Chapter 11

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Building a VFO for the higher bands (PMOs)

  • Old approaches that no longer work

Frequency multiplication
High frequency oscillators

  • Pre-Mix Oscillator method of frequency translation
  • A VFO-controlled QRP module
  • Crystal oscillators are stable, aren’t they?

Crystal oscillator circuits
Butler oscillators and big crystals

  • Mixers, bipolar transistor and dual-gate MOSFET

Optimum drive requirements
Direction of tuning, drift error cancellation

  • Multistage filters and filter/amplifiers
  • The QRP final amplifier stages
  • Spot switches for PMO QRPs6