TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
b.
None.
b.
observe that horizontal trace is
about 1 in. from bottom of crt.
c.
None.
c.
Rotate MIXER AMPLIFIER
control and SPECTRUM WIDTH
control to fully cw.
d.
None.
d.
Adjust SPECTRUM CENTER
control until oscilla tor hump
appears centered on crt as
shown in fig. 5-27A. (Two
oscillator humps are possible.
Either may be used.)
e.
None.
e.
Adjust MIXER AMPLIFIER
control until oscillator hump is
approximately 2 in. high.
a.
None.
a.
On spectrum analyzer, rotate
4
As last indicated ..........
As last indicated ............
FREQUENCY control until
frequency pip is centered on
oscillator hump as shown in fig.
b.
None.
b.
Note frequency indicated on
FREQUENCY control dial. If
indicated frequency is other than
approximate operating frequency
of magnetron, perform c and d.
below; otherwise proceed to
step 5 below.
c.
None.
c.
Set FREQUENCY control to
operating frequency of
magnetron.
d.
None.
d.
Adjust OSCILLATOR
FREQUENCY control until
frequency pip appears in center
of oscillator hump as shown in
fig. 5-27B. Simultaneously
adjust SPECTRUM CENTER
control to maintain oscillator
hump centered on crt.
a.
None.
a.
Adjust SPECTRUM AMPLITUDE
5
Spectrum Analyzer ......
As last indicated ............
control to obtain maximum
Selector: SPECTRUM
height of spectrum pattern
AMPLIFIED
consistent with satisfactory
viewing.
b.
None.
b.
Adjust SWEEP FREQUENCY
control until maximum number
of vertical prf lines that can be
individually observed are
displayed.
c.
None.
c.
Adjust SPECTRUM WIDTH
control until spectrum pattern fills
crt as shown in fig. 5-27C.
a. Height of main
a.
On spectrum analyzer, compare
6
As last indicated ..........
As last indicated ............
lobe is at least twice
height of MAIN lobe to height of
the height of side
first side lobe on both sides of
lobes.
main lobe (fig. 5-27C).
b. Spectrum pattern
b.
Check spectrum pattern for
is stable with no
missing vertical prf lines and
missing prf lines.
stability.
a. No excessive
a.
On spectrum analyzer, serve
7
As last indicated ..........
As last indicated ............
magnetron frequency
spectrum pattern while slowly
pulling.
rotating azimuth Antenna AS-
5-71
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