Transcription of Variable Frequency Oscillators (VFOs)
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Variable Frequency Oscillators (VFOs)
1. Chapter 10, Harris CRYSTAL SETS TO SIDEBAND. Frank W. Harris 2010, REV 12. Chapter 10. Variable Frequency Oscillators (VFOs). Sooner or later you'll become frustrated with being stuck on a few crystal-controlled frequencies. You would like to have a Frequency -tuning knob that covers the entire band and not just a few kilohertz. This sounds simple, but isn't. It's difficult because, without the stability of a crystal, an ordinary RF oscillator will drift hundreds of hertz while you're sending. The fellow you're talking to probably has a modern transceiver with a narrow, stable passband. From his perspective your signal quickly drifts out of his passband.
For HF transmitters running on 160 meters (1.8 to 2.0 MHz) or on 80 meters (3.5 to 4.0 MHz), it’s practical to build a VFO for those frequencies. Then you may amplify the VFO signal directly. For example, if you had a crystal controlled QRP designed for 80 meters, an 80 meter VFO could be plugged directly into the crystal socket.
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