A new line of bi-phase modulators covering broad octave frequency bands from 0.5 to 40 GHz, use TTL logic to phase modulate data onto an RF carrier signal using 2 phase shift keying (2PSK). Useful applications include military and commercial communications systems, microwave radio, radar, high-data-rate test & measurement, serial data transmission, and wireless base station infrastructure. These 0 to 180° bi-phase modulators include nine models that offer impressive performance, including low insertion loss of 2.5 dB typical, fast switching speed of 40 nsec typical, low VSWR of 1.8:1 typical, and maximum peak RF input power of 0.5W. These compact and rugged packages utilize solder pins for TTL control, DC bias and ground, and field replaceable SMA or 2.92mm female connectors. They operate across a wide temperature range from -40 to +85°C, All models are highly reliable, meeting MIL-STD-202 environmental test conditions for humidity, shock, vibration, altitude and temperature cycle.