Recently finished the build of my KX1 and noticed that the power output on 7 mHz is lower than on 14 mHz. The manual states that it is typically the opposite, with 14 mHz 0.2 - 0.3W lower. I checked the voltage across a dummy load with my scope, converting P-P to RMS and the using the 50 ohm load to calculate the output in Watts. Working into 50 ohms gives me 2.7W out on 7 and 3.6W on 14. Seems like the 14 mHz output is about right, but something is wrong with 7 mHz. The manual suggested squeezing the turns on L2 to occupy about 60% of the circumference of the core. Rather than improving things, the output on 7 mHz was reduced to about 2.3W, so I went back to the normal distribution of the coils. All of this is with a 14.0VDC well filtered and regulated power supply. In each case the VSWR was reported at 1.0 with the 50 ohm dummy load.
Any ideas anyone? Thanks and 73, Ron KB6K ______________________________________________________________ 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]
