Jack,
That for taking the time for your detailed reply. It seems there is some risk that a fully integrated K3, KAT500, and KPA500 could experience a power spike for the scenario I proposed. Up to this morning I had been opening the KAT500 key line anytime my TS-590 was set to 40 W or more regardless of KPA500 mode. This is the pro-active overdrive protection I had previously told you about. With that implementation I saw a 600 W power spike when I selected OPER during an FT8 transmission with 37 W set for STBY but 8 W set as OPER band power. My setting of OPER band power will be much slower than the K3 response to the Aux bus signal. This morning I changed my controller code so KAT500 key line is always open when KPA500 is STBY. When I see KPA500 change to OPER I wait a second to allow OPER band power to be set and then enable the KAT500 key line. This greatly reduces the risk of a power spike at the STBY to OPER transition. Here is the diagnostic output for the transition 37 W STBY to 8 W OPER: 2:39:22.997 New KPA_mode - ^OS1; 2:39:22.998 STBY_OPER_time set 2:39:23.145 Sending PC008; to Kenwood 2:39:23.388 New PC - PC008; 2:39:23.999 power_prot_limit=40 2:39:24.000 Power protection cleared 2:39:24.001 KEN power verified 2:39:24.003 Sending AMPI0; to KAT500 2:39:24.062 New AMPI - AMPI0; My power management code is not all that complex but it has taken a while to understand and accommodate the various "corner cases". Your willingness to share your insights has been helpful. 73, Andy, k3wyc ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
