LF WhipAmp V1 J310 and 2N2219A



LF Whip Amplifier Schematic


Whip Amplifier P1dB Measurement

  • Vcc = 12V
  • P1dB = 13.5dBm


Oscilloscope at 12dBm Output

  • Vcc = 12V
  • Ch1 Blue = AC Couple Output into 50Ω Load
  • Ch2 Red = DC Couple 2N2219A Emitter



Emitter Follower Zout with 9P Butterworth LPF

  • S21 Measurement with Zin = Zout = 50Ω
  • S21 dB Black Trace = With 47Ω series output resistor
  • Mem1 dB Green Trace = Without 47Ω series output resistor



Zero and 50Ω Zout with 100' RG58 and 530kHz 7P Elliptic LPF

  • S21 Measurement with Zin = Zout = 50Ω
  • S21 dB Black Trace = With 50Ω series output resistor
  • Mem1 dB Red Trace = Without 50Ω series output resistor