Hi all, I have just finished building and testing my KPA100 kit, and the power output seems low (87-89 Watts) on 10, 12, and 15 meters. Is this typical? I have triple checked that the parts are installed properly in the 10-15m low pass filter stage, and everything looks good there. After verifying the LPF was okay, I went back and measured output power from the K2 without the KPA100 installed. Here are the numbers. The first column is the band in question, second is the transmit power without the KPA100 installed (barefoot), third is with the KPA100 installed but powered through the original low power DC input (amp installed but bypassed), and the fourth is with the KPA100 installed and powered through the KPA100 high power DC input (amp installed and active).
10m 8W 7.5W 87W 12m 9.75W 9W 87W 15m 11.5W 10.5W 89W 17m 12W 11W 106W 20m 12W 11W 100W 30m 13W 11W 106W 40m 14W 11.5W 107W 80m 13.5W 11W 105W 160m 12.5W 12W 111W When the KPA is hooked in but bypassed (column 3), why is the power output lowered? Is it because of the second set of low pass filters (on the KPA100 board) coming in line? I was surprised to see the transmit power level drop so much if this is the cause. Are my barefoot numbers fairly typical? Looks like the KPA is giving me pretty consistent gain, so do I need to be looking upstream somewhere in the original K2? If so, why the big jump on the KPA100 output between 15 and 17 meters? Any thoughts or ideas appreciated. Thanks and 73, Mike Fanning, K4GU K2 #5882 ______________________________________________________________ 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
