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|  M I L - T - 4 8 6 2 1 A (AR)
d.
Using the RF spectrum analyzer (item 31, Table III)
connected to the RF Out port of the noise tester as an
indicator, adjust the REF LEVEL control so that the
reference oscillator FM sideband is 30 DB below the
carrier.
e.
On the noise tester, detune the FREQ TUNE coarse control
at least one channel (8MHZ) away from the actual
frequency being measured.
f.
Set the noise tester
controls as fellows:
(1)
OPER/TEST switch to BAL position. Adjust BAL ADJ
control for a center line meter indication.
Adjust FREQ
(2)
OPER/TEST switch to CAV TUNE
position.
TUNE control to the rough init ial setting for
Channel 1 of the microwave power SOUrCe (item 18,
Table III).
Adjust the FREQ TUNE controls, first coarse then
(3)
fine, for mazimum red deflection as indicated on
the NOISE INDICATOR meter. Adjust the RF LEVEL
control as necessary to keep the meter reading on
scale during peaking procedureo set rf level
control so that meter reads full red deflection not
planed-after attaining peak. Lock the cavity.
Note: This step is extremely important; the peak
must be true and the cavity locked to prevent
instability.
Sat the OPER/TEST
to the PHASE SHIFT
(4)
switch
position. Adjust the PHASE AIM control for a
center line meter indication.
Set the OPER/TEST switch to BAND 3 OPERATE, or for
(5)
the band-under-test. Recheck sideband level set in
d. Adjust the GAIN ADJ control for a center line
meter indication.
38
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