TM 11-6625-847-45
J25; with the switch in the REC position, pin 24 receives
two-tone signal from either the internal IF oscillator
+ 20-volt dc and pin 2 is grounded.
modules, 1.7515 MC and 1.7525 MC, or an external
two-tone signal generator source, depending on the
position of AGC SYNC switch S6. When in the ON
b. Test point AUDIO OUT measures thus audio
position, the KEY switch on the test set supplies +20-
output signal at pin 19 of connector J25 across the 100-
volt dc through pin 98 of connector J1 to ALC APC PPC
ohm load of resistor R8. INPUTS test points 50 a
CONTROL-POWER CONTROL resistor R6. The output
AUDIO and 1 KC PULSE connect external test
of the ALC APC PPC CONTROL-POWER CONTROL
equipment to the transmitter IF and audio module. The
resistor is selected by ALC APC PPC CONTROL-
IF output frequency of the transmitter IF and audio
APC/PPC SEL switch S9, to pin 7 of connector J25 in
module at pin Al of connector J25 is measured across
the APC position, and to pin 8 of connector J25 in the
the 51-ohm load of resistor R2 at COMMON test point
PPC position. When in the ON position, ALC APC PPC
IF OUT.
CONTROL-ALC switch S10 connects the output voltage
of the ALC APC PPC CONTROL-POWER CONTROL
resistor R6 to pin 6 of connector J25.
1-18. VOICE MODES Switch S8
a. VOICE MODES switch S8 controls the ground
1-17. TEST SELECTOR Switch S7
to pin 29 and 27 of transmitter IF and audio module
connector J25. In the PUSH TO TALK position, a
a. TEST SELECTOR switch S7 controls the
ground is supplied to pin 27 of J25 and supplies a
selection of the XMTR IF AND AUDIO test points HI and
ground to pin 99 of connector J1. The ground at pin 99
LO for voltage measurements at the connector pins on
is connected through the VOICE MODES switch in the
the transmitter IF and audio module when connected to
PUSH TO TALK position, contacts 6 and 8 of pin 75,
JS as follows: position 1 connects to the +20-volt dc
connector J1. The ground is then coupled through the
input to connector J8 at pin 1; position 2 measures the
SSB/NSK or AM positions of the SERV SEL switch on
ALC meter output voltage at pin 4 of J8; position 3
the test set to pin 76 of connector J1 and to pin 29 of
monitors the voltage level of ALC APC PPC CONTROL-
J25. In the PUSH TO VOX position of S8, pin 27 of
POWER CONTROL resistor R6; with a shorting bar
connector J25 is grounded as follows. The ON position
connected across the XMTR IF AND AUDIO test points
of the KEY switch on the test set supplies a ground to
HI and LO, position 4 of the TEST SELECTOR switch
pin 99 of connector J1. Pin 99 is jumped to pin 86 on
supplies + 27-volt dc to KEYLINE test point RT and to
connector J1 by tray A1A2, and the ground at pin 86 is
pin 31 of J25; with a shorting bar connected across the
then connected to the SERV SEL switch on the t set.
XMTR rF AND AUDIO test points HI and LO, position 5
The SERV SEL switch, in positions SSB/ NSK or AM,
of the TEST SELECTOR switch supplies +27-volt dc to
connects the ground to pin 79 of J1 through contacts 5
KEYLINE test point PA and to pin 32 of connector J25.
and 3 of the VOICE MODES switch. In the PUSH TO
In the CW position, the SERV SEL switch on the test set
VOX position of the VOICE MODES switch, connection
supplies a ground on pin 14 of J25, +20-volt dc to pin 13
is made to pin 27 of J25; in the VOX position, pin 27 of
of J25 and a ground to pin 30 of J25 with the HEY
connector J25 is grounded as follows. In the SSB/NSK
switch at ON. A ground is supplied to pin 22 in either
or AM positions, the SERV SEL switch on the test set
the CW or FSK positions of the SERV SEL switch. In
supplies a ground to pin 87 of connector J1, and pin 87
the AM position, the SERV SEL switch supplies a
of J1 is connected through contacts 9 and 3 of the
ground to pin 9 of connector J25. In the XMIT position,
VOICE MODES switch; in the VOX position of the
the REC XMIT switch on the test set supplies a 1-16
VOICE MODES switch, connection is made to pin 27 of
ground to pin 24 and + 20-volt dc to pin 2 of connector
connector J25.
1-16
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