Hi.
Firstly your English is very good compared to some.
You would get more help if you described your full project also if you filled in your location as it helps members to decide the best components for you e.g. Availability in your country.
Also I know that double posting is frowned upon but a lot of the members do not read postings with help needed etc as a title. In your title give a better description of what you need.
e.g. RF micro transmitter, receiver and demodulator. help
OK sorry I can't help more but other members will try if you are patient and change your posting title. If you do repost with a new title do apologise for the duplicate post.
Best wishes.