AM Transmitter

Discussion in 'The Projects Forum' started by Nathan Hale, Nov 24, 2011.

  1. Nathan Hale

    Thread Starter Active Member

    Oct 28, 2011
    125
    2
  2. wayneh

    Expert

    Sep 9, 2010
    12,087
    3,027
    You may be interested in the completed project I posted recently on this topic.

    You don't need a license for that design because the power and range are so small. But, there are rules. I've forgotten where the line is drawn, but it's not much more than this. If you start optimizing, amplifying, etc., then you'd better look into it.
     
    Nathan Hale likes this.
  3. DickCappels

    Moderator

    Aug 21, 2008
    2,647
    632
    No, you don't need a license -or more correctly, that transmitter probably could not qualify for a license on that band on technical grounds. It may not qualify for unlicensed operation if the emissions out of band turn out to be too high.

    But don't worry, if you don't connect it to a monster antenna, most likely nobody will hear you (except maybe your neighbors would be annoyed by interference on their television screens).

    For reference, in the United States, you are allowed up to 100 milliwatts input to the transmitter's final stage and a single element antenna up to 3 meters long. There are other requirements, such as the signal remaining within the broadcast band.

    You can read the details yourself at the URL below.
    http://www.hallikainen.com/FccRules/2012/15/221/

    Also at
    http://law.justia.com/cfr/title47/47-1.0.1.1.12.3.236.13.html
     
    Nathan Hale likes this.
  4. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    If there is a need for a licence depends on the country you live in.
    Most countries have the ISM bands to use for communication:
    http://en.wikipedia.org/wiki/ISM_band

    Bertus
     
    Nathan Hale likes this.
Loading...