Specifications
2-10. VIDEO/BASEBAND CONNECTIONS. - Baseband connections are BNC
connectors on the rear of the shelf. A detailed description of the connections are:
Transmitter:
Input ... Video input from video source. If video is not used this port is terminated with 75
ohms. In multiple-unit operation, the input of units after the first is connected to the
output of the preceding unit.
Output ..Composite output to microwave or satellite transmitter. In multiple unit operation, the
output of all but the last unit connects to the input of subsequent units.
Receiver:
Input ... Composite input from microwave or satellite receiver. In multiple-unit operation, the
input of units after the first is connected to the output of the preceding unit.
Output .. Video output to monitor or video receiving equipment. If video is not used, this port
is terminated with 75 ohms. In multiple unit operation, the output of all but the last
unit connects to the input of subsequent units.
2-11. VIDEO FILTERING. - The video source should be adequately filtered to prevent
harmonics or other high frequency components from interfering with the low level subcarrier
signals in the upper part of the baseband. If the video signal source does not include a suitable
lowpass filter, a video lowpass filter should be added to the system between the video source and
the first subcarrier transmitter.
At the receive site, video quality is improved by using a filter to remove the high frequency
subcarrier signals prior to the video equipment. If an adequate video lowpass filter is not included
in the video receiving equipment, one should be added between the last subcarrier receiver and the
video equipment.
CAUTION: NO
OPERATOR
SERVICEABLE PARTS
INSIDE. REFER
SERVICING TO
QUALIFIED
PERSONNEL.
ALM
N
O
C
O
M
N
C T
FOR CONTINUOUS
FIRE PROTECTION
REPLACE ONLY WITH
SPECIFIED TYPE AND
RATED FUSE
CAUTIO
N:
INPUT OUTPUT
LINE VOLTAGE RANGE
FUSE 250V
105V-130V 50-60Hz
2 A
210V-250V 50-60Hz
1 A
R T R
A B
Figure 2.2 450 Subcarrier Transmitter and Receiver Rear Panel
450 Operation Manual Rev A Page 14 8/26/99