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Page Title: Section III. PRINCIPLES OF OPERATION
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TM 11-5820-882-23/TM 06827A-23/2
Sensitivity- . . . . . . . . . . .
.. .
. .0.5 uV for 10 dB
Frequency stability -------------------------------------- 0.005 percent
Spurious and harmonics radiation--------. ----------50 dB below rf car-
SINAD*
rier level
Squelch sensitivity ---------------------------------------0.5 uV
Modulation limiting ------------------------------------- 15 kHz deviation
Selectivity:  6 dB down------------------------------bandwidth greater
(maximum)
than 15 kHz
Squelch tone (2.5--3.5 kHz deviation) -------------- 148 to 152 Hz
60 dB down------------------------------bandwidth less than
50 kHz
Response to spurious signals -------------------------- 60 dB
RECEIVER
Frequency stability -------------------------------------- 0.005 percent
Audio output ---------------------------------------------less than 10 percent
Adjacent channel rejection ---------------------------- 60 dB
distortion at 20
Image rejection ------------------------------------------- 40 dB
mW
q SINAD =
Signal + Noise + Distortion
Noise + Distortion
Section III. PRINCIPLES OF OPERATION
1-9. General Information
When the radio set is in the transmit mode (unit turned
on and PUSH TO TALK switch depressed), the speaker/
The radio set contains eight plug-in modules which pro-
microphone is used as a microphone to apply a voice
vide all the circuitry necessary for receive and transmit
signal to the modulator/mixer. Here the signal is fre-
operation. These operations can be broken down into
quency modulated on a carrier singal determined by the
two basic functions, described below.
synthesizer and voltage controlled oscillator (controlled
1-10. Receiver Opration (fig. 1-3)
by the frequency select switches). The output of the
When the radio set is turned on (PWR OFF/ON/
modulator/mixer goes to the transmitter module where
SQUELCH DIS switch in the ON position), the unit is
it is amplified to 1 watt minimum. The antenna coupler
in the receive mode (squelch is on, no receiver noise pre-
matches the transmitter circuit impedance to the anten-
sent). Signals entering the antenna are routed through
na (long or short) for maximum power transfer.
the antenna coupler to the converter stage. The frequen-
cy synthesizer and voltage controlled oscillator (vco)
1-12. Secure Voice Operation
provide a mixer frequency for the coverter stage. This
Secure voice operation may be utilized on the radio set
mixer signal is determined by the setting of the frequen-
by connecting the secure voice module (svm) to the bot-
cy select switches (three located on the synthesizer
tom of the rt unit. The battery case and battery must be
module and one located on the top panel of the radio
removed first. The svm connector (located next to the
set). After the incoming signal is converted to a 12.0
battery connector) has a small black shorting plug in-
MHz signal, it is routed to the filter/i-f module for
stalled. This plug must be removed to install the svm in
amplification and a second conversion to 6.5 MHz and
its place. If the radio set is not being used with secure
then to the i-f/a-f module. The intermediate frequency
voice equipment, the shorting plug must be installed in
and audio frequency (i-f/a-f) module detects and
the svm connector for normal set operation. The re-
amplifies the signal and connects it to the built-in
tainer (attached to SVM plug) must be wrapped around
speaker/microphone or external handset.
the connector before installation of plug to prevent
1-11. Transmitter Operation (fig.1-4)
damage to retainer line.
1-2


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