I have just purchased an AL-80B with QSK board mounted. How do I hook this to my Flex 6300?
DOT NOT use some kind of buffer between the amp and the qsk board. When I was running QSK 5 boards I drove the board with the earliest TX signal I could get out of the rig. You don't want some dumb buffer slowing down the TX signal. The whole point of using this switch is to do QSK. For the flex 6k I would just use the rca plug on the back with no delays in the switching line. The board is sensitive if you try to drive it while still in receive as in you forgot to connect the RCA jack or the amp is in line but rca jack is turned off. The designer, I believe W8JI used a couple of 12v lamps as fuses in the case you are not switched to transmit. The lamps will absorb energy and light up till they blow so you can send CQ and your amp will look like a Christmas tree with the reaction of WTF??? Very cleaver idea and the receive diodes are protected. Keep some bulbs on hand I just used some from Radio Shack but I don't remember the current. The current and bulb voltage is in the QSK manual but it's not hyper-critical. If it says 75ma and you have 100ma bulbs good enough