On a sunny day (Thu, 13 Sep 2007 05:52:36 -0700) it happened MooseFET wrote in :
Actually this gives me an idea with AND gates:
8 bits digital audio AM modulator:
D0 --------------------------- AND --- 128k --- RF -- | | D1 --------------------------- AND --- 64k --- RF -- | | D2 --------------------------- AND --- 32k ---| RF -- | | D3 --------------------------- AND --- 16k ---| RF -- | |--------||------ RF D4 --------------------------- AND --- 8k ---| RF -- | | D5 --------------------------- AND --- 4k ---| RF -- | | D6 --------------------------- AND --- 2k ---| RF -- | | D7 --------------------------- AND --- 1k --- RF --
You could perhaps replace the ANDs with RF power amps of 1, 2, 4, 8, 16, 32, 64, and 128 W, combine ouputs in some coupler, and use the data lines to switch these on.