[TowerTalk] VSWR Heating in Chokes and Baluns

[HP]

Ok -- here is a suggestion ----- if the question is what is causing the cores to heat .... 

some "electric field" or ampere turns magnetizng flux. 

Make a short piece of bifilar transmission line - parallel or twisted but with insulation that will withstand heat -like teflon. 

Make the line it long enough to put some 5 to 10 turns on a subject core. Set up your tx to fed a dummy load with this 
section of line/core in series and run say a Kw or so into the dummy load - calculate the current . For this case 
there should be nil amount of ampere turns magnetizng the core. Measure the core temperature after x min or seconds 

Now just disconnect the "ground " side side of the bifilar transmission line at both ends -leave it float and insert a capacitor 
of the values needed in series with the "hot' conductor to series resonate out the inductance of that winding and run the same 
power -. See what the temp is after the same X seconds or min . 












































































































































































































































































































































































































































































----- On Sep 4, 2020, at 5:04 AM, W4TV Joe Subich <lists at subich.com> wrote: 


Balun/common mode choke what is the difference? Neither 
should be magnetizing the core unless you are talking 
about a magnetically coupled transformer like the isolation 
transformer in an FCP system. 

73, 

... Joe, W4TV