Click to watch:
How QSK 2500 meets T/R Relay Timing 
Click to watch: 
Adjusting Amp delay time & Key/Paddle delay time
QSK definition
Click on picture above for: QSK 2500 User Manual 
  1. The User Manual shows how to connect the QSK 2500 to an amplifier and the transceiver. 
  2. The manual includes a detailed interface example for the AL-811H series of amplifiers.
Inside views of QSK 2500