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Thread: No Range at All.. Not Even 12 Inches...

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  1. #1
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    Question No Range at All.. Not Even 12 Inches...

    I bought this FM Transmitter that says it is 7W which it probably isn't. It still should work since 7W is wayyy too much for what I need. It was $25 on eBay and I saw it had good enough reviews. I bought it mostly because I wanted to build a transmitter myself that's pretty cheap. So far my $5 transmitter from Five Below works 5 times the range though still not good enough for my need. I need it to go from my pi in the house to the street which is about 40-50 feet for cars to listen to.

    I did try it outdoors for less interference. Still was a very short distance. The antenna you see, is 50ohms which is what they said is recommended. It's taking in 12v on a 3A power supply. It needs about 2 to function. It has a trimmer but it seem to do nothing.

    So what is going wrong? It sounds great but just does not even go 1 foot...


    VIDEO:
    https://photos.app.goo.gl/iY8FX9PJzW4yWxbx6

  2. #2
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    Default Re: No Range at All.. Not Even 12 Inches...

    7W is quite the beast!

    Is your antenna for the FM band freqs?
    ~Jason
    [URL]http://www.tooz.us[/URL]

  3. #3
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    Default Re: No Range at All.. Not Even 12 Inches...

    Quote Originally Posted by toozie21 View Post
    7W is quite the beast!

    Is your antenna for the FM band freqs?
    Not sure. It's a center coil scanner antenna.

  4. #4
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    Default Re: No Range at All.. Not Even 12 Inches...

    I would guess your antenna is the issue, here is a how-to for building your own, just make sure you follow the instruction for sizing it for your frequency

    http://www.doityourselfchristmas.com...le_antenna.pdf
    Matt

  5. #5
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    Default Re: No Range at All.. Not Even 12 Inches...

    Quote Originally Posted by Ruppro View Post
    I would guess your antenna is the issue, here is a how-to for building your own, just make sure you follow the instruction for sizing it for your frequency

    http://www.doityourselfchristmas.com...le_antenna.pdf
    Thank you. I sure needed that. I will build it and see how it works.

  6. #6
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    Default Re: No Range at All.. Not Even 12 Inches...

    Quote Originally Posted by Spankyty View Post
    I bought this FM Transmitter that says it is 7W which it probably isn't. It still should work since 7W is wayyy too much for what I need. It was $25 on eBay and I saw it had good enough reviews. I bought it mostly because I wanted to build a transmitter myself that's pretty cheap. So far my $5 transmitter from Five Below works 5 times the range though still not good enough for my need. I need it to go from my pi in the house to the street which is about 40-50 feet for cars to listen to.

    I did try it outdoors for less interference. Still was a very short distance. The antenna you see, is 50ohms which is what they said is recommended. It's taking in 12v on a 3A power supply. It needs about 2 to function. It has a trimmer but it seem to do nothing.

    So what is going wrong? It sounds great but just does not even go 1 foot...


    VIDEO:
    https://photos.app.goo.gl/iY8FX9PJzW4yWxbx6
    Can you post a link for what you purchased?
    2012 - 1st year 64 Channels - 7500 LED lights - 5 sequences
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    2014 - 201 Channels - upgrading 8 Arches to dumb RGB - 8+ sequences (1+ New)
    2015 - 240 Channels + 8 Universes - sequences TBD
    2016 - No Display
    2017 - Back in the Game - 240 Renard Channels + 12 Universes
    2018 - 256 Renard and 9 Falcon Outputs of Pixels - 16 sequences shown over 2 nights

  7. #7
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    Default Re: No Range at All.. Not Even 12 Inches...

    Quote Originally Posted by TomL8345 View Post
    Can you post a link for what you purchased?
    https://www.ebay.com/itm/5W-FM-Trans....c100005.m1851

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    Default Re: No Range at All.. Not Even 12 Inches...

    There's no telling what all blew. For 7W of output, that would be a multistage unit and there may be multiple parts blown.
    I'd return it and buy something more forgiving and more appropriate.
    In the case of a transmitter, more power does not mean better.

  9. #9
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    Default Re: No Range at All.. Not Even 12 Inches...

    Quote Originally Posted by ukewarrior View Post
    There's no telling what all blew. For 7W of output, that would be a multistage unit and there may be multiple parts blown.
    I'd return it and buy something more forgiving and more appropriate.
    In the case of a transmitter, more power does not mean better.
    Yea I'm just forgetting about that one and I bought the one Canispater has. The $5 one that's built.

  10. #10
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    Default Re: No Range at All.. Not Even 12 Inches...

    Quote Originally Posted by Spankyty View Post
    Yea I'm just forgetting about that one and I bought the one Canispater has. The $5 one that's built.
    Which one is that? Cannot find it listed in their information.. must be missing it !

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