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494A1494Ap
Service
Vot.
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Table
6-4
SELECTED
COMPONENTS
t
Number
422A1Rl070
422A1R2049
422A1R2070
422A1R2072
A46A1R1011
1Rl012
446A1Rl013
446A1 Rl014
A46A1
Rl015
446A1Rl010
1R1020
446A1Rl048
Rl049
446A1R1050
1Rl
A46A1Rl052
A46A1Rl053
A46A1Rl055
45045C1038
450A5C1048
450A2C1016
A50A2C1018
A50A2C1032
450A2C1024
Surface-Mounted
Components
Surface-mounted
components
are
used
in this
instrument. These
components
are
mounted
on
pads
on
the
circuit
board,
rather
than
through
holes
in
the
board.
(ln
some
rare
instances,
components
may
be
mount€d on
pads
around
through
holes.)
Lead
configurations
of
these
components
are
shown
in
Figure
6-1.
The
positive
end
of
electrolytic
capacitors
is
identified
with a
band.
Other
capacitors
and
resistors
have no
visible identification.
However, like
their
axial-
leaded
counterparts,
their
values
can
be measured
with
a meter.
Surface-mounted
semiconductor
devices
are
sensi-
tive
to
static
€lectricity
discharges,
and
should
be
treated as
outlined in
the
beginning of
this section.
Selection Crlteria
Sets Reference Mixer
output
at
18
MHz
linearity of
the 2nd
LO
sweep
Adjusts 2nd LO
tune range
Sets
2nd LO
sweep
Matched
for
temperature coefficient
to 5PPM/oC
Matched for
temperature coefficient
to
SPPM/"C
Match€d
for
t€mperature coefficient
to
SPPM/oC
Matched
for temperature
coefiicient
to SPPMI"C
Matched
for temperature coefiicient
to
SPPM/"C
Matched
for
temperature
coefficient
to SPPM/oC
Move
C1041
frequency
adjustment range
Move
Cl042
frequency
adjustment range
FL1
024 inputloutput i mpedance match
3.3
pF-27
pF
3.3
pF-27
pF
3.3
pF-27
pF
.#
TRATT|3IION
#.
OIO€
E
CATE
I
2
t
a
t
f
c
5
t-
\
c
6-16
Figure
6-1. Surface-mounted
components
lead
conliguration.