What is a 3rd method SSB transmitter?

Answer 1

not shure, ssb is, Single Side Band, but I am not shure about third method though.

Answer 2

tradition has it that 3 methods can be employed to generate a single sideband without carrier.

#1 is comon AM modulation followed by a filter that eliminates the carrier and undesired sideband. This is sort of a "brute force" method.

#2 is called phasing. The modulating audio is advance/retarded by a 90 degree phase shift, am modulated with carrier that has also been phase shifted and upon combination, the carrier rf cancels and one of the sideband cancels as well. it is hard to get sufficiently accurate 90 degree phase shift at audio frequencies for this to work well. It is of historical interest only in that it was the easiest way to convert convential AM transmitters to SSB service.

#3 is to simultaneous modulate AM and FM with sychronous carriers. In AM both sidebands have a positive correlation. In FM the sidebands have a negative correlation with each other. By applying a 180 shift to one of the modulated results, the AM and FM when combined will cancel both the carrier and one of the sidebands. this can be done at high power level which gives it an advantage over method 1 and does not require phase shifted audio as in method 2.