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Shortwave Bug

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  • MultiMedia SRL
    o BSY18 can be replaced with ECG123AP. BA121 can be replaced with ECG/NTE611 (10pF@4v). USW means Ultra-Short-Wave . o L1 = 7 turns of 0.8mm Silverwire(round)
    Message 1 of 1 , Jan 31, 2003
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      Micro-Spy 2

      o BSY18 can be replaced with ECG123AP. BA121 can be replaced with ECG/NTE611 (10pF@4v). USW means 'Ultra-Short-Wave'.
      o L1 = 7 turns of 0.8mm Silverwire(round) on a 5mm round adjustable Ferrit-core. Position 'X' = 0.5 ... 1 turn.
      o This very stable oscillator has a frequency of approximately 100 Megaherz.
      o Frequency determend by the Variac BA121 and 20pF capacitor. Feedback is thru 4.7pF capacitor.
      o USW coil prevents HF signals (feedback) flow to ground.
      o DC biased with the 12K resistor.
      o Distance is from 100 to about 200 meters. Not bad for a little circuit like this!
      http://www.uoguelph.ca/~antoon/circ/circuits.htm
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