This 4-way PTT sequencer is product designed for PTT switching from one input to 4 outputs with different (fixed) delay. You can split PTT signal to 4 independent devices with different timing: LNA, PA, RF relays etc. This device also protects your PTT output from external accessories. There is optocoupler isolator between PTT input and all four PTT outputs. Outputs are switched to ground when PTT is active. There are FET outputs without any additional delays.
PTT sequencer for LNA, PA, TRX etc.
Power supply soft start
CPU and peripheries reset
Universal (PTT) sequencer
Protecting PTT input (TRX) from accessories - opto isolators