QRM Box - Aluminum Alloy 1-30MHz QRM Noise Canceller with PTT Control, Knob Pointer & Dial for Ham Radio, Telecommunications | Perfect for Radio Stations, Emergency Communications & Signal Clarity Enhancement

Feature:1. The QRM canceller allows adjustment of the phase angle and gain to cancel unwanted signals before they arrive at the front end of the receiver.2. Built-in PTT control, the built-in PTT control can keep the connection status of the canceller during the transmission.3. Very convenient, the QRM is inserted into the feedline without any additional modifications required to the radio.4. With dial and knob pointer, the has a dial and a knob pointer, and the phase can be adjusted through the knob.5. Made of high quality aluminum alloy shell design, strong and wear‑resistant, can provide a long service life, with excellent performance.How to Use:The QRM canceller is inserted into the feeder of the antenna from the without any other modifications to the radio. The box has a built‑in PTT control to keep the canceller connected during transmission. However, an additional auxiliary receiving antenna is required, such as a 2m antenna or only a few meters of wires in a shed. The two antennas receive unwanted signals, resulting in different phases. The QRM canceller now allows adjustment of the phase angle and amplification to cancel the unwanted signal before it reaches the receiver front end. It is based on a completely innovative concept and cannot be compared with the norm