When you start transmitting, the KAT500 detects high SWR and interrupts the amplifier key line as a prelude to tuning. However that takes a little time. In the time that it takes the KAT500 to break the amp key line, the KPA500 may observe high SWR briefly. It engages its attenuator and flickers the Fault LED (but this is not a fault that requires reset). If the high SWR persists, the KPA500 will fault. But the KAT500 should break the amplifier key line promptly, before the KPA500 faults, if it is allowed to do so.
I suspect you may not have configured the KAT500 to break the amplifier key line when transmitting. In the KAT500 Utility, Configuration Tab, Edit Configuration, Amplifier Key Interrupt Power, click the button that says "optimize for KPA500". Some amplifiers, particularly those with frame relays, cannot tolerate having the amplifier key line hotswitched with RF present. So the KAT500 has to wait for a pause in transmission before it can interrupt the amp key line. 73 de Dick, K6KR -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bill Wiehe Sent: Saturday, March 16, 2013 7:31 PM To: [email protected] Subject: [Elecraft] K3, KPA500, KAT500 interactiions I must be having a senior moment so bear with me. If the KPA500 is "not keyed" (K6KR) and/or it is "inhibited" (AC7AC) while the KAT500 is tuning, why am I getting a "fault" that requires a manual reset? BTW I am using the cabling as described in figure 1 on page 4 in the KAT500 owners manual with the correct DB15 cables and, in the interest of full disclosure, I do use the KPAK3AUX Y cable at the K3 ACC port. Bill - W0BBI ______________________________________________________________ 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 ______________________________________________________________ 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
