Sierra Video HDA-109 - Manual (Page 15)

OG-HDA-109
9
Video Connections
OG-HDA-10 and OG-HDA-21
Each of these rear panels provides a single input with 9 outputs. Eight of the outputs can
pass DVB/ASI signals. The inverted output will not pass DVB/ASI signals.
OG-HDA-22
The OG-HDA-22 is built to accept two DA boards.
When the OG-HDA-22 is used then only four outputs are available
Video system interconnects are made by using 75 ohm transmission lines (coax cable).
The device driving the line has a “source” impedance of 75 ohms, the cable has a 75
ohm impedance and the end of the interconnect is internally terminated with 75 ohms.
The accuracy of the termination affects signal level. Use either a 1% or 0.1% termination.
Unused amplifier positions do not need a termination.
Only the outputs which are used need to be terminated.