Have you tried an external wattmeter to check for power output?
When you make your tests, have you looked at the current draw (use the internal current measuring capability)? What is the current with the rig set to high power (100W) and low power (10W)? Have you checked the hardware on the low power amplifier (motherboard and bottom cover)? Question 1 is an attempt to determine if the internal wattmeter has failed. Question 2 is an attempt to determine if the 8.12 MHz (IF) trap has opened. Question 3 leads to the possibility that the pre-driver has failed because of insufficient heat sinking (loose hardware). If your rig started life as a 10W radio and you have the PA jumper board, I would also recommend removing the KPA3/switching board and installing the jumper to conduct low power tests. Beyond this, I suspect you should be contacting [email protected] to arrange for factory support/return for diagnosis/repair. 73, ... Joe, W4TV On 7/27/2016 9:29 AM, Chris Kimball wrote:
Thanks for the comments. The rig is NOT in the TEST mode, that is, the display TX is not flashing. Holding the TEST mode produces informative messages in the VFO B area both on turn on and turn off. I'm not certain that the TEST mode produces ANY indication at all in the RF scale. I've bypassed both the KPAT and KAT and set the power to 10W. Into a dummy load I still get just one segment in the RF output, the segment being about twice the width of the end tick on the RF scale. There is a distinctive click in going below 13W output. The rig has only 1 receiver and that receiver has the general coverage option. I've tried operating on 80, 40, and 20m with the same no-output result. Just reloaded the latest firmware with K3 Utility. No change in RF output, unfortunately. -- View this message in context: http://elecraft.365791.n2.nabble.com/Power-has-disappeared-tp7620735p7620752.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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]
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