Thanks to Wayne, Tony, and Don for their answers to my question. I am going to use my DL-1 20-watt load and do the calibration manually and monitor the heating of the resistors (actually, I have a nice Fluke temperature measurement tool to do job if needed).
73, phil, K7PEH > On Mar 28, 2015, at 5:37 PM, Wayne Burdick <n...@elecraft.com> wrote: > > Anything under 2:1 will allow the TX GAIN calibration to work, but I'd shot > for < 1.5:1. > > Wayne > N6KR > > > On Mar 27, 2015, at 5:27 PM, Phil Hystad <phys...@mac.com> wrote: > >> I have two dummy loads that might be useful for the 50-watt TX-gain >> calibration but neither of them are dead on with a 1:1 SWR and 50 ohms >> resistive load. Actually, my smaller 150 watt dummy load is closest with a >> range of 42 ohms on the load to about 55 ohms on the high end as I step >> through the frequency ranges of my Antenna analyzer. My 1500-watt dummy >> load is worse as the resistance goes up to 87 ohms Z (resistive plus >> reactive) with 54 MHz test signal (using MFJ 259 analyzer). >> >> My little Elecraft DL-1 20-watt dummy load (mini-module kit) is best as it >> is flat 50-ohms resistive across the entire HF spectrum. I am thinking of >> using and following the advice of Wayne to let it cool down between bands. >> But… >> >> If I want to let the dummy load cool down between bands then can this be >> done using the automated procedure with the K3 utility or do I have to run >> the manual procedure. In other words, does the automated procedure allow me >> to automate the process on a band by band basis. I have not tried it yet >> because I didn’t want to start something until I was ready to finish it (and >> I have not installed the latest firmware yet). >> >> Question: How accurate should the dummy load be — is an SWR of 1.2:1 and >> under good enough? >> >> Question: Does the K3 Utility allow me to perform the TX gain calibration >> on a band by band basis? >> >> Thanks. >> >> 73, phil, K7PEH >> >> >> ______________________________________________________________ >> 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 n...@elecraft.com > ______________________________________________________________ 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
