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Low Power FM Transmitter?

Discussion in 'Electronic Repair' started by Ralph D., Feb 15, 2006.

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  1. Ralph D.

    Ralph D. Guest


    I am aware this may not be the most correct group for this question, but
    there are often some here who may know the answer.

    I would like to transmit an FM signal at, say, the 88 end of the dial at a
    power just strong enough to get around an acre or three out here in the
    country. I don't know what the power regulations are (and don't care too
    much as there aren't many folks around) but so long as I can listen to the
    signal on an FM radio nearby I'd be happy.

    Is there a transmitter available for cheap such as a HAM unit of some sort
    that maybe can cross over slightly or something? I know that FM radio is in
    the middle of the TV band, but is there room there that is used by some
    other communication that I could maybe run without an antenna so as to not
    walk the signal further than right here?

    Does a poorly tuned FM transmitter throw harmonics like AM does?

    If you had an FM signal to get out around home, how would you do it?
  2. Don Bowey

    Don Bowey Guest

    There are no ham bands around the 88-108 band, so there are no ham thingys
    that will work.

    You don't want to mess around the frequencies above 108MHz, as that¹s the
    aircraft band and you could easily interfere with directional signals (VOR).

    There are gadgets being sold that do what you want. They are called FM RF
    Modulators. Google that and you will get leads to sellers. It is best to
    buy one that meets the FCC requirements.

  3. Ralph D.

    Ralph D. Guest

    YIPES! I'm right under the backup approach of the local airport... so that
    might be a *really* bad thing here. :-o

    Combined with Car Audio and such, there are so many of those new ipod
    transmitter gizmos out there now that searches turn up 300,000 hits... and I
    need something considerable stronger than one of those (have one... tried
    it... works great in the house only... but it eats batteries, hums with
    cigarette lighter adapter and doesn't reach the driveway let alone across
    the fields).

    I'll sit down later and see if I can find a way to narrow the search
    parameters so as to exclude some of those.

    Thanks for at least getting me started!
  4. Ralph D.

    Ralph D. Guest

    Thanks. I have not done any PCB soldering since High School Electronics
    Class some 32 years ago... but likely still have the stuff I need in my
    Dad's workshop. Can't say I'd be comfortable doing it now, though, even with
    having built many computers it's not the same skillset.

    Built ones seem to be going for 50 to 100 beans US over kit price, which
    seems a little pricey for what I want to do (get a signal from here to the
    barn and such). I've not done anything with HAM or other radio in the same
    span, but maybe I need to get the greymatter flowing on who some of the 1st
    and 2nd class guys were in the area and see if they have any leads on one
    with a locked frequency used.

    Thanks again.
  5. Guest

    I have fooled around with the simple one chip stereo transmitters. I
    was getting
    almost 1000 feet with a slightly longer antenna than recommended, but
    was noiisey this distance, and tended to follow the power poles. With
    the recommend
    antenna, these are legal.

  6. GregS

    GregS Guest

    The devices sold to convert to stereo car radio may be signal limited.
    I have also have one that attaches to the car radio antenna. The signal must be attenuated
    in that case. The others may have too short of an antenna system.
    The stereocaster, $29.95, is the one I have fooled with. Getting the input gain set was the main

  7. spudnuty

    spudnuty Guest

    Are you trying to broadcast your own music around the farm? I've built
    Harry's stuff:
    I've got it around here somewhere. It worked pretty well.
  8. James Sweet

    James Sweet Guest

    I have a Ramsey FM-25B which works very well, though it's a bit pricey.
    I built it from a kit but it was not difficult, they may offer an
    assembled one too.
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