Note
73, Feb 1962, p. 57.
73, Nov 1963, p. 151.
The Tri-X-500 was made by Tri-State Electronics of Falls Church, Virginia. It transmitted SSB, CW, and AM on 80-10 meters. It generated sideband using a mechanical filter at 455 kHz. Power input to the 4X150A final was 500 watts SSB, 400 watts CW, and 300 watts AM.
Features
– Frequency Ranges: 3.5-4.0 MHz, 7.0-7.5 MHz, 14.0-14.5 MHz, 21.0-21.5 MHz, 28.0-28.5 MHz. 28.5-29.0 MHz, 29.0-29.5 MHz.
– Upper and lower sidebands on all ranges
– Power output control 75-500 watts
– Automatic level control
– Meter monitoring plate current and transmitter output
– Provisions for FSK
– Full time blower
– 100:1 VFO tuning
– Carrier suppression more than 50 db
– Unwanted sideband suppression more than 45 db
– Spurious frequencies down more than 45 db
– VFO Stability: 50 Hz after one-half hour warmup
– Pi network output. 45-100 Ohms
– VOX / Antitrip circuitry