4-9. Test Set, Mixer Assembly A1A5, Tests
a. Test Equipment and Materials.
(1) Generator, Signal AN/GRM-5D.
(2) Voltmeter, Electronic AN/URM-145.
(3) Four UG-1460/U connectors.
(4) Tee Connect UG-274B/U.
(5) Two Sealectro 5051 BNC connectors.
(6) Twelve index of RG-196/U coaxial cable.
(7) Two fixed resistors, 51 ohms, 1/2 watt each.
(8) Two clips, electrical (alligator clips).
b. Test Connections and Conditions. Connect the test equipment, as shown in Figure 6-19, to mixer assembly A1A5 (Fig. 4-5). Fabricate the two 51-ohm
test leads (Fig. 6-19), and connect as directed in the procedure (c below).
c. Procedure.
Step
Control settings
No.
Test equipment
Equipment under test
Test procedure
Performance standard
1
AN/GRM-50
SM-442A/GRC
RANGE switch:
POWER switch: OFF
a. Connect the 51-ohm fabricated a. None.
530KC-1800KC
SERV SEL switch: STBY
FREQUENCY control:
PA/RT switch: PA
19) to A1A5J2 and to
1750.00KC
KEY switch: OFF
A1A5J4 on mixer assembly
MODULATION SE-
XMIT STATUS switch: OPR
A1A5 (fig. 3-10).
LECTOR: CW
REC-XMIT switch: REC
b. Connect one end of cable
b. None.
AN/URM-145
ALC VOLTAGE INFO con-
W1 to the Tee Connector
VOLTS switch: .3
trol: Fully counterclockwise
UG-274B/U on the AN/
Power switch: ON
ALC VOLTAGE TUNE con-
GRM-50 to TWO TONE IN
trol: Fully counterclockwise
connector A1A5J1.
IF OSCILLATOR SELECT
c. Set A1A5R1 fully clockwise
c. None.
switch: 1
and turn the PP-1451/G
IF OSCILLATORS 1, 2, and 3
power switch and the SM-
output level controls: Fully
442A/GRC POWER switch
counterclockwise
to ON.
MC FREQ 10MC switch: 0
d. With the AN/URM-145 con-
d. None
MC FREQ 1MC switch: 0
nected to the remaining end
MC FREQ .1MC ditch: 0
of the tee connector, adjust
500 VDC LOAD switch: LOW
the AN/GRM-50 to 1.75
2400 VDC LOAD switch: 1
mc at 150 mv.
e. Connect the AN/URM-145 to
e. Not less than 0.075 mv.
the TWO TONE OUT
connector, and record the
output level.
2
Same as step 1 above.
Same as step 1 above.
a. Connect the AN/GRM-50
a. None.
to A1A5J4. Connect the
AN/URM-145 to the tee
connector on the AN/GRM-
50, and check to see that
the output is 150 mv.
b. Connect one end of cable
b. None.
W1 to the tee connector
on the AN/GRM-50 to
TWO TONE IN connector
A1A5J1.
c. Connect one of the 51-ohm
c. None.
fabricated test leads to
A1A5J3, and set A1A5R1
fully counterclockwise.
d. Connect the AN/URM-145
d. Less than 1-mv output.
to A1A5J5, and measure
the output (use 0.003
range).
e. Set A1A5R1 fully clockwise......... e. More than 10-mv output.
f. Remove the 51-ohm test load
f. None
from A1A5J3, connect it
to A1A5J4, and set A1A5R1
fully counterclockwise.
g. Feed the 150-mv signal into
g. Less than 1-mv output.
A1A5J1.
h. Set A1A5R1 fully clockwise......... h. More than 10-mv output.
i. Turn the power switches to
OFF.
4-13
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