1/10 is an average value. Earlier, all providers have encoding frequency of once per 10 seconds. A bit later, some of them changed this parameters (1/8 for example). It's normal. The most important thing is not in 1/10 or 1/8 frequency of sending/receiving keys, but how your receiver' emulator is handling them (settings). Important that it shall send requests (asks) and receive the keys in time.