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CONNECTING THE POWER SUPPLY UNIT (PSU)
Calculate the total current consumption of the Multiswitch(es), LNB and
any Launch Amplifiers that make up the complete IRS System. The current
consumption of the Series D Multiswitch range can be found in the Specification
section of this manual. If in doubt, assume the current consumption of each
LNB to be 200mA max (0.2A). Connect a suitable Whyte PSU to the Auxiliary
18V DC Input. If more than one PSU is required, the additional PSU(s) may be
connected to any other Multiswitch, Launch Amplifier, Tap or Splitter within the
system. When all connections have been made, connect the PSU to a 240V
supply to power up the IRS System. It is
highly advisable
to isolate and hence
divide the system in to DC Groups containing only a single PSU per group, by
using F-type DC blockers (not supplied).
Connecting the Subscriber Cables
Terminate the Subscriber Cables with good quality F Connectors and connect to the Subscriber
Outputs. The F Connectors should be fitted to the coaxial cable correctly, ensuring that the centre
core protrudes 3mm above the F Connector body.
See figure 3.
Ensure that you do not exceed the
bending radius of the Coaxial Cable being used. The Subscriber Cables may be arranged either
side of the Multiswitch before being terminated and connected. If required, the Subscriber Cables
may be arranged to one side of the Multiswitch, with the cables passing under the Multiswitch before
being terminated and connected to the Subscriber Outputs on the opposite side.
See figure 4.
Always use CAI approved high quality coaxial cable.
Connecting the Power Supply Unit (PSU)
The PSU must be fixed to the relevant wall surface using the appropriate fixings. Connect the DC F-
type lead to the 18V DC Input of the Multiswitch.
Once all connections have been made, connect the plug to a 240V socket to power up the
Multiswitch. If a local mains supply is not available such as in lofts and outdoor cabinets, the Power
Supply Unit may be conveniently fitted elsewhere whereby the 18V DC F-Type lead may be extended
using coaxial cable.
5
Whyte
Earth Bonding
Earth bond the Multiswitch to the Earth Bonding Lug using minimum 4mm² Earth Bonding Cable.
Make sure that the Earth Bonding Cable is connected directly to the building’s PME (Protective
Multiple Earthing) point.
Figure 3
3mm
Figure 4
Whyte
COMMISSIONING THE MULTISWITCH
See Figure 4:
1. Connect a spectrum analyser to any Subscriber Output of the first Multiswitch
2. Set the TERR Pro-Tap to -20dB
3. Set the Spectrum Analyser to Terrestrial. Using the TERR Gain Control adjust
the Terrestrial signal to the required digital channel power level. If the signal
cannot reach the required level, set the TERR Pro-Tap to -10dB and readjust the
TERR Gain Control. If required, set the Pro-Tap to -0dB and readjust the Gain
Control.
4. Check the SAT signal levels in Legacy and dSCR mode. These will not require
adjustment as they are self-commissioned using Automatic Gain Control.
5. Repeat the above for all other Multiswitches in the IRS System as applies.
CONNECTING THE SUBSCRIBER CABLES
Terminate the Subscriber Cables with good quality F Connectors and connect to
the Subscriber Outputs. The F Connectors should be fitted to the coaxial cable
correctly, ensuring that the centre core protrudes 3mm above the F Connector
body.
See figure 3.
Ensure that you do not exceed the bending radius of the
Coaxial Cable being used.
USER BAND FREQUENCIES