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Lukas Fässler has designed and built an RX/TX sequencer based on a PIC16F18325, that is available on github:
Much like the beacon keyer presented here earlier, this RX/TX sequencer is a simple but useful little device. Its typical use is in ham radio applications when a separate power amplifier (PA) and/or a sensitive low-noise pre-amplifier (LNA) is used. Care has then to be take to safely transition between RX and TX states – and that’s where this sequencer comes in.
RX/TX sequencer – [Link]
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