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Quartz Crystals

Tuneable RF Oscillator

This oscillator is ideal for use up to about 15MHz when a variable frequency source is required. This could be required for variable frequency receiver local oscillator circuits in receivers. To improve stability at higher frequencies it is adviseable to wind L1 on a ferrite ring.

The tuned circuit may be replaced by a crystal and the circuit will oscillate at the fundamental frequency only. If used as a VFO then the mechanical construction of the oscillator should be very solid. Use laquer or even wax on the coil to prevent microphony

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