Features 1.Easy to Use: Aluminum alloy QRM eliminator is inserted from the Transsmite Receive Unit into the antenna feedline without any other modifications to the radio. 2.Adjustment: Aluminum alloy signal canceller now allows adjustment of phase angle and amplification to eliminate unwanted signals before they arrive the front of the receiver. 3.Built in PTT Control: The aluminum alloy QRM eliminator has a built in PTT control that keeps the canceller connected during transmission. 4.Auxiliary Antenna: The QRM eliminator requires an additional auxiliary receiving antenna, such as a 2m/6.6ft antenna or a few meters of wire in a shed. The two antennas receive unwanted signals, resulting in different phases. 5.Wide Compatibility: The QRM eliminator contains the interface circuitry needed to work with most modern HF transceivers and is widely available. specificationItem Type: QRM Eliminator Material: Aluminum Alloy, PCB Impedance: 50 Frequency Range: 1.8MHZ-30MHZ Maximum Transmitting Power: 100W Sound Interface: RCA (Can Be Connected to PTT) Power Connector: 5.5x2.1mm Power Supply Power Supply Voltage: DC 13.8V 150mA PackageList 1 xQRMEliminator 3 x Antenna Adapter 1 x Antenna Line 1 x RCA Cable 1 x Power Cord