General Instrument C6M-II, Руководство по установке

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Overview 2-7
C6M-II Installation Manual
Key Feature Description
J The
COMP IF OUT
connector provides access to the internally
modulated composite IF signal at a nominal 30 dBmV level. The
video and audio correspond to the signal selected from the
VIDEO
A
/
B
and
AUDIO A
/
B
inputs, subcarrier or composite baseband (video
plus 4.5 MHz subcarrier inputs). If no video or audio signals are
present at the selected input, the signal consists of unmodulated
picture and sound carriers. This is an F-type coaxial connector.
K The
AUX
-
IF
input connector accepts an alternate composite IF
signal. This input precedes the IF gain control circuitry and can
accept a level range from 25 to 35 dBmV. This is an F-type
coaxial connector.
L
AUDIO A
input is normally a balanced 600 ohm input with a ground.
This can be switched using the menu to a high impedance input
(15 kohms). To switch to the high impedance input, choose
AUDZ HI on the Audio menu. The optional
AUDIO B
input is
identical to the
AUDIO A
input and is activated whenever the
VIDEO B
input is selected.
M
PRGM
-
IF
input has the same signal characteristics as the
AUX IF
input. Available only when the modulator option board is installed.
This is an F-type coaxial connector.
N
VIDEO IN A
is the primary video input connector (75-ohm baseband
video).
VIDEO IN B
is an optional input available only when the
modulator option board is installed.
VIDEO IN B
may be selected
through the video menu or by shorting to ground the
VIDEO B
terminal on the rear panel.
VIDEO IN B
will be activated in when
loss of video is detected on
VIDEO IN A
if this feature is enabled
through the menu. These are BNC type coaxial connectors.