ATD-2, bias-t, lightning protection, static bleed, surge arrestor, rf surge, greyline

Bias-T Master | DC power insertion, extraction system. Power over Coax

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DC power insertion/extraction system to power any device using the coaxial feed line. Rating: 1.5 A, Frequency range: 1.8 to 54 MHz. Includes DC power insertion unit and DC power extraction unit.


These premium quality, Bias-T Plus and Bias-T MASTER are stand-alone weatherproof units that permit the insertion or extraction of DC control signals of up to 1.5 amps on your coax cable.

By inserting the control voltage on the coax cable feed-line, you eliminate the requirement for external DC wires for powering remote devices. 

The Bias-T Plus and Bias-T Master weatherproof assembly can be placed indoors or outdoors for maximum flexibility. Typically, one Bias-T unit will be placed indoors for inserting DC on your coax feed-line, and one Bias-T MASTER will be placed at the remote device where the DC voltage is extracted.


Specifications                 Bias-T Master                                                   Bias-T Plus

Frequency Range:            1.8 - 54 MHz                                                     1.8-150 MHz

SWR:                                <1.1:1 across the full frequency range                      Same

RF Power Handling:          2.0 kW SSB/CW/RTTY                                             Same

DC voltage limit:                50 V DC maximum, positive or negative polarity     Same

DC current capability:       1.5 A maximum                                                          400 mA

DC Interface:                     2.1 mm x 5.5 mm jack                                               Same

RF Interfaces:                   SO-239 ("UHF" female) connectors (RF, RF+DC)    Same

Size:                                  4" x 4" x 2.5”                                                                Same

DC insertion and extraction units

Bias T Master System Schematic


Works well with the ATD-1 Lightning Protection Device, Auto Tuner Disconnect.