Drake TR4 Transceiver

Modes

SSB (upper or lower sideband), CW, and AM. Reference

RF output power

SSB: 300 watts P.E.P. input power; CW: 260 watts power input; AM: 260 watts P.E.P. input, with 50 watts output at maximum modulation. Reference

Audio output power

2 watts. Reference

Power requirement

650 VDC at 300 mA average and 500 mA maximum; 250 VDC at 175 mA; −45 to −65 VDC adjustable filtered bias into a 33 kΩ load; 12.6 VAC or DC at 5.5 A. Reference

Frequency stability

Overall drift less than 100 cycles after warm-up, and less than 100 cycles for a ±10% line-voltage change. Reference

Frequency resolution

10 kHz divisions on the main tuning dial and 1 kHz on the tuning-knob skirt. Reference

Dimensions

5 1/2 inches high × 10 3/4 inches wide × 14 3/8 inches deep. Reference

Weight

16 lb. Reference

Antenna impedance

Nominal 50 ohms. Reference

Antenna connector

SO-239 coax connector. Reference

Sensitivity

Less than 1/2 microvolt for 10 dB S+N/N. Reference

Specifications may vary by revision or market. Use linked manufacturer references when available and confirm critical details before purchase.