HP 3585A Service Manual page 209

Spectrum analyzer
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Salns by => ARTEK NED�
DC
COf'lTRUL
VUL T"G�
F I R S T
----
-
-,
I
I
V O l T A G E
; RA T O R
1 0 0KHz
R E F E R E N C E A 2 1
f RAC .
"I
C O N T R O L
:ONTRDL
� P I DATA
J
____
P
trJ 2003-200S
LO
TUNE
VTO
-
a
L O V T
I
I
B U F F E R
At.
TO F I R S T
" l XER
B U F F E R
1
S U M L O O P
_
_
FROM
­
FE
L O B U F
R
B U F F E R
TO TRACKING
CENERATOR "52
B U F F ER
B U F F E R
lIMP
B U F F E R
,
I
,
,
I
,
MODE
" L O O P
---
-
-
-
-
--- - - ---- -
OIVDERS
A
D
V T O
N
SUI1
100. 3 5- 1 4 0 . 35HH2
l O OP O U T P U T
I
B U F F ER!
D C
L E V E L S H I F T E R
25
3.� I1H2
T O
LO
P
O
PHA S E D E T E C T O R -
_
_
fR"C . 'I ERROR
,
,
,- - - - - - - - ,
SL
!
, 0
( 1 . 7 5 - 3 M H z l
* 2 0
f R A C N O U T P U T
" F RA C T I O NA L N C O N T R O L L l N E S
MODE
l O OP
S I N G L E L O O P
L OW
I
I1 U L T I P L E L O OP
H I GH
I
ML = MUL T I P L E L O O P
-.J
S L =
S I N G L E L O OP
___
_
_
Figure 6- 1 2 . Local Oscillator Block Diagram
L O
-,
O
a
V T
C
N T R O l
I
I
I
SUI1
ERROR
l O OP
-- -- -
-
-
--
H S L S C N
H I G H
L OW
6-25/6-26

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