TM 11-5840-281-35/1
4-8. Testing Sum Receiver Channel
(4) Tee Adapter UG-274/U (bnc coaxial)
b. Equipment Condition.
a. Test Equipment Required.
(1) Radar Set AN/TPN-18 turned on,
(1) Multimeter ME-26A/U (vtvm)
aligned, and tuned.
(2) Radar Test Set AN/UPM-56 (radar test
(2) Front and rear covers removed from
set) .
Radar Receiver-Transmitter RT-818/TPN-18.
(3) Oscilloscope AN/USM-140B (oscillo-
scope)
c. Procedure.
Control settings
Step No. Test equipment Equipment under test
Test procedure
Performance standard
a -200 vdc min, -876
a. Connect vtvm COMMON test
Vtvm
Radar Receiver-
1
vdc max.
lead to GRD testpoint TP101
Transmitter RT-818/
on receiver side of Radar Re-
TPN-18 control
ceiver-Transmitter RT-818/
panel
TPN-18 (on fuse panel).
SCAN: OFF
Connect vtvm DC test lead to
HV: OFF
cap of tr tube V101 in Radar
REMOTE-LOCAL:
Receiver-Transmitter RT-818/
REMOTE
TPN-18 (at top left front).
REMOTE POWER:
Observe indication on vtvm.
ON
b. -200 vdc min, -876
b. Remove vtvm DC test lead
Master Pulse
vdc max.
from cap of tr tube V101 and
connect to cap of tr tube V102.
O-1333/TPN-18
Observe vtvm indication.
SCAN MODE:
c. None.
c. Remove vtvm DC test lead
SEARCH
from cap of tr tube V102.
SCAN: OFF
d. None.
d. Disconnect vtvm COMMON
FOCUS: Fully ccw
test lead from GRD testpoint
INTENSITY: Fully ccw
TP101.
POWER: ON
e. 0.6 ma to less than 1.0
e. On Radar Receiver-Transmitter
IF GAIN AZ: Fully cw
ma.
RT-818/TPN-18 control panel,
STC: OFF
adjust LO TUNE control for
FTC: OFF
maximum crystal current a
TRANSMITTER: OFF
indicated on XTAL CUR
LO TUNE: Midposition
meter. Operate XTAL CUR
switch to each of its positions
and observe XTAL CUR
meter. Adjust LO ATTEN for
0.6 ma on lowest XTAL CUR
meter indication.
a. None.
a. Connect oscilloscope CHAN-
NEL A INPUT test prod to
DET VIDEO testpoint TPS01
Oscilloscope As last indicated,
on Intermediate Frequency
except:
Amplifier AM-889/TPN-8
2 POWER: ON
(fig. 8-24).
CHANNEL A VERTICAL
b. None
b. Connect test cable between
POSITION: Midposition
trigger INPUT connector on
Radar Receiver-
HORIZONTAL POSI-
oscilloscope and PRE TRIG-
TION: Midposition Transmitter RT-818/
GER testpoint TP211 on radar
HORIZONTAL DIS- TPN-18 control
transmitter. Use tee adapter
panel
UG-274/U at TP211.
PLAY INTERNAL
XTAL CUR: SUM 1
c. Connect calibrated rf test cable
c. None
SWEEP MAGNIFIER:
(part of radar test set) between
X1
RF POWER connector on radar
HORIZONTAL SWEEP
test met and azimuth directional
EXTERNAL VER-
coupler MPs521 on side of Ra-
NIER: CAL
dar Receiver-Transmitter RT-
SWEEP TIME MICRO-
818/TPN-18.
SECONDS/CM: 2
SWEEP TIME VER-
NIER: CAL
TRIGGER SLOPE: As
required
4-10
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