I have a K3 and K3S and looking at this issue for a week now. K3 FW 5.66 KPA3 KAT3 K3S FW 5.67 KPA3A KAT3A ATN6 set
Latest K3/K3S utility installed Test equipment includes HP 736 Wattmeter, Bird wattmeter, and a load with > 25db return loss. After running automated TX GAIN on either unit. K3 TX-LPGAIN is in range 12 – 16 K3S TX-LPGAIN is in range of 60-65 Exit TECH MD. SET ATU to AUTO Initiating a “ATU TUNE” on 52.000 MHZ the ATU finds a 1.2 match or better without issue. Setting the power control to 90W, the power out shown on the external wattmeter is 80 to 85W, with Tuner in AUTO or BYPASSED. Initiating a “ATU TUNE” lower in 6M band at 51.125 the ATU has trouble finding a match on both K3 and K3S. The K3 has more problems, and takes a lot longer. The resolved match on the K3 will be anywhere from 1.2 to 1.6, and setting power control to 90W, only 55 to 60 W is realized with Tuner in AUTO or BYPASSED. Running MANUAL TX LPGAIN only on 6M at 50.125 results in the following: K3 TX-LP GAIN is in the range of 62 to 70. K3S TX LPGAIN in in the range of 90 to 105. This appears to resolve the ATU matching issue (SWR < 1.2) and the lower power out (80 to 85W) at 50.125 MHZ Higher in the band at 52.000MHz operation appears to be the same. Ben W4SC Sent from Mail for Windows 10 ______________________________________________________________ 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]
