h. Peak the 5.5 GHz signal with the Preselector Sense,
R1065 adjustment.
Calibration—492/492P Service Vol. 1 (SN B030000 & up)
Adjustment Procedure
i. Repeat parts f through h to ensure that the 2.1 and
5.5 GHz frequency points track the input tuning.
j. Change the FREQUENCY RANGE to band 4
(5.4—18.0 GHz). Center the 6 GHz marker on screen with
the FREQUENCY control, then press the DEGAUSS button.
Peak the 6 GHz signal with the front-panel PEAKING
control.
k. Adjust FREQUENCY to center the 9 GHz marker on
screen. Peak this response with the X3 Gain, R1052
adjustment.
I. Repeat parts j and k to ensure tracking over this
range.
m. Increase FREQUENCY to the 12 GHz marker, press
DEGAUSS, then peak the 12 GHz point with Shaper #1,
R1054 adjustment (Fig. 3-52).
n. Adjust FREQUENCY to center the 17 GHz marker,
press DEGAUSS, then peak the signal with Shaper #2,
R1056 adjustment.
o. Recheck the 6 , 9,12, and 17 GHz points to verify that
they all peak at the same position of the front-panel
PEAKING control. If they do not, repeat parts g through n.
p. Change the FREQUENCY RANGE to the
1.7—5.5 GHz band. Center a comb marker between 5.4
and 5.5 GHz, press DEGAUSS, then peak the signal with
the front-panel PEAKING control.
q. Change FREQUENCY RANGE to the 5.4—18.0 GHz
band and center the same signal used in part p with the
FREQUENCY control. Press DEGAUSS, then adjust Input
Offset R1031, to peak the signal.
r. Repeat parts p through q until the signal amplitude
peaks, on both bands, occur at the same position of the
PEAKING control.
8. Set PEAKING control so the index mark aligns with
the front-panel mark. Change FREQUENCY RANGE to
1.7—5.5 GHz, adjust FREQUENCY to center the 3.5 GHz
comb marker, then press DEGAUSS.
3-76
t. Adjust -829 MHz IF Offset R1049 (Fig. 3-52) to peak
the 3.5 GHz response.
u. Change FREQUENCY RANGE to 3.0—7.1 GHz and
center 5.0 GHz marker signal on screen with the FRE
QUENCY control after the DEGAUSS button has been
pressed.
v. Peak the 5.0 GHz signal with the +829 MHz IF Offset
R1045 adjustment.
w. Change FREQUENCY RANGE to 15—21 GHz and
adjust FREQUENCY to center the 15 GHz marker on
screen. Press the DEGAUSS button as signal is tuned to
center screen.
x. Peak the 15 GHz signal with the front-panel
PEAKING control.
y. Tune the 19 GHz marker to center screen and press
DEGAUSS.
z. Peak the 19 GHz signal with Shaper #3, R1061, ad
justment (Fig. 3-48).
aa. Tune to the 21 GHz marker, degauss, then peak the
signal with Shaper #4, R1063, adjustment.
ab. Recheck the 15,19, and 21 GHz points to verify that
they all peak at the same position of the PEAKING control.
ac. Change the FREQUENCY RANGE to 5.4—18 GHz,
then center the 15 GHz marker on screen. Degauss as the
signal is centered.
ad. Peak the signal with the PEAKING control, then
switch FREQUENCY RANGE to 15—21 GHz and center
the same 15 GHz marker on screen. Press the DEGAUSS
button.
ae. Peak the 15 GHz signal with Preselector Offset,
R1064, if necessary.
af. Change FREQUENCY RANGE to 3.0—7.1 GHz and
center a 5.0 GHz signal on screen. Press DEGAUSS as the
signal is centered.
REV SEP 1983
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