i need the circuit that will transmit and receive 2 message signals with same bandwith in same time with minimum bandwith
how can i build that i need help

 

What messages?
In what time?
Over what distance?
Over what medium?

If you want minimum bandwidth send your messages vveeeerrryyy sslllooooowwwlllyyy.

 

Messages : Information Signs giving on same time.
Distance : I'll try it on Emona Datex Kit.
Speed : Same time.
My purpose is transmit and receive 2 information signs(they have same bandwidth on same time), in minimum bandwith at same time

 

I am not much wiser.
To transmit two signals simultaneously you could use a similar method to the stereo FM broadcasts which transmit two separate channels simultaneously. For minimum bandwidth use a very low carrier frequency like 0.0001Hz. It will take a relatively long time but the times will be equal.

 

Okey, i am searching stereo FM technic. Thx for help.

 

Your information is very not useful. Are you asking about communication over wire, like a serial port, or wireless, like radio?

ak

 

The minimum bandwidth is the sum of the bandwidth of the two signals.

 

Circuit on breadboard and communication over wire.

 

Using my secret powers, I can see into the future. I see that after 47 posts we still have no idea what you want to do or why. No overall project details, no circuit requirement details, nothing. Please re-read your post #3. It says nothing useful.

Based on what you have told us so far, a simple telephone line will do what you want.

ak

 

One of the toughest part of any engineering project, no matter how small, is proper, clear, and complete specification of the requirements.
You need to work on that.

 

Borrowing (and modifying) a page from late-70's broadcast video cameras, you can use triax cable. It has one center conductor and two isolated concentric coaxial shields. The outer one is GND. The inner shield has a positive DC voltage to power the remote location circuits, plus AM or PWM one data signal. The second data signal goes down the center conductor on an FM carrier.

ak