Crystal Radio with Ferrite Toroid Coil

Discussion in 'Wireless & RF Design' started by vu2nan, Jul 29, 2015.

  1. vu2nan

    Thread Starter Member

    Sep 11, 2014
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  2. DickCappels

    Moderator

    Aug 21, 2008
    2,647
    632
    Do you know what the inductance of your toroid and of what material it is made?

    Just have to note that if an antenna made of 60 feet of wire and is tuned with a fixed loading coil it isn't really of random length. It is 60 feet of wire. Yes, sometimes I am too picky at times.
     
  3. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    the main reason for using a ferite toroid in a crystal radio is size. ferite toroids have more loss than air core coils, and less "Q" (less sharp tuning) .
     
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