Specifications

Composite Monitor - This output connector provides a monitor point for the combined
modulation signal resulting from the various input signals. The output impedance is 75Ω and
should be terminated with 75Ω when measurements are being made.
FIGURE 2 -3 455 TX and RX Connectors (RX has BTSC Inputs plugged)
Receiver:
BTSC Composite Out - This 75Ω output is the recovered MTS/BTSC composite signal
from the receiver. The output should be connected to equipment having an input impedance
of 75Ω; if the connecting equipment is high impedance, a 75Ω termination should be added at
the end furthest from the 455.
2-13. 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 may be added between the last subcarrier
receiver and the video equipment.
455 Operation Manual Page 16 6/23/98
ALM
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C
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M
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BTSC
COMPOSITE
BASE BAND
LOOP THRU
BTSC
COMPOSITE
STEREO
SAP PRO
I NPUTS
IN (XMT)
OUT (RCV)
MONITOR INPUT OUTPUT