Bias-T with Attenuator and PTT control

The HamTEK Bias-T with attenuator and PTT control is designed for use with active antenna systems or any system where a switched bias-T power source is required to protect sensitive receivers from high RF field strengths produced by TX antennas. When an active RX antenna is used in proximity to a high-power TX antenna, the field strength is often high enough to overload the pre-amplifier and damage the circuitry. The BTS-0001 allows the active antenna power to be switched off while transmitting, thereby protecting the sensitive pre-amplifier. A variable attenuator is included to reduce the amplified RX signal and calibrate the levels for a correct S-meter reading.

Key Features

• Wide variable attenuation range of 4dB to better than 50dB
• Wide frequency range of 50KHz to 75MHz
• High maximum bias-T current (0.5A) for the most demanding applications
• Solid state switching for high speed and reliability
• Filtered power supply input to prevent PSU noise from entering the system
• All inputs are reverse polarity protected with automatic resetting fuses and are fully protected against static discharge and surges
• Double pole power switch to fully isolate PSU from RF connectors when switched off
• Fully protected against bias-T current overload with fold back protection
• Under-voltage protection to prevent low bias-T voltages