TFT 844 - Page 13

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3.3.2
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FREQ.
COUNTER
jack
Thumbwheel
switches
Model
844
Rear
Panel
Name
RF
INPUT-LOW
LEVEL
jack
HI
LEVEL
RF
INPUT
SET
Lamp
RF
INPUT-HIGH
LEVEL
jack
HIGH
LEVEL
RF
INPUT
SET
control
FUSE
and
AC
VOLTAGE
SET
AC
POWER
CORD
CONNECTOR
High
level operating
frequency
COMPOSITE
jack
To
SCA
Monitor jack
_12-
BNC
connector supplies
selected frequency
for
connection to a frequency
counter.
The
two
rows
of
thumbwheel
switches allow
of
two
channels.
(See Fig. 3-2)
Function
Used
to
connect
an
antenna
input with signal level
between
10
and
100
MV
(75
ohm)
Lamp
indicates
when
the high
level
RF
input level
has
properly
been
adjusted.
Used
to
connect signal input
with level
between
1 Volt to
10
Volts.
(50
ohms)
Control adjusts attenuation
to the high level
RF
input
for proper operating
level.
Fuse
holder
and
terminal
board
which
allows
setting
of
AC
input voltage
to
120
VAC
or
240
VAC
.
Connect
120
VAC
or
240
AVC
to
monitor.
Shows
the
RF
input - high
level preset frequency
(To
change
this
frequency, a
internal
crystal
must
be
replaced for high level
input only).
Allows
connection of the
composite signal
to
external
monitoring.
Provides composite output
to
drive a
model
730A
SCA
monitor.