The internal fuse and reverse polarity protection diodes that protects the K3 does NOT protect the KPA3, so you probably blew the KPA3 finals and will need replacements.
In the meantime, you can run the K3 at 10 watts. When you increase power beyond about 12 watts, the KPA3 switches on putting a dead short on the +12V line. The K3 jumps up to full drive because it's trying to get 100 watts out of a dead KPA3. Remember, the K3 POWER control "requests" a power level from the rig, and then increases power until the power monitoring circuit at the output agrees that the requested power is being delivered. 73, Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of David Eckert Sent: Sunday, August 11, 2013 3:54 PM To: [email protected] Subject: [Elecraft] question hi current/kpa out of control I really screwed up and reversed polarity to the dc power supply turned on power supply but NOT radio surge in current then 20 amp breaker in k3 poped I reset it amazingly k3 still works but something is wrong with the KPA3 or the PAI/O controller gives hi current if try to bring power above 12 w will drive KPA 500 to about 200 w with 12w if you try to increase power beyond 12 w hi current displays and KPA 500 is quickly overdriven as if the KPA3 is out of control increasing power in large increments (KPA500 is usually driven at about 20 w) is this a computer glitch i can fix or do i need a new KPA3 or PA I/O module? Dave KB8V ______________________________________________________________ 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
