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Signal Paths of Simulator, Set, Radio
Up
TM-11-6625-564-45 Maintenance Kits Electronic Equipment MK-731/ARC-51X Manual
Next
Simulator, Set, Radio
C2, TM 11-6625-564-45
(6) T h e + 2 7 . 5 V D C l a m p l i g h t s w h e n
T/R, T/R + G, or ADF lamp of the test unit
will light when the FUNCTION SELECT
the POWER switch is set to RESET
ON. This condition indicates that the
switch is in the respective position.
+27.5-volt dc power supply is sup-
c. The transmit circuitry of the receiver-
plying voltage.
transmitter is keyed when the PTT switch on
f. The radio set simulator provides a head-
the  test  unit  is  set  to  MOM  ON  or  OS.  The
set jack and two audio amplifiers to enable
SMIT lamp will light with the switch in either
two-way communication between the techni-
position.
cian in the cockpit and the technician at the
d. W ith the RF DET switch in the OFF pos-
radio set simulator during in-aircraft testing.
ition, the main audio from the receiver-trans-
mitter can be `monitored directly with a head-
Volume may be varied with the AUDIO GAIN
control.
set plugged into the HDSET H-101A U jack.
When the RF DET switch is in the ON posi-
1-5. Signal Paths of Test Set, Radio
tion, the receiver-transmitter transmits into
TS-1962/ARC-51X
jack J3 of the test unit. The signal is detected
and applied to the HDSET H-101A U jack
where the audio can be monitored by a head-
a. When. Test Set, Radio TS-1962/ARC-
set. The AUDIO GAIN control varies the
51X is used as a signal source for testing the
volume of the audio applied to the headset.
receiver-transmitter, test signals are coupled
c. The test unit contains an audio ampli-
through interconnecting cables to the unit be-
fier that amplifies the headset microphone
ing tested. The output of the unit being
output. This amplified output is applied to
tested is returned through the interconnect-
the modulator and audio module A4 in the re-
ing cables to the test unit. for monitoring. Vari-
ceiver-transmitter.
ous other test equipment may be intercon-
f. The test unit control head contains the
nected also, depending on the test being per-
FUNCTION SELECT switch and the AU-
formed. The front panel provides test jacks,
DIO GAIN control previously described. It
indicators, frequency select switches, and a
also contains FRIEQ SELECT switches and a
function select switch.
SENSITIVITY control. The FREQ SELECT
switches select the operating frequency on the
b. Power is supplied to the test unit from
receiver-transmitter,  and  the  SENSITVITY
the bench through the PWR jack and the
control varies the receiver senitivity.  When
POWER switch and circuit breaker. When
the SENSITIVITY control is turned to the ex-
the FUNCTION SELECT switch is turned to
treme clockwise position, marked SQ DIS. the
an operating position (either T/R, T/R+G,
squelch
function
of
the
receiver-transmitter
is
or ADF), power is applied to the receiver-
disabled.
transmitter for the respective function. The
Section II. BLOCK DIAGRAM ANALYSIS
T/R+G.  or  ADF,  relay  K2  is  energized,  and
1-6. Simulator, Set, Radio
the  input  voltage  is  applied  to  relay  K1.  to
transient  blanker  module  1A.1.  and  to  TEST
(fig. 4-6 and 4-6.1)
SELECT switch S1. When the radio set con-
POWER
When the
a. Primary Power.
trol function select switch is set to T `R.
switch is set to RESET ON, +27.5 VCDC lamp
T/R  lamp  DS1  will  light  to  indicate  that  the
receiver-transmitter has +27.5 volts dc with
DS5  lights,  and  +  27.5  volts  dc  is  applied  to
which to operate; when the
switch is set to the
frequency readout mechanism 1A6, relay K2.
T/R + G position. T/R + G lamp DS2 will light
and SMIT LOAD switch S4. When the func-
to indicate that current is flowing through
tion select switch of the radio set control (not
T/R + G lamp DS2, relay K1, and to the guard
shown in figure 4-6) is set either to T/R,
5

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