TV ANTENNA PREAMPLIFIER
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TV Antenna Mast Mounted Amplifier

Winegard TV Antenna Preamplifier
Power Supply and Injector.

Winegard Power Injector

Winegard mast mounted preamplifier

Winegard mast mounted antenna and preamplifier are lying upside down.

Winegard Power supply
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Above is the bottom view of a Winegard mast mounted preamplifier.

On the left is the coax cable coming from the antenna going to the preamplifier ANT INPUT connection. The coax cable length from the antenna to the preamplifier should be kept as short as possible for the best results.

On the right is the coax cable leading indoors to the power supply/injector ANT in. connection. No signal splitters should be installed on the coax cable between the mast mounted preamplifier and the power supply without the use of voltage blocks. (see voltage block below)However, there should be a ground block (lightning arrestor) installed on this cable at the location just before the cable enters the house. 

Above is a Winegard preamplifier power injector and power supply. This unit is located indoors and requires an electrical outlet. It can be located just a few feet from the mast mounted preamplifier (attic installations) to as much as 150 feet away. The power supply and injector

Shown above: the coax cable on the bottom left coming out of the power injector is ran to the mast mounted preamplifier to the To Power Supply connection shown top left.

The coax cable on the bottom right is connected to the power supply and the transformer is plugged into an electrical outlet when the installation is complete. The coax cable between the power supply and injector can be lengthen to power the unit from a remote location.

The coax cable on the top coming out of the power injector is ran to the TV or it can be ran to a signal splitterto supply multiple TV's

Voltage Block - A signal splitter can be installed on the coax cable down lead between the mast mounted preamplifier and the indoor power injector. Learn how by searching voltage block in the search at the top left of the main page and then click on How to use voltage blocks.

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When and Why to use a Preamplifier

The TV signal from your TV antenna becomes weaker as it travels through the coax cable to your TV.The farther it must travel the weaker it becomes. Signal splitters also weaken the signal. The more times the signal is divided the weaker it becomes. The splitter itself creates the signal loss, it doesn't matter if the TV's are on or off or even if all of the connections on the splitter are used the loss still occurs, it's called insertion loss. The line loss that occurs getting the signal from the TV antenna to the TV or TV's can be overcome by installing a preamplifier near the TV antenna amplifying the signal before the signal loss occurs.

The degree a signal amplifier increases the signal strength is measured in decibels (dB). The higher the amplifiers dB rating is the greater the strength of the signal is increased. "Wait a minute, I know what your thinking "I'll just get the biggest high output amplifier I can get and that will solve all my problems. I have one word for you, OVERLOAD.  When too much signal is present overload can and does happen. Signal overload can occur in the amplifier, the TV tuner or both. Use the guidelines below, to select the proper amplifier for your system.

Selecting the correct TV antenna amplifier is a simple mathematical process.

Add-up the total amount of signal decibel loss that will occur as the signal travels from the TV antenna to the TV with the longest cable run. Add the signal loss from the cable length and any splitters between the antenna and the TV. Choose the amplifier with the dB gain rating that is from 5 to 10dB greater then the total loss. EXAMPLE: 100 feet of coax cable and a 2 way splitter have a signal dB loss of 8.7 dB. Also VCR's and other such devices that the signal travels through create minor signal losses. A perfect amplifier match for the above example would be the Winegard AP 8700. The 8700 amplifier has a gain rating of 19dB.  

                                     From Ask Denny

Pre-Amplifier Troubleshooting Denny, Thank you for all your help with my amplifier problems. The TV antenna amplifier I got from you was my third one and it works great. Now I know there probably wasn't anything wrong with the first two, it was how I had them installed. You should let everyone know what you taught me. Thanks Again, Robert

Robert, Excellent Idea, since 60% of all reception problems are related to Preamplifier-amplifiers. There are two parts to a mast mounted TV antenna Preamplifier-amplifier. The mast mounted portion is mounted on the mast close to the TV antenna. The power supply/injector is located indoors. The coax lead-in wire runs in and out of both parts.  The outdoor amplifier is located near the TV antenna because that is where the signal can be amplified before signal line loss occurs. The indoor power supply function is to supply electricity to the amplifier, it does this by sending it up the coax cable, the same cable that sends the TV signal down to your TV. This is where most problems occur. To transfer electricity through wire you need two conductors (wires). With coax cable the conductors are the center copper wire and the silver wire braid and shield located just under the rubber coating on the cable. The wire between the two parts can not have any interruptions in the power flow. If it does your amplifier will not work. An antenna amplifier that isn't working provides worse reception than if you had no amplifier at all. Damaged wire, signal splitters and screw on (non crimping) type cable connectors are the number one causes of amplifier failure. To test your amplifier tune your TV to a channel that has a picture, unplug the power supply from the 110v electrical outlet, the signal strength should weaken on your TV, if it doesn't chances are your amplifier isn't working. Next check your wire for damage (some wire damage occurs inside the wire and cannot be detected by examination). Next remove any signal splitters located between the power supply and the TV antenna amplifier. Next check your connections to be sure the connectors are making contact with the cable braid. If you are using screw on (non crimping) cable connectors be sure ample braid is folded back over the outside of the coax and connection to the braid is being made as you screw the connector onto the cable. Using a voltage meter you can test the coax cable at the antenna preamplifier to determine if the electricity from the indoor power supply is reaching the mast mounted preamplifier. Most power supplies have the output power indicated somewhere on the unit. If you don't have a voltage meterand the preamplifier is a Winegard unit disconnect the down lead cable at the mast mounted preamplifier. This is the cable that is connected to the TO Power connection on the preamplifier and it leads to the indoor power injector. Using a screwdriver touch the tip of the screwdriver to the center copper wire of the cable and at the same time touch the edge of the screwdriver to the connector end: See picture below. This will create a short between the center copper wire and the connector end. When this is done the red light on the indoor power injector will dim if the wire and connections are good. If the light does not dim then either the cable or the connections are bad and the electricity is not reach the preamplifier. If the electricity is not reaching the preamplifier check your connections, be certain there are no signal splitters between the mast mounted preamplifier and the indoor power supply and if necessary replace the coax cable. The electricity from the indoor power supply/injector must reach the mast mounted preamplifier.   Close this window and return to main page.