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This review is from: TERK XM 18dB In-Line Amplifier for XM6 Antenna
Pros: 18 dB of gain. Probably, a wall transformer injects DC voltage onto the transmission line (cable) to power the amplifier.
The quality of an amplifier determines how much distortion it will add to the system. It is good of audiovox to specify that only two of these amplifiers, maximum, should be cascaded.
Cons: 1) There's nothing in the description that mentions how the amplifier gets DC power. The picture doesn't show a power supply.
2) The description gives bad instructions for amplifier placement. If the signal is going to suffer 18 dB of attenuation when it goes through the cable, use this amplifier BEFORE the attenuation.
Know how many feet of cable you're going to use, and what type of cable it is. Use google to see how many dB of loss the cable is going to reduce your signal by. (Cables are specified in "dB loss per 100 (or 1000) feet.") If the attenuation in your cable-run is up to 18 dB, this amplifier will compensate for the cable loss. If the attenuation will be more than 18 dB, splice in a 2nd amplifier at the 18 dB point.
Other Thoughts: The description says:
> Up to two amplifiers can be used in one cable run. Install [one] amplifier after each 100 feet of cable. (Punctuation added.)
The first amplifier should go as close to the antenna as possible, with as few inches of transmission line as possible between the antenna and the first amplifier.
The second amplifier should follow 100 feet after that (or more-accurately 18 dB after that), if you need to go further.
If a weak signal has been attenuated by a long run of cable, it becomes buried in the noise, and no amplifier can bring the signal back. You want to amplify the signal BEFORE it is attenuated by a long run of cable. That will keep the signal above the noise even by the time it reaches the far end of the cable length. At the far end, the signal will still be strong enough for your receiver-input or another stage of amplification.
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