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Model
8672A
Operation
Table
3-1. Front
Panel
Features
(2
of
2)
^y
LINE
switch: applies power to the Synthesizer when
set
to the ON position; power
is
supplied to the
crystal oven and
the battery
charger
circuit
in the
STANDBY
position.
0
FREQUENCY RESOLUTION
pushbuttons:
selects
tuning resolution in
100
MHz,
1
MHz,
10
kHz,
or
1,2,
or
3
kHz
steps
(depending on the frequency selected).
The HOLD
switch
^M
clears
any frequency
resolu¬
tion
selected.
^ff
TUNING
control: changes the Synthesizer's
output
frequency by the increments selected by the FRE¬
QUENCY RESOLUTION
selectors
(f)
.
0
AM
function
switch:
selects
OFF, 30%/V,
or
100%/V
modulation by
a
signal
applied to the
AM
INPUT
connector®
.
The
selected range
is
display¬
ed on
the
AM
annunciator
Q
.
Modulation
per¬
centage
is
read on the Meter
Q
when the
METER
MODE
selector
@
is
set
to
AM.
AM
may
be
re¬
motely
programmed.
^j
FIVI
INPUT
connector: accepts
a
maximum
1
Vpk
external modulation
signal
(500
source impedance).
Deviation
varies
linearly with the input
signal. Devia¬
tion
ranges are
controlled by the
FM DEVIATION
switch
^)
or remotely programmed.
^ft
ALC
switch: selects either internal
(INT)
leveling,
external
crystal
(XTAL),
or external power meter
(PWR
MTR)
leveling.
The external
leveling device
(crystal or power meter) may
have
either
a
positive or
negative
output. The ALC
selector can
be
remotely
programmed.
Q)
FM
DEVIATION
MHz
switch:
selects
the
meter
scale
and peak deviation that
is
obtained with
a
signal
applied
to
the
FM INPUT
connector
Q
.
The
peak
deviation
range
is
displayed on the
FM
annunciator
U9
and the actual peak deviation
is
read
from
the
selected scale on the
Meter
A
.
The FM DEVIA¬
TION
MHz
selector can
be
remotely programmed.
^
AM INPUT
connector: accepts
a
maximum
1
Vpk
external modulation
signal
(600
ohm impedance).
A
1
Vpk
signal
develops
full
scale
modulation
as
se¬
lected
by
the
AM
selector
^
or
as
programmed
remotely. Percent modulation
varies
linearly with the
input
signal.
0
OUTPUT LEVEL VERNIER:
adjusts
the
RF
output
level over the range
of
+3 to —10 dB, relative
to
the
Output
Level Range
as
read on the
Meter
^^
.
The
Vernier function
is
programmable
in
1
dB
steps.
^W
EXT ALC INPUT
connector:
accepts positive
or
nega¬
tive leveling
signals
from either
a
power meter or
crys¬
tal detector
as
selected by the
ALC
selector
^M
.
^y
Mechanical Meter
Zero:
sets
meter
suspension
so
the
Meter
^X
indicates zero when
power
is
removed
from
the Synthesizer and the Synthesizer
is
in its
nor¬
mal operating position.
^ff
CAL
control: adjusts the
ALC
gain
to match the
ex¬
ternal leveling device in
use.
The
CAL
control
must
be
returned to the
fully
clockwise position when the
Synthesizer
is
returned
to
internal leveling.
0
OUTPUT LEVEL RANGE:
selects
the
RF
output
level
range
in
10
dB
steps
from +10 to —110 dBm.
The
selected range
is
displayed by the
RANGE
dBm
LED
readout
^J
.
The
range
may
also
be
pro¬
grammed remotely.
®
PEAK-NORM control:
generally left
in the
NORM
de
tented
position
(fully
clockwise).
It
is
used
to
peak
the
RF
output at
a
particular frequency
in
the
band
at the expense
of power
at
other
frequencies.
@
RF OUTPUT connector: 50 ohm type-N
female
con¬
nector supplies the
RF
output
over the entire
fre¬
quency
range
of
2
to 18 GHz.
Qf
RF
switch:
completely turns
off
the
RF
output
when
in
the
OFF
position. This condition
is
displayed
in
the
RF annunciator
^X
and
causes
the
NOT
PHASE
LOCKED
annunciator
in
the
STATUS
Block
^V
to illuminate. When the ON position
is
selected,
the Synthesizer returns to normal operation. The
functions
of
the
RF
switch are
programmable.
©
METER MODE
switch: selects
either
LEVEL, AM,
or
FM
to
be
displayed
on the
meter
S^
.
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