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Page Title:
Section III. STAGE ANALYSIS OF SIMULATOR, SET, RADIO |
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 C2,TM 11-6625-564-45
Section III. STAGE ANALYSIS OF SIMULATOR,
SET, RADIO
1-8. General
the parallel combination of relay K1 and
XMIT lamp DS3. The push-to-talk switch on
This section describes the principles of oper-
the microphone associated with the radio set
ation of the radio set simulator, and includes a
control, when depressed, provides a path to
stage analysis of the various circuits to assist
ground for the +27.5 volts dc through the
t h e r e p a i r m a n while troubleshooting
the
same parallel combination mentioned above to
equipment.
pin P of connector J2. Relay K1 is ener-
gized, and XMIT lamp DS3 lights if either
1-9. Primary Power Distribution
the test unit PTT switch or the microphone
push-to-talk switch is depressed. Whenever
relay K1 is energized, the radio set simulator
a. The +27.5 volts dc voltage from the air-
is placed in a simulated transmit condition.
craft power source is applied to pins A and
B of connector J2. From connector J2, the
1-11. XMIT LOAD Switch
power is directly applied through meter multi-
plier resistor R9 to terminal 3 of TEST SE-
(fig. 4-8)
LECT switch S1B. When POWER circuit CB1
XMIT LOAD switch S4 should
Caution:
is placed in RESET ON, +27.5 volts dc is ap-
only he set to ON momentarily.
Transmit
plied to the following circuits in the radio set
load conditions are simulated when XMIT
simulator:
LOAD switch S4 is set to ON. This setting
(1) Terminal No. 1 on frequency read-
applies +27.5 volts dc through thermostat S5
out mechanism module 1A6.
across load resistor R19 to XMIT LOAD lamp
(2) XMIT LOAD switch S4.
DS4. Relay K1 is energized, XMIT LOAD
(3) Terminals 4 and 5 on relay K2.
lamp DS4 lights, and XMIT lamp DS3 lights.
(4) Plus 27.5 VDC lamp DS5. Lamp
DS5 lights.
b. The radio set control function select
1-12. Guard Receiver
switch must be in one of the three on-positions
(T/R', T/R + G, ADF) in order for relay K2
When the radio set control function select
to be energized and complete distribution of
switch is set to T/R+G, a ground is provided
the +27.5 volts dc. When the radio set control
at pin C of connector J2. This condition pro-
is turned on, a path to ground is supplied to
vides a path for the +27.5 volts dc through
terminal 1 of relay K2 through pin T of con-
T/R+G lamp DS2 and relay K1 (at pins 13
nector J2. Relay K2 is energized in this
and 2) to the radio set control through pin C
manner, and the +27.5 volts dc is now applied
of connector J2. T/R+G lamp DS2 lights.
to four indicator lamps, DS1, DS2, DS3, and
DS6; pin c of connector J2; terminal 1 of relay
K1; input terminal El of transient blanker
1-13. Squelch Disable
module 1A4; terminals 2, 6, and 7 of., TEST
SELECT switch S1B; and through resistors
R8, R6, and R5 respectively.
When the sensitivity control on the radio set
control is turned to the extreme clockwise pos-
ition (SQ DIS), a path to ground is provided
1-10. PTT Switches
through SQ. DIS lamp DS6 to the radio set
control through pin a of connector J2 for pri-
PTT switch S2, when depressed, provides a
mary power of +27.5 volts dc. SQ. DIS lamp
path to ground for the +27.5 volts dc through
DS6 lights.
8
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