TM 11 -5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
a.
a.
10 ------------------------------
As last indicated, except:
On master Control-Indicator
AZ TILT meter indicates
Master control-Indicator
C-6988/TPN-18, place
0 deg on Control-
C-6988/TPN-18 and
ANTENNA switch to U or
Indicator C-6988/TPN-
D as required to obtain 0-deg
18 under test.
Pulse Generator
indication on AZ TILT meter.
O-1333//TPN-
b.
b.
Rotate IF GAIN-AZ control
Radar returns on Control-
18
cw to obtain radar return on
Indicator C-6988/
TRANSMITTER:
crt that is below limit level.
TPN-18 under test.
Through WIDE to
c.
c.
Peak receiver tuning by ad-
LO TUNE control has
HV ON
justing LO TUNE control
adequate tuning control.
HV ON indicator:
for max amplitude of radar
Lighted
return obtained in b above.
SCAN: OFF
Maintain radar return below
VIDEO GAIN: Fully cw
limit level by rotating IF
FTC: OFF
GAIN-AZ control ccw while
Pulse Generator
adjusting LO TUNE control.
O-1333/TPN-I 8
under test
RANGE MILES:
a.
a.
On master Control-Indicator
Receiver noise for 40 mi
10
C-6988/TPN-18, rotate IF
on Control-Indicator
GAIN-AZ fully cw.
C-6988/TPN-18 under
11 ------------------------------
As last indicated, except:
test. No ftc or stc action.
Master Pulse Generator
b.
b.
Adjust IF GAIN-AZ control
Receiver noise just
O-1333/TPN-18
for normal operating level.
visible on Control-
SCAN: ON
Indicator C-6988/TPN-
Pulse Generator
18 under test.
0-1333/TPN-18
c.
c.
If installed at operational site,
Indicated bearing of
under test
observe radar return of known
known radar return is cor-
RANGE MILES:
bearing on Control-Indicator
rect on Control-Indicator
40
C-6988/TPN-18 under test.
C-6988/TPN-18 under
Position navigation head
test.
center gridline through radar
return. Note bearing indicated
by center gridline at compass
rose ring.
a.
a.
On master Control-Indicator
HV ON indicator re-
C-6988/TPN-18, place
mains lighted and
TRANSMITTER switch
apparent width of radar
12 ------------------------------
As last indicated-----------
through NARROW to HV
returns decrease on
ON.
Control-Indicator
C-6988/TPN-18 under
test.
b.
b.
Place TRANSMITTER switch
HV ON indicator remains
through WIDE to HV ON.
lighted and apparent
width of radar returns in-
crease on Control-Indi-
cator C-6988/TPN-18
under test.
c.
Place STC switch to ON -----
c.
Receiver noise and radar
returns at close-in range
decrease on Control-Indi-
cator C-6988/TPN-18
under test.
d.
Place STC switch to OFF ----
d.
Receiver noise and radar
returns at close-in range
increase on Control-Indi-
cator C-6988/TPN-18
under test.
4-38
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