Short Circuit and Inductance

Discussion in 'General Electronics Chat' started by Mazaag, Aug 20, 2009.

  1. Mazaag

    Thread Starter Senior Member

    Oct 23, 2004
    Hey guys,

    I have a circuit which is driving me nuts. It's got a spiral antenna which is picking up a 4MHz signal from a transmitter. The output from the reciever antenna then goes through a diode and a cap.. I'm measuring the output across the cap.. Now, when I short circuit the output with a short wire (5cm) and the output changes.. But when I use a longer wire, NOTHING HAPPENS.. it's so weird.. I thought that maybe the long wire acts as an inductor, with the impedance increasing to almost an open circuit (cause of the 4MHz) but then it's rectified so I'm lost.. Any thoughts ?

    Thanks guys
  2. Wendy


    Mar 24, 2008
    Antennas themselves are tuned circuits. Sounds like you're detuning the whole setup.