KVH Industries TracVision TV6 Installation Manual page 37

A Continued
Band/Polarization Control
If your configuration consists of linear receivers
connected via a multiswitch, and you installed
one or more IP AutoSwitches, KVH recommends
that you change the TV-Hub's Band/Polarization
Control setting to TV-Hub (see Figure 60). You
can find this setting on the Advanced Settings
page of the web interface (go to Settings >
Advanced Settings).
Description
TV channels can be carried on any of a linear
satellite's four combinations of frequency band
and polarization. Since only one of these signals
can be delivered to a receiver at any one time, the
receiver outputs a voltage/tone to request the
band/polarization for the selected channel:
Voltage Tone
13 VDC Off
18 VDC Off
13 VDC On
18 VDC On
Since the voltage/tone from the master receiver
could differ from the voltage/tone present on the
TV-Hub's "Receiver" jack, the TV-Hub will
output band/polarization on that jack based on
the Band/Polarization Control setting:
• Master Receiver (default setting): The output
of the TV-Hub's "Receiver" port is the band
and polarization that is currently selected by
the master receiver. This setting ensures the
antenna always has a valid band/
polarization on which to track the satellite.
• TV-Hub: The TV-Hub ignores voltage/tone
from the master receiver and outputs
whichever band/polarization corresponds to
the voltage/tone that is present on the coax
cable connected to its "Receiver" port (see
Figure 61). This allows a multiswitch to
continue receiving all four combinations of
band/polarization from the antenna.
36
Installing an IP AutoSwitch
Polarization Band
Vertical Low
Horizontal Low
Vertical High
Horizontal High
Figure 60: Band/Polarization Control Setting
Figure 61: Linear Receivers with Multiswitch and IP AutoSwitch
TV-Hub
Receiver
Router
1 2 Ethernet 3 4 Internet Reset 12VDC
POWER
Voltage/Tone of
Multiswitch Port
Voltage/Tone of
Selected Channel
18V/
22
KHz
13V
13V/
22
18V
KHz
18V 13V 18V/ 13V/
22KHz 22KHz
Multiswitch
Receiver
IP AutoSwitch
Master Receiver