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Why 50%?first square wave with 2 Hz period, 50 % duty cycle,
1) buy a signal generator with burst function.
2) use a dds chip
3) use an fpga with a DAC and create your own dds.
4) use a 3KHz oscillator and a fet switch to gate a 27MHz oscillator.
5) etc., etc.
Just go the usual way: use a switch.dont know how to switch the signal on and offf??