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TM
11-5820-919-40-1
SECTION
II
OVERALL
FUNCTIONAL
DESCRIPTION
.
GENERAL
Mode  Selection.
The  MODE  switch
selects  either  voice  transmit  (V-TR),
voice  receive  (V-RCV),  data  transmit
RADIO  SET.
The radio set con-
(D-TR),  or  data  receive  (D-RCV).  The
sists of  three  major  assemblies:
Mode Select signals are used by the
modulator/demodulator  to  control  the
Receiver/exciter
(A1)
1.
processing  of  the  transmit/receive  radio
frequency  (Xmt/Rcv  RF).  In  the  voice
Amplifier/coupler
(A2)
2.
mode, the  microphone  input  impedance  is
150 ohms and the VOLUME control adjusts
Battery
pack
3.
the level of the Rcv Audio.
In the data
mode,  the  input  impedance  is  changed  to
The  receiver/exciter  contains  five  mod-
600  ohms,  which  is  compatible  with  stan-
ules:
(1)  control  panel,  (2)  synthe-
dard  data  systems.
The  VOLUME  control
sizer,  (3)  modulator/demodulator,  (4)
is also disabled so that a constant
harmonic  filter,  and  (5)  the  power
receive  level  is  maintained.
In addi-
supply.  The  amplifier/coupler  contains
tion, the  receiver  agc  release  time
the  power  amplifier  and  antenna  tuner
constant  is  shortened  to  reduce  the
modules.
The  battery  pack  provides  the
receive  response  time  to  incoming  data.
radio set with the +28v (nominal) dc
power.
The SB
Sideband
Selection.
switch  selects  either  upper  sideband
RECEIVER/EXCITER
(USB) or lower sideband (LSB) of the
radio
frequency.
The  Sideband  Select
The  control  panel
CONTROL  PANEL.
signals  are  sent  to  the  synthesizer.
provides  operational  control  of  the
The synthesizer sends either 70 MHz to
radio  set  and  couples  transmit/receive
the  modulator/demodulator  if  USB  is
audio  signals  between  the  audio  devices
selected or 80 MHz if LSB is selected.
in use by the operator and the radio set.
The  control  panel  contains  the  FREQUENCY
The  VOLUME  con-
Volume  Control.
KHZ  (frequency  select)  switches,  MODE
trol is used to control the Rcv Audio
select  switch,  SB  (sideband)  select
level  from  the  modulator/demodulator.
switch,  VOLUME  control,  LIGHT  switch,
and  audio  connectors.
SYNTHESIZER.
The  synthesizer
generates the 5 MHz, 70 (USB) or 80
Frequency
Selection.
The  FRE-
(LSB) MHz, and 77105 MHz LO signals.
QUENCY  KHZ  switches  select  the  operating
The exact frequency of the 77105 MHz
frequency of the radio set (2,000 thru
LO is 75 MHz plus the control panel
29,999  kHz).
The  frequency  select
frequency.
The LO signals are used by
switches  send  Frequency  Select  signals
the  modulator/demodulator  in  the  proc-
(logic  data)  to  the  synthesizer  for  use
essing  of  transmit/receive  signals.
in  determining  the  frequency  of  the
The  synthesizer  also  generates  a  1-kHz
77-105  MHz  LO  signal.  The  Frequency
tone which is used by the modulator/
Select signals are also used by the
demodulator to develop a cw key tone.
antenna  tuner  during  impedance  matching.
The Filter Select signal from the fre-
MODULATOR/DEMODULATOR.
In  trans-
quency select switches is used by the
mit  operation  the  modulator/demodulator
harmonic  filter  to  select  the  bandpass
converts  the  Xmt  Audio  into  two  succes-
filter  corresponding  to  the  selected
sive  intermediate  frequencies  and  then
frequency.


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