Function and purpose QRM Canceller is inserted into the antenna feeder to cancel unwanted signals before they reach the receiver front end, improving reception by reducing interference from QRM. The system works with your existing radio setup without requiring any modifications to the radio itself. How it works Two antennas pick up signals with potentially different phases. The QRM Canceller, placed in the antenna feeder, lets you adjust the phase angle and amplification of the cancellation path to reduce the unwanted signal before it enters the receiver. Easy integration and compatibility No changes to your radio are needed; simply insert the unit into the antenna feeder as part of your existing antenna system. The device relies on an auxiliary receiving antenna to complete the cancellation path. Recommended options include a dedicated 2 meter receiving antenna or several meters of wire placed in a shed or similar location. Builtin features The enclosure includes a builtin PTT control to keep the canceller connected during transmission, ensuring continuous cancellation performance without extra setup. Key benefits and performance Reduces local interference and improves signal clarity on weaksignal or crowdedband environments. Adjustable phase and gain allow you to tailor cancellation to your specific installation and local QRM conditions. Maintains compatibility with your existing equipment and workflows, with minimal setup effort. Practical use scenarios Home shack with multiple antennas: Install the canceller in the feeder to suppress nearby interference from adjacent systems while using your usual receive/transmit setup, improving copy on weak stations. Portable or temporary field setups: Use a short auxiliary receiving antenna (such as a 2 m antenna or a few meters of wire in a shed) to enable effective QRM cancellation in environments with local noise sources. Contest or denseband operation near noise sources: Deploy the canceller to reduce local QRM, helping you maintain readability and timeontask during activity periods. What you get and how it helps you A dedicated QRM cancellation unit designed to integrate with standard antenna feeders without radio modifications. Builtin PTT control for seamless operation during transmission. Clear guidance on using an auxiliary receiving antenna to complete the cancellation path for improved reception quality.