VFO Model 200

The Model 200 Variable Frequency Oscillator is a fully solid state unit intended to replace the crystal functions in amateur transmitters operating in the 10 through 80 meter bands. Low drift operation is achieved by using a permeability tuned oscillator with temperature compensated components, a three stage amplifier chain following the oscillator, and an all solid state circuit for low overall temperature change during operations.

All amateur bands, 10 through 80, are covered, each with a separage dial scale. Vernier tuning with approximately a 25 to 1 ratio permits easy adjustment, quickly and accurately. Multiples of the VFO output frequency are used on the 20, 15, and 10 meter bands; on 80 and 40 meters, the output frequency is used directly. The amateur segments of each dial scale are denoted as widened lower horizontal baselines and the Novice segments as widened upper baselines.

The VFO is compatible with almost all known amateur transmitters using either grid block or cathode keying, with minor transmitter modifications necessary to insure peak and stable operation in some cases.

• Solid-state permeability tuned VFO has output on 40 and 80 meter bands
• Provides CW operation on 10 - 80 meter bands by normal frequency multiplication within the transmitter
• 5-position rotating dial indicates operating frequency on each band
• +/- 5 kHz accuracy on fundamental
• Broadband design needs only an initial adjustment to cover the entire CW spectrum
• Drift less than 100 Hz after 1/2 hour warm-up.
• 4-position switch selects Power On, Operate, Spot, and Tune
• Output RF voltage 35 V on 40 meters, 20 V on 80 meters
• Built-in AC power supply
• 4.625" x 7.25" x 7.5"

• Band Coverage (MHz)