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Indoor FM boost with no cables?
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Lostgallifreyan wrote: Hello. I've seen many 'boosters' for radio reception, none of which do what I'm hoping for, so either my aim is foolish beyond imagining, or really interesting. Please tell me which. I hope to boost the incoming signal to override the ocal RF mush from nearby flats, and to do this for a portable receiver so I want no cables attached to it at all. I have considered two possible ideas: 1. Take a feed from my existing outdoor antenna and make a dipole indoors, for passive re-radiation of whatever the outdoor one picks up. This might help a bit, depending on how good a signal your outdoor antenna gets, and on proximity between your indoor antenna and the portable receiver. 2. Same thing, but using a small preamp I built once (uses a MAR6 I think, about 22dB gain), but instead of feeding the RF input on a tuner as usual, drive a small dipole to allow any small receiver with a whip or a wire to get enough of the externally derived signal to beat the indoor mush. (I think that feedback would be a problem, with any serious power, but perhaps something as small as the MAR6-based booster I mentioned might work ok, given that the outdoor antenna is several tens of feet distant. This *might* work, but as you note it has some problems. Feedback could very well be an issue (and could be quite unpredictable as it could change from day to day or minute to minute depending on the presence or absence of signal-reflecting objects near the retransmit antenna). Also, it may not be strictly legal. Your "booster" would be, in effect, a miniature broadcast station, (re)transmitting the whole spectrum (not necessarily just the radio stations that you care about). A single-channel (re)transmitter might be legal here in the U.S. under Part 15 regulations... but boosting and transmitting everything that got into the outdoor antenna could really be problematic. You could end up making reception worse for your flat-neighbors, if the system you were boosting/repeating interfered with direct reception of the same signal. |
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