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any1 can guide me to FM trnsmitter Receiver for 1Km or more

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by tkhalid, Jan 5, 2003.

  1. tkhalid

    tkhalid New Member

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    hi fellows.
    is there any 1 who can guide me abt designing an FM Transmitter and Receiver for 1 km or More Range. or is there any IC which can prform the same task.
    1 thing necessary to mention is that i cant desighn the project as not in professional field. so plz treat me as a student.
    thanks to all of u.
     
  2. kinjalgp

    kinjalgp Active Member

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    The FM transmitter given in our Projects Section can be modified to increase the range. In the output power stage befor antenna you can use a power transistor like BD139 to increase the transmission power.
    WARNING: Transmitting any type of data over radio frequency band for more than 100 meters is illegal without license from FCC. So be careful before any experimentation.
     
  3. elegeek

    elegeek New Member

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    ready made boards available in the market

    hi
    u can get ready made fm transmitter boards for as cheap as rs 25
    in india,u in pakistan convert it into its equivalent.for transmitting over
    1 km u don't need to worry abt the reciever.only the current supplied to the transmitter unit is to be bothered abt.for 1 km dist 5 volts should suffice ,if the there is a direct line of transmission (straight line or else) u need to design circuits and enter into rf communication.
    hope this is of any use to u.
    bye
     
  4. dave

    Dave New Member

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  5. mechie

    mechie New Member

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    FM transmitter kit

    Take a sken at this ...
    http://www.hobbytron.net/R-FM25.html
     
  6. kinjalgp

    kinjalgp Active Member

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    RF waves are omni directional waves. The spread in all directions and not only in one direction as mentioned by elgeek.
     
  7. herbymcduff

    herbymcduff New Member

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    True that RF is omni directional, but you can control the direction with different types of antennas. Like a four element collinear array, or a six element Yagi. Those two produce a pretty staight line. It makes you wonder how they get Space wave or Direct wave propagation.
     
  8. elegeek

    elegeek New Member

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    hi
    by direct line of communication i meant no obstruction in th epath of rf waves.if there are buildings (as an eg) for the the ready made ckt i was talking abt u can't transmit it for over a km.moreever the transmission frequency must not interere with the exsisting fm transmission by the
    govt organ: fm radio.there are stringent laws used by every govt which restricts the use of rf for communication purposes.u can transmit in the citizens band.u don't need to worry abt antennas for hobby proj:.just a simple wire would do,even a bread board wire with an open end .
    if it is for a serious application which u intend commercilaising then u need to get license and lot other headaches which i am not aware of.
     
  9. Mikkel

    Mikkel New Member

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