I've often heard that the output impedance is 50Ω, and the load impedance should be matched to that and also 50Ω. While the reasons for the load impedance to be 50Ω are clear, is the output impedance really 50Ω and if so why?

Wouldn't this mean a large amount of power is lost in the transmitter? Wouldn't it mean SWR losses would be much higher than they actually are?

I've often heard that the output impedance is 50Ω, and the load impedance should be matched to that and also 50Ω. While the reasons for the load impedance to be 50Ω are clear, is the output impedance really 50Ω and if so why? If it isn't 50Ω, what is it?

Wouldn't this mean a large amount of power is lost in the transmitter? Wouldn't it mean SWR losses would be much higher than they actually are?