Hi Gary: That behavior of your CMP and ALC display is a mystery. There's no reason why you should lose control over switching between those and SWR/RF in sideband mode. I believe that, once you have CMP/ALC displayed, touching any switch should return you to SWR/RF.
As with all processor-controlled gear, my first response to such a mystery is restart, reboot and reload. Restarting and rebooting are the same on the KX3, so I'd next reload the firmware. As long as the ATU reports 1:1 the SWR is not causing the high current problem. Of course, a 1:1 SWR means the transmitter output filters inside the KX3 are "seeing" a 50 ohm non-reactive match provided them by the ATU. What the antenna presents at the BNC connector isn't important when considering the KX3 current demand. The ATU is converting whatever that is to a 50 ohm non-reactive load. The efficiency of the power amplifier stage in the KX3 varies from band to band. So for a given RF output it will draw more or less current from band to band. It's possible that 12/10 might be demanding just enough additional current to trigger the HI CURR. Note, too, that for a given power output the lower the supply voltage the more current is required. So lower voltage supplies bring you closer to a HI CURR situation. 73, Ron AC7AC -----Original Message----- From: Gary Hawkins [mailto:[email protected]] Sent: Thursday, December 12, 2013 8:11 PM To: Ron D'Eau Claire; [email protected] Subject: Re: [Elecraft] [KX3] Hi Curr Warning Hi Ron, Thanks for your response but could you clarify. On the 12/10m bands I'm not sure of the VSWR of the antenna, but the VSWR reported by the ATU was 1 to 1, so basically the amp was perfectly matched and should have been OK. Now the fact that I had the radio set for 10W rather than 8W on 12/10m might be an issue if the KX3 was over driving. However, I'd made the assumption that the KX3, knowing it's band, would just limit automatically - that might not have been correct. Gary KK6GXD ______________________________________________________________ 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
