The W8EXI Wingfoot VFO Exciter
Oscillator Schematic Diagram and Circuit Description:

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Oscillator

Click here for a higher resolution (larger) schematic.

Click here for a rotated schematic more suitable for printing.

Oscillator Grid Circuit

Click here for a higher resolution (larger) schematic.

The grid box is nothing more than a series LC circuit mounted in a separate housing that is connected to the oscillator on the main chassis through a pair of RG-58 coaxial cables. The shield of each cable is grounded on each end and the center conductors are connected as shown in the schematics. The length of the cables is not critical. The cables can be several feet long if neccessary, but should be as short as possible. By having the LC circuit on a separate chassis, thermal drift is essentially eliminated, making the oscillator as stable as modern synthesized gear.

This page is under construction.
The circuit description will follow at a later date.

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If you have any questions or comments, you can send E-Mail to Dr. Greg Latta at glatta@frostburg.edu