Transmission

just i like to share with you about this waves transmissions only thats meen in starting days we can see the radio thats call one way tranmission because we can hear only we can’t talk with that and midddle of the century we can see that walkitalki.that is a two way transmission but the think is we can talk at the same time thats why when we are talking this types of transmittor we always telling over over,and finaly we considered this telephone this is the one best two way transmission any time can talk together.theese are the types of this transmitters.if we want to more explanations about this section just if we compare its waves we will find out very easly.