Poodle crossbreed the words "Labradoodle" (poodle−Labrador retriever cross), "Poochon" (Bichon Frise-Poodle cross) and "cockapoo" (poodle−cocker spaniel cross) are now listed in the "Oxford English Dictionary". There were over 220 hybrid designer dogs recognized by the American Canine Hybrid Club in 2006 and now, including various poodle crossbreeds. Legitimate breed associations, such as the AKC, the UKC, and the CKC, do not recognize this crossbreed, or any other designer cross, as a breed in its own right. However, some major kennel clubs do accept registration of crossbreed and mixed-breed dogs for performance events such as agility and obedience. There is another registry, the
Low frequency can be received up to from the transmitting antenna. Low frequency waves can also occasionally travel long distances by reflecting from the ionosphere (the actual mechanism is one of refraction), although this method, called "skywave" or "skip" propagation, is not as common as at higher frequencies. Reflection occurs at the ionospheric E layer or F layers. Skywave signals can be detected at distances exceeding from the transmitting antenna. In Europe and Japan, many low-cost consumer devices have since the late 1980s contained radio clocks with an LF receiver for these signals. Since these frequencies propagate by ground wave only, the