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Page Title:
Figure 4. SIGNAL ATTENUATOR DB control circuitry, block diagram |
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|  Figure 4. S I G N A L
ATTENUATOR
DB control circuitry, block diagram.
impedance of the s i g n a 1 input
of attenuation in the if. signal path.
coaxial cable. In addition, only this
(5) I n the 60 position of the control,
position of the control rotates wafer
40-db of attenuation is inserted in
switch S701 (front) to a contact that
the rf signal path. Simultaneously,
c h a n g e s the full-scale indication
wafer switch S701 (rear) is rotated
(the sensitivity) of the panel-
to a position that continues to in-
mounted meter by + 10-db.
t r o d u c e a 20-db of attenuation in
(3) In the 20 position, 10-db of attenua-
the if. signal path.
tion is inserted in the rf signal oath.
(6) I n the 80 position of the control,
Wafer switch S701 (front) is simul-
60-db of attenuation is inserted in
taneously rotated to a position that
the rf signal path. Simultaneously,
r e s t o r e s the full-scale indication
wafer switch S701 (rear) is rotated
o f the meter to its original sensi-
to a position that continues to in-
tivity. Wafer switch S701 (rear) is
troduce 20-db of attenuation in the
simultaneously r o t a t e d t o a
if. signal path.
p o s i t i o n that introduces 10-db of
a t t e n u a t i o n in the if. signal path.
b . I f . Attenuating Circuit. The inser-
(4) In the 40 position of the control, 20-
tion of fixed steps of attenuation in the if.
db of attenuation is inserted in the
signal path is performed by the action of
rf s i g n a 1 path. Simultaneously,
t h e rear section of wafer switch S701. In
wafer switch S701 (rear) is rotated
the 0 SUBST. ONLY and 0 CW ONLY posi-
to a position that introduces 20-db
t i o n s of this switch, no if. attenuation is
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