Good day/eve to everyone.

I want to make a simple 850 or 900 mhz signal booster/repeater that i would like to attach to my yagi antenna.
Is there anyone here who can give me a simple diagram? Also I want to develop my skills in electronics by understanding how it works.

Thanks in advance for someone who could help.

 

In that frequency range there is nothing simple about the design, fabrication, or construction of circuits. The test equipment for working with circuits in that frequency range costs as much as a small house.

To get started you might want to learn about stripline design.

http://www.microwaves101.com/encyclopedias/stripline