Variable Frequency Oscillators (VFOs)
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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