On 1/9/2025 3:22 PM, JOHN LAWRENCE via Elecraft wrote:
I’ve used my K3 to drive my smaller external amplifier during CW contests such as FD with 100 watts output, I found setting up to save the K3 for high rate TXing exchanges at a lower duty cycle and stress so 500+Qs will keep full power as distributed at a cooler configuration W1QS
I've done this for about ten years, running a pair of K3s SO2R from a 100Ah LiFePO4 battery pack, float charged from a repurposed Thinkpad PSU through an rf-quiet MPPT charge regulator. The K3 is cleaner IMD-wise (clicks and splatter) at lower power and higher battery voltage, and that battery chemistry stays above about 12.7V under load through a long contest weekend. Before I went to LiFePO4, the SLA lived just above 11V.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
