16.
Rotate
the
TRA
CKING
ADJUST
control
fully
counterclockwise
.
Record
the
frequency
counter
reading
in
T
able
5-7
as
F2.
17.
Calculate
F
CENTER
as
shown
below
and
record
the
result
in
T
able
5-7.
F
CENTER
=
(F1
+
F2)
/
2
18.
Set
TRA
CKING
ADJUST
for
a
frequency
counter
reading
of
F
CENTER
6100
Hz.
Note
The
coarse
adjustment,
A2C3,
is
rated
for
a
maximum
of
10
adjustment
cycles
.
Because
of
this
limitation,
adjust
A2C3
only
when
absolutely
necessary
.
19.
A
djust
A2C3
until
the
frequency
counter
reads
300
MHz
6500
Hz.
20.
Repeat
steps
15
through
19
at
least
once
more
until
no
further
adjustment
of
A2C3
is
necessary
.
21.
Set
the
tracking
generator
LINE
switch
to
OFF
.
Replace
A2
dust-
cap
screw
.
22.
Repeat
the
ne
adjustment
procedure
,
steps
four
through
12.
T
able
5-7.
Tracking
Oscillator
Range
Centering
F1
(MHz)
F2
(MHz)
F
CENTER
(MHz)
5-18
Adjustment
Procedures
HP
85640A
RF
T
racking
Generator
Operation
and
Service
Manual
Содержание 85640A
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