The W8EXI Wingfoot VFO Exciter
High Technology In The 1950's
by Greg Latta, AA8V

Chassis Layout

exciter top

Wingfoot VFO Exciter Pages:
Introduction and Front and Side View Photos

Power Supply, Interior, and Rear View Photos

Schematic Diagrams and Circuit Descriptions

Special Features

Block Diagram

Chassis Layout

General Information: The Wingfoot VFO Exciter is a CW transmitter of the frequency multiplying type. The VFO operates on 3500kHz and is run straight through on 80m, doubled for the 40m band, and quadrupled for the 20m band. For he 30m band the VFO operates on 3367kHz and is tripled. A final amplifier featuring variable regulated screen voltage operates straight through on all bands with an output continuously variable from 3W to 27W. A clamper tube protects the final amplifier in case of loss of bias for any reason. The transmitter features differential/timed sequence keying to provide clean, chirp free keying.

Chassis Layout
Click On A Section of the Diagram
Below for Information on That Part of the Circuit:

Chassis Layout Cathode Follower 1st. Buffer/Multiplier Oscillator 2nd. Buffer/Multiplier Voltage Regulator Final Amplifier Clamper/Screen Regulator Differential Keying

Or click on one of the links below:

Chassis Layout:
 Cathode Follower
 1st. Buffer/Multiplier
 2nd. Buffer/Multiplier
 Voltage Regulators
 Final Amplifier
 Clamper/Screen Regulator
 Differential Keying

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