17.
FM Gain
(8360
B-Series
Only)
Description
and
Procedure
This
adjustmen
t
sets
the
gain
on
the
FM
driv
er
assem
bly
to
match
the YO
FM coil
sensitivit
y
,
and
to
provide
a10
MHz/V FM
input sensitivit
y
.
The
function
generator
is
set
to
provide
FM at
a
1
MHz
rate
and
a
2.404
MHz
deviation.
This
corresp
onds
to
a
mo
dulation
index
of
2.404,
whic
h
should
result
in
no
p
o
w
er in
the carrier.
FM gain
is adjusted
to
minimize
the
RF
output p
ow
er.
1. Connect
the
equipmen
t
as
sho
wn
in
Figure
3-33
.
Preset
all
instrumen
ts
and
let
them
w
arm
up
for
at
least
one
hour.
Figure 3-33.
FM
Gain
Adjustment
Setup
Equipment
Function Generator
HP/Agilent 3325A
Spectrum Analyzer
HP/Agilent 8566B
Note
The function generator specied is accurate enough to set the amplitude
without using a DVM. If you use a dierent function generator, use a wide
bandwidth DVM, such as an HP/Agilent 3458A, to accurately set the voltage.
2. On the function generator, press:
Function: Sinewave
3-82 Adjustments
FM Gain
Agilent 8360
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