
2 1. Frequency Response Adjustments
peaks of these responses coarsely outline the spectrum analyzer
frequency response.
I
I
I
II
I
I
I
I
II
I
II
I I
I
I
II
I
I
II
I
I I
u
START
5.88
GHZ
START
5.88
GHZ
STOP
12.58
GHZ
STOP
12.58
GHZ
RES
q W 3 MHZ
RES
q W 3 MHZ
“BW 3 MHZ“BW 3 MHZ SWP 2.00
set
SWP 2.00
set
Figure 3-97.Figure 3-97.
Typical Coarse Frequency Response (5.8
GHz
-
12.5
GHz)
Typical Coarse Frequency Response (5.8
GHz
-
12.5
GHz)
Note
It might be helpful to temporarily change the spectrum analyzer
@WEEP TIME] setting while adjusting frequency response, particularly
when making fine adjustments. An increase in spectrum analyzer
sweep time results in closer spacing of the displayed responses, but
slows the adjustment. Do not decrease the (SWEEP TIME) setting below
1s.
before the YTX Delay Compensation adjustments have been made.
98. Gradually adjust (Band C Lower Segment) A6AllR54 Cl and
(Band C Upper Segment)
A6AllR72
C2 for maximum flatness of
the displayed signal responses. The adjustments are interactive,
with A6AllR54 Cl having the most effect on the level of the
displayed signals below mid-band (approximately 9.1
GHz),
and
A6Al
lR72
C2 having the most effect on the level of
the displayed signals above mid-band. Adjust A6AllR54 Cl
counterclockwise to increase the level of the displayed signal
responses below mid-band. Adjust A6Al
lR72
C2 clockwise
to increase the level of the displayed signal responses above
mid-band. See Figure 3-90 for the locations of A6AllR54 Cl and
A6Al
lR72
C2.
Note
If the displayed signals at the high end of the band drop off by more
than 2-3
dB,
center A6AllR72 C2 and proceed to step 99.
99. On the spectrum analyzer, key in (SWEEP
TIME]
5s,
LOG SCALE
(ENTER
dB/biv]
1
dB,
TRACE B
(VIEW),
(SAVE]
4, (SWEEP TIME]
2s,
TRACE B
(jj],
[HOLD).
100. Readjust 17-turn (YTX Diode Bias) potentiometer
A6AlOR15
VC
to maximize the overall level of the displayed signal responses
from 5.8
GHz
to 12.5
GHz
on the spectrum analyzer display.
Then, adjust
A6AlOR15
VC clockwise until signal responses at
the high end of the band drop in amplitude by approximately 0.5
dB.
Adjustments 3-191
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