Thank you Flex Radio for an easy Plug N Play interface with my Amp ... (PRAISE)
The interface with the 6400M series to my KPA500 went flawlessly ...
Totally plug and play. Plugged key cable from TX1 jack to Key input on Amp. Set 20 ms delay in the RCA TX1: Box where 0 was and Set TX1 Enabled and all others RCA TX2-RCA TX3 as Disabled. Saved with word Amp in transmit profile after setting power levels on all bands to 30 watts which gives me 480 watts out but 35 will do 560 watts, the amp doesn't even flinch, actually it will do up to 640 watts without complaining.
Best amp I every owned. Yes its expensive but you get what you pay for (PRAISE - Isnt that why you bought Flex Radio) and this amp was worth every penny I paid for it, oh and did I mention it has the power supply internal, runs off 120vac and draws about 9-10 amps full power according to my Kill-A-Watt device its plugged into, and its small about 6" tall, 13" wide and 9 or so inches deep but does weigh 26 pounds so you need a stout rack or place to put it.
Never misses a QSO either cause its fully ready to go in less than 20 seconds from turn on.