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That is the way it is supposed to work when there is a preamp between the antenna and the power supply.
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He had only the P/S installed, no amp.
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Does anyone have an idea why placing a DC power supply in-line helps with reception (without power supply no reception, with power supply over 20 channels received).
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Probably attenuates an interference, fixed an impedance mismatch, fixed a bad connection.... Dunno, shouldn't have made any difference logically.