Filter
Top Products
ADJUSTMENTS MODEL 8559A
ADJUSTMENTS
5
-
26.
SECOND CONVERTER ADJUSTMENTS (Cont'd)
PROCEDURE:
Second LO Preliminary Adjustment
Allow one
-
half hour warm
-
up time of equipment with analyzer connected to mainframe with extender
cable.
Connect frequency counter input to
A5J3 2nd LO output using the test cable and two SMB adapters.
Select Band
1
(.01-3) and Alternate IF on spectrum analyzer front
-
panel by depressing these pushbut-
tons.
Using the special Allen
driverhut driver tuning tool, adjust A5Z4 2nd LO FREQUENCY for
a
frequency
counter indication of 2671.1 MHz
k
0.5 MHz.
Connect spectrum analyzer CAL OUTPUT to
RF
INPUT and adjust front
-
panel TUNING controls to
center the calibrator signal on the CRT display.
Set spectrum analyzer controls as follows:
FREQ
SPANiDIV
..........................................................
1 MHz
RES BW
.................................................................
300 kHz
TIME/DIV
...............................................................
2mSEC
.........................................
FREQUENCYBANDGHz BANDl(.Ol-3)
SIG IDENT
.................................................................
OFF
ALTIF
.....................................................................
OFF
853A
............................
TRACE A
&
B
STORE BLANK (ANALOG DISPLAY)
Depress front
-
panel SIG IDENT and ALT IF pushbuttons.
Turn SIG IDENT off and on while monitoring the display. The signal traces which appear when SIG
IDENT is switched on are the signal identifier signals. The others are the alternate IF signals.
Adjust TUNING to place one of the signal identifier signals on a graticule line. This will be the reference
graticule line.
Turn ALT IF off. Adjust
A8R34 REG to center the signal identifier signal on the reference graticule line.
Turn ALT IF on. Verify that the signal identifier signal appears on reference graticule line. If not, repeat
step 10.
Adjust
A8R40 SIG ID to place the alternate IF signal 1 MHz (1 division) higher than the signal identifier
signal.
Turn ALT IF off. Adjust
A8R39 OFF to center the signal on the same graticule line
as
the alternate IF
signal
(1 MHz higher than reference graticule line).