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.
I hope this is helps anyone struggling with their TV antenna Preamplifier-amplifier.
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