Colpitt On/Off keying modulation

Discussion in 'The Projects Forum' started by KCHARROIS, Jul 9, 2012.

  1. KCHARROIS

    Thread Starter Member

    Jun 29, 2012
    292
    1
    Hello
    I currently have a colpitts oscillator working at 2 Mhz and I'm now trying to modulate On/Off keying any ideas?
    Thanks
     
  2. mcasale

    Member

    Jul 18, 2011
    210
    12
    Not sure what you are trying to do. Is this a Morse code thing?

    Is this a TTL compatible signal level?

    You should be able to run the signal into a logic gate and enable/disable the other gate input.
     
  3. KCHARROIS

    Thread Starter Member

    Jun 29, 2012
    292
    1
    Yes just like Morris code but sending pulses with a square wave.
     
  4. PaulEE

    Member

    Dec 23, 2011
    423
    32
    Shunt the input to the transmitter with a '4066 quad bilateral switch or FET or BJT to modulate the data...I assume the baud rate is slow enough such that a brief RC-like delay due to switching won't ruin the operation...if so, buffer the shunting device a bit more to eliminate that RC-effect/lack of current. Ya dig?
     
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