Gary,I didn't find the table, but I did find two relevant posts: This was the problem reported by one poster: >>During xmit at modest power 8 - 9 watts, I occasionally see a msg flash on >>the display that shows "hi curr". It seems that when that happens, the xmit >>power gets reset to 5.0 watts. I have the battery charger option installed >>and NiMH batteries in the unit, but have been running from an external 12v >>gel cell.Sounds quite similar to your experience. There was a response from >>Myron, WV0H, who has done considerable testing on his KX3:>>8-9V will allow >>you 3W on any band.>>9-11V will allow you 5W on any band.>>11-13V will allow >>you 10W on 160-15m, 8W on 12-6m, and HI CURR if you exceed 2.5A.>>13-15V will >>allow you 12W on 160-15m and HI CURR if you exceed 3.0A, or if on 12-6m HI >>CURR if you exceed 2.5A. >>If the HI CURR warning shows up, expect to see the power setting throttled back.I have tested some of these data points and my results are very similar to Myron's. In addition, I took a look at some SLA datasheets, and would be very surprised if the voltage at the KX3 during transmit stays above 11v for long. The discharge curve (NOT the same thing as the resting curve, or the charge curve) for SLA's is pretty steep. Combine that with the relatively high internal resistance of the cells, cable/connector drop, and the KX3's reverse polarity protection, and the voltage at the KX3's Power Amplifier tends to get knocked down a lot. I ran successfully ran SLA's for a while after receiving my KX3, but only at 5w and below.I suspect your decision to move to Lifepo/Lipo cells is the right answer if you want to stay in the 8-10 watt range. There are lots of folks using them successfully for that reason.MarkKE6BBFrom: Gary [email protected]>Sent: Fri, Dec 13, 2013 at 9:04 AMTo: Mark Petiford [email protected]>; [email protected] [email protected]>Subject: Re: [Elecraft] [KX3] Hi Curr WarningHi Mark,I have revision C2 of the manual and, if I remember correctly, theimportant power voltage setting is >11V for full power. Thatbeing said, if 13.8V is what is required this may explain what'sgoing on. The SLA nominal voltage is marginal. I'm going topurchase some Lifepo/Lipo batteries to both reduce weight in packand provide a slightly higher nominal voltage. I'm not a member of the Yahoo KX3 user group - perhaps I shouldjoin. If you do find the table you referenced I'd love to see it.Best regards,Gary ______________________________________________________________ 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
