A device for and method of combining asynchronous digital return signals from multiple nodes of a CATV return path is disclosed. The coatings of the present invention are applied by an ion beam assisted, electron beam physical vapor deposition and consist of copper and chromium particles having a diameter of about 10 nm. The combining nozzle combines the crust that is supplied by the vane pump for crusts out of the filling material that is supplied by the vane pump for filling materials.