B-310-G B310G Original Mirage Communications Equipment 144-148 MHz VHF Amplifiers B-310-G amplifiers are fully SWR protected to prevent damage from a mobile antenna whipping around in the wind. Also, Reverse Polarity Protection can save your amp if you accidentally connect the power backwards. These amps are compact but powerful and feature Mirage's custom "wrap-around" heat sink to provide excellent heat distribution so they run cool for extra-long life. Fully equipped, Mirage B-310-G Amplifiers feature LED indicators and Automatic RF Sense Transmit/Receive switching, or you can use their remote keying jack. These amplifiers include a 3 foot coax cable, mobile bracket and rubber mounting feet, and are backed by a full one-year Mirage warranty. With Mirage's legendary ruggedness, you may never need their superb warranty. A built-in low noise GaAsFET receive preamp gives you 15 dB gain -- lets you dig out weak signals. SWR Protection prevents damage from antennas whipping in the wind. Reverse Polarity Protection can save your amp if you connect power backwards. Automatic RF sense Transmit/Receive switch. Remote keying jack. LEDs monitor "On Air", high SWR, pre-amp, power. Push buttons select SSB/FM, pre-amp, power. Draws 15 Amps at 12-15 VDC.