C2 said:OK, I could not find a symbol for a forward coupler, directional coupler, leveling coupler, RF sampler...
I figured a quadrupler could just be drawn as a box with "X4" and put in filters/amplifiers as appropriate:
-[-LPF-AMP-X4-AMP(with modulator control)-BPF-]-
How would you represent the modulator (or level control)?