Installing Multiple Modulators
•
Set up and connect the modulator to coax network or TV set one modulator at a time.
• Make sure the following settings for HDMI video modulation are different among modulators
①
Output frequency refer to the section
Choose Modulated Output Frequency for HDMI
Video on TV to pick up different output frequencies for different
modulators
②
Channel name
default channel name on ST-7632 series is SLK HD1, the channel naming
can be SLK HD
n
, where
n
indicates the modulator count.
③
Channel number and subchannel number (available on ATSC modulator only)
• A combiner or multiplexer is needed to combine the output signals of multiple modulators if the
coax network and the TV sets share the source of video output of modulators.
• If ST-7632 modulator is used together with other brands’ modulators, harmony settings of RF
output (power) level and output frequency must be found. Refer to the section
Combining Service
Provider Signals for more information.
• Make a note on each modulator with RF output level and output frequency for quick reference
and easy trouble shooting whenever needed.
• If more than more than 40 TV sets are connected to share the modulator output signal, it might
be necessary to use active splitter or combiner to amplify the output power to reach individual
TV at the far end. The receiving power of each TV should be higher than 75
dBµV
or the signal
can be instable.
•
Depending on the quality and aged damage, splitters, combiners and coaxial cable itself can
introduce high attenuation or insertion loss to the coax wiring. Power loss budget calculation
might be necessary along the delivery path.
In case multiple units of ST-7632 series modulators are installed on the same coax network/wiring
or
connected to the same TV set, pay attention to following items to avoid conflicts or interference
among modulators.
10
ST-7632 Series HD Modulator
