QRM ELIMINATOR X-PHASE BOARD
 
The QRM Eliminator is inserted between transceiver and the antenna without any additional modifications to the radio. The unit has a built-in PTT control that must connect to transceiver which enables the QRM-Eliminator to stay connected during transmit.
An additional auxiliary receiving antenna is required, though, like a 2m antenna or simply a couple of meters wire in the shack. 
The unwanted signal is received with both antennas .
The QRM Eliminator now allows to adjust the phase angle as well as amplification in a way to cancel out the unwanted signal before it reaches the receiver front end!
 
Power supply: 12-14V
Freq: 0.5-60MHz
Auto RX-TX PTT key switch
Max power through eliminator 200w (if you are using amplifier then the eliminator contection is between transceiver and amplifier).
 
When turned off, the main antenna is directly connected to your radio, you can transmit through the unit.