the receiver/exciter is amplified by
FREQ CONTROL 1A1S15 and the FREQUENCY A and
RF power amplifier 1A7. The output from the RF power
FREQUENCY B front panel switches.
amplifier is passed through filter 1A5 to ANT jack
(1)  FREQ CONTROL 1A1S15 selects which
1A8J1.
group of FREQUENCY switches that control the
(2)  Voice Audio from the handset is coupled into
operating frequency
receiver/exciter 1A3.  The receiver/exciter uses the
(2)  The setting of the selected FREQUENCY
audio to modulate the signals from the synthesizer. The
switches is decoded by decoder 1A1A2 and displayed
RF output from the receiver/exciter is amplified by RF
by LED display 1A1A3.
power amplifier 1A7.  The output from the RF power
(3)  Synthesizer 1A4 has three output frequencies.
amplifier is passed through filter 1A5 to ANT jack
Two of the output frequencies are fixed and the third
1A8J1.
controls the operating frequency of the RT-1277/URC-
92.
b. Receive Operation. The RF signal is received at
2-4.  Receiver Functional Operation (Fig. FO-1).
ANT jack 1A8J1 and passed through filter 1A5 to
a. Overall Functional Operation.  Incoming RF is
receiver/exciter 1A3. The receiver/exciter converts the
filtered by the selected bandpass filters in filter module
RF signal to audio. The audio signal is amplified by
1A5 (para 2-10). The output of the bandpass filters is a
speaker driver 1A1A1 and used to drive speaker
narrow segment of the RF spectrum that includes the
1A1LS1.
frequency selected by the FREQUENCY switches. The
c.  Transmit Operation.
output from the filter module is coupled into VHF mixer
(1)  CW.
Operating the CW Key causes a
1A3A1 where it is fed through a high pass filter. The
signal is then amplified and mixed with the 1st local
2-1


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