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ADJUSTMENTS
/'
-
5
-
25.
FIRST CONVERTER ADJUSTMENTS (SERIAL PREFIX
2236A) (Cont'd)
FM Driver Adjustment
18. Disconnect frequency counter from analyzer
RF
Input and connect comb generator to RF Input,
19.
Set
comb generator for 1 MHz comb teeth.
20.
Set
analyzer controls
as
follows:
..........................................................
FREQ SPAN/DIV 1 MHz
..................................................................
RES BW 30 kHz
................................................................
TIME/DIV AUTO
...........................................
FREQUENCY BANDGHz Band 1 (.01-3)
............................................................
REF LEVEL dBm
-
20
..............................................................
INPUT ATTEN 0 dB
ALTIF
.................................................................
OFF(out)
.............................................................
SIG IDENT OFF (out)
........................................................
Amplitude Scale 10 dB/DIV
21. The front
-
panel TUNING control for approximately 1500 MHz indication on front
-
panel FREQUENCY
display.
22. Adjust front
-
panel TUNING FINE control to place a comb tooth on the first graticule line on the main
-
frame CRT display.
23. Adjust
A7R38 FM to place a comb tooth on the ninth graticule line.
24.
Readjust TUNING FINE control to place a comb tooth on the first graticule line and adjust A7R38 FM to
place a comb tooth on each of the graticule lines while keeping the first comb tooth aligned using the
TUNING FINE control.
25.
The to approximatel./ 100 MHz and verify that when a comb tooth is placed on the first graticule line
using the TUNING FINE control that the ninth comb tooth is aligned with the ninth graticule line
*
1
minor division.
26.
Repeat step 25 for frequency of approximately 2500 MHz.
27. If necessary,
A7R38 FM may be compromise adjusted for best span linearity at the three frequencies
indicated.
28.
Set
comb generator for 100
-
MHz comb teeth.
29. Adjust front
-
panel TUNING control for 100 MHz indication on FREQUENCY display
30. Set FREQ
SPAN/DIV to 2 MHz.
31. Adjust TUNING to place 100-MHz comb tooth on center graticule line.