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 TM 11-6625-564-45
c. Primary power input of the receiver-
P of J2 to relay K2 in the receiver-transmitter
transmitter under test through pins A and B
which energizes it and sets the receiver-trans-
of connector 52.
mitter in the transmit function. SMIT lamp
d. Test point +27.5V jack J12.
DS4 lights.
e. Panel light control, pin P of connector
J6.
1-25. Main Audio
1-23. FUNCTION SELECT Switch S4
The main audio from the receiver-transmit-
ter is applied to pins R and U (U is ground)
FUNCTION SELECT switch S4 on the test
of connector J2. With RF DET switch S1 set
unit control head simulates the action of the
to OFF, the signal is applied to pin E of con-
function select switch of the radio set con-
nector J6 through RF DET switch S1. Con-
trol. It has three functioning positions, T/R,
nector J6 mates with plug P1 of the test unit
T/R + G, and ADF, which are explained in
control head (fig. 4-11). From pin E of plug
detail below:
P1. the signal is applied through AUDIO
a. T/R. When switch S4 is in the T/R pos-
GAIN potentiometer R1 to transformer T1
ition, pin A of connector J6 is grounded. This,
through pins F of connector J6 and plug P1.
in turn, provides a ground through pin T of
The signal is then coupled through trans-
connector J2 for power relay K1 in the re-
former T1 to HDSET H-101A,/U jack J9
ceiver-transmitter so it can be energized and
where it can be heard with a headset. When
distribute +27.5 volts dc internally in the re-
RF DET switch S1 is set to ON, the main
ceiver-transmitter. A path to ground at T/R
audio signal is shunted to ground through re-
lamp DS1 is provided for +27.5 volts dc, and
sistor R3. MAIN AUDIO jacks J7 and J8
T/R lamp DS1 lights.
are provided to connect test equipment for
b. T/R + G. When switch S4. is in the
measurements.
T/R+G position, everything that happened in
1-26. RF Circuit
the T/R position stays the same and the
guard receiver is activated. In the T/R + G
position, pin D of connector J6 is grounded.
The receiver-transmitter rf signal is applied
This condition, in turn, provides a ground
to rf input jack J3. The dummy load or an-
through pin C of connector J2 for guard relay
tenna is connected to ANT jack J4. The rf
K6 in the receiver-transmitter so it can be en-
signal is applied from J3 to RF DET switch
ergized and distribute +27.5 volts dc to the
S1 through a detector and filter network com-
guard receiver section of the receiver-transmit-
posed of diode CR1, resistor R2, inductor
ter. A path to ground at T/R + G lamp DS2 is
L1, and capacitors C1 and C2. RF DET switch
provided for + 27.5 volts dc, and T/R + G lamp
S1 must be in the ON position. After passing
DS1 lights.
through RF DET switch S1, the rf signal fol-
c. ADF. When switch S4 is in + the ADF
lows the identical path that the main audio sig-
position, pin C of connector J6 is grounded.
nal followed (para 1-25d).
This condition provides a path to ground
f o r + 2 7 . 5 - v o l t d c a d f power from the receiver-
1-27. Audio Amplifier 3A1
transmitter through A D F l a m p D S 3 . A D F
lamp DS3 lights.
The microphone (mike) signal from Head-
set H-101A/U is applied to the primary of
1-24. PTT Switch S3
input transformer T1 through HDSET H-101
A/U jack J9. The signal is then coupled
W h e n P T T s w i t c h S3 is set to ON or held
across transformer 3A1T1 through potentio-
to MOM ON,
ground is applied through pin
meter R1 and coupling capacitor Cl to the base
15
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