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I always knew preamps helped with signal loss in coax and distribution, but I always thought they helped amplify some of those distant, weaker signals out of the negative nm range....am I mistaken?
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You're right about the loss in coax and anything else on the output side of the amplifier... But noise at the input of any amplifier will be amplified along with the desired signal. Then even the best amplifier adds a bit of noise generated in its' components. So you loose a bit of noise margin as you go through an amplifier. If you have an amplifier with a noise figure of 3.0 dB, it's going to negatively impact net NM by 3 dB. The lower the NF, the better, because there is less added noise from the amplifier.
Passive antenna gain is the only gain that improves net NM.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 14-Aug-2013 at 2:17 AM.
Reason: example
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