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Guide to TV antenna installation

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Using A Voltage Block with your TV Antenna Mast Mounted Preamplifier


Voltage Block

>>>>>>>Voltage Block


A Voltage block is used in conjunction with mast a mounted preamplifier and a signal splitter when it's not inconvenient to have the signal splitter on the TV side of the preamplifier power injector.

Mast mounted preamplifier's are comprised of two separate parts. The mast mounted portion where the amplification takes place and the indoor power injector that supplies the electricity for the operation of the mast mounted unit. To do this the power injector supplies low voltage electricity into the down lead coax cable that's coming down from the mast mounted preamplifier near the antenna. A signal splitter installed on the coax cable down lead between the indoor power injector and the mast mounted amplifier can interrupt the electricity and cause the preamplifier to malfunction.

When to use a voltage block.
When a signal splitter is located on the coax cable down lead between the indoor power injector and the mast mounted preamplifier. Many times a signal splitter is located in the attic or outside on the side of the home where an electrical outlet for the power injector is not available. Rather then rewire the entire system voltage blocks can be used at the signal splitter as shown below.

When not to use a voltage block.
When the coax cable down lead runs directly from the mast mounted preamplifier to the indoor power injector and the signal splitter is located on the TV side of the power injector.


Winegard mast mounted preamplifier Winegard power injector and transformer

Winegard Mast Mounted Preamplifier

Winegard Indoor Power Injector Unit
and electrical transformer


preamplifier power injector

The preamplifier power injector above can be located
near one of the TV's. The TV signals feed into the ANT
port of the injector and back out of the TV port to the TV at that location.


2 way signal splitter and voltage block configuration

2 way signal splitter and voltage block configuration
Above: The top cable is coming from the preamplifier at the antenna. The cable on the bottom right is leading to TV #2. The cable on the bottom left leads to the power injector ANT input connection. Now run a cable from the power injector TV connection to TV #1. Both TV's will benefit from the preamplifier at the antenna. See diagram below.


3 way signal splitter and voltage block configuration

3 way signals splitter and voltage block configuration
Above: The top cable is coming from the preamplifier at the antenna. The cable on the bottom left leads to the power injector connection labeled ANT. Now run cable from the power injector connection labeled TV to the #1 TV. The bottom 2 cables on the right lead to TV #2 and #3. All TV's benefit from the preamplifier at the antenna. See diagram below.


4 way signal splitter and voltage block configuration

4 way signal splitter and voltage block configuration.
Above: The top left cable is coming from the preamplifier at the antenna. The cable on the bottom left leads to the power injector connection labeled ANT. Now run cable from the power injector connection labeled TV to the #1 TV. The bottom 3 cables on the right lead to TV #2, #3, and #4. All TV's benefit from the preamplifier at the antenna. See diagram below.

6 and 8 way signal splitters are configured in the same manner.
Install a voltage block on each output port that does not lead to the power injector.
A 6 way splitter will need 5 voltage blocks and an 8 way will need 7. 

 

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Example: 4 way signal splitter configuration

Voltage block use

 

 


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