Stable Vfo

Posted on Jun 2, 2012

This VFO circuit covers from 2.13 to 2.58 MHz and is intended for use with an external mixer to heterodyne the signal to desired

Stable Vfo
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frequencies. Coil data is shown in the parts list. Two power output levels are available—a few hundred mW (0 to +3 dbm) from Q3. Q4 is a class A amplifier for boosting the power to +22 dbm for driving a high-level mixer. The VFO can be operated on other frequencies, with suitable component charges (see the table).

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