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ADJUSTMENTS
5
-
25.
FIRST CONVERTER ADJUSTMENTS (SERIAL PREFIX 2236A)
REFERENCE:
A3, A4, AS, A6, and A7 Schematics
DESCRIPTION:
The First LO (A6 YTO) is adjusted by monitoring the
YTO output at the
RF
input connector (LO feedthrough)
and the tuning voltage
(TUNE)
output of the A7 Frequency Control board and adjusting the
YTO
low
-
end
frequency for 3
GHz at OV tuning voltage and 6 GHz at
-
10V tuning voltage.
The FM Driver is adjusted by inputting comb signals to the analyzer and adjusting for proper spacing (span
linearity) of displayed signals on the CRT display.
DISPLAY DIGITAL VOLTMETER
COMB
FREQUENCYCOUNTER GENERATOR
EXTENDER
CABLE
ASSEMBLY
Al6TPl
P
LOCATED A7TP4
THROUGH TUNE
HOLEIN
/
\
SIDE FRAME
-
.fq
:%?:
HERE
SPECTRUM
;
((9
io)'(i3
ANALYZER
,,,,or,
,
,.,-
*
fd
INPUT
INPUT
I
OUTPUT
I
FIGURE
51
1.
FIRST CONVERTER ADJUSTMENTS TEST SETUP
EQUIPMENT:
FrequencyCounter
.......................................................
HP5340A
Digital Voltmeter (DVM)
..................................................
HP 3490A
Comb Generator
........................................................
HP 8406A
PROCEDURE:
1.
Allow one
-
half hour warmup time of equipment with analyzer connected to mainframe with extender
cable.
First
LO
Adjustments
2.
Connect DVM to A7TP4 TUNE.
3. Set analyzer controls
as
follows:
INPUT
ATTEN
..............................................................
0 dB
FREQ
SPAN/DIV
.........................................................
0 (zero)
ALTIF
.................................................................
OFF(out)