Hi Brian, Could you give a bit more detail?
You said the 'power went off on the K2' after attempting to auto-tune the KAT100. Do you mean the DC power went dark on the K2 and the screen display went blank, or something else? Have you tried to auto-tune the KAT100 at the low power level (set K2 Power control less than 10 watts to yield 2 watt for KAT100 tune)? Have you tried connecting the KAT100 to a good 50 ohm dummy load and doing auto-tune at low and high power? Does the K2 still 'talk' to the KPA100, i.e. can you access the KPA100 menus? If so, are there any Error/Status codes displayed in the PA menu? Can you set the KAT100 to 'bypass' mode and still get low power to a dummy load on the KAT100? The fact that the 12 VDC via the PowerPoles doesn't reach the base K2 suggests that diode D9 has opened. It is also possible that a collector-base short in one of the PA transistors is pulling down the 12V line. This begs the question: what are you using for the DC power supply? Although I have my KPA100 and KAT100 outboard of my K2, I have observed situations where the KAT100 fails to continue searching for a match if the impedance seen at its output is a very bad mismatch (high SWR). In virtually all of those instances I can get the KAT100 to properly auto-tune by reducing the K2's Power control to less than 10 watts (but more than 2 watts). If you have an ohmmeter/multimeter, you can check the resistance between the PowerPoles with the 12 V power supply disconnected at the PowerPoles AND at the coaxial DC input. That resistance should be high - if not, one of the PA transistors may have shorted through. Don't forget that the KPA100 manual has troubleshooting procedures and much more detail than I've given here - see page 66 of the manual. 73, Mike, K8CN ______________________________________________________________ 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 Message delivered to [email protected]
