Chapter 15

PDF DOWNLOAD: Chapter 15


  • It can’t be that hard! Want to bet?8.
  • The sideband generator – how it works

The 9 MHz oscillator / amplifier
The audio amplifier
The balanced modulator
Building your own crystal ladder filter
Decoupling the power supply leads
Getting rid of RF feedback – RF filtering for all inputs

  • Tuning and testing
  • Using the generator for AM modulation and CW
  • Moving the 9 MHz SSB signal to a hamband

Move the SSB only once!

  • No wonder most ham rigs are transceivers
  • Moving the 9 MHz signal to the difficult HF hambands

Move the VFO first, then mix it with the SSB 9 MHz.
Pick your oscillator and VFO frequencies carefully
Hearing your own VFO in the receiver
The hardest band – 17 meters
40 meters and 12 meters
Covering the widest band – 10 meters

  • A linear sideband QRP, VFO-tuned module

All stages must be linear and low distortion
All gain stages should be broadband to prevent oscillation
Sometimes high pass filter output is needed and not the usual low pass
Checking out the generator

  • Driving a 50 watt linear amplifier