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transmitter antenna

Discussion in 'General Electronics Discussion' started by IZICO, Mar 11, 2011.

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  1. IZICO

    IZICO

    3
    0
    Mar 11, 2011
    does a low frequency(10- 25) MHz transmitter antenna has to be very long, say (30-12)meter
     
  2. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    Anything which conducts can be coupled at any frequency, the efficiency may be very low however. For a simple aerial, it is usual to drive a half wave at the centre. At 14MHz, the aerial will be about 10m long and will show a drive resistance of about 50 ohms which modern amateur radio transmitters are designed for.
    Longer or more complex aerials can provide directivity (more signal) but may need matching circuitry. Many persons have spent many years playing with the design of aerials and there are computer programs (I use MMANA) to try them out without climbing trees!
     
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