Bought a 500 foot roll of Tram 8x coax for jumpers and other miscellany. Especially after using LMR 400 and 8u for jumpers, which is unecessary and stubborn. Finally got around to putting ends to some wires today. Very delicate, especially compared to LMR 400. Slow and careful work with the knife and razor, then the crimper, they first part looked very good. Then I set about soldering the center conductor. Instead of the usual old worn out solder gun, I decided to try my brand new American Beauty 60 watt solder machine. With some help, got the solder to flow pretty good, with the only thing I noticed was excessive smoke on a few. Especially one end that really smoked for a while after I put it in the coffee can to cool. Quick final check with the Hioki 3030 confirmed clean jumpers.... except for one. Center and shields showed continuity every which way you touched them. A complete failure and dud. After spending all that time being careful! Thinking of what could have gone wrong, I'm about completely certain I did not have any possible contact between the shield and center through loose wire, I was clean, slow, careful. On inspection I found that the PL259 on one side had a brown burn looking ring around the center. I make the assumption that with that bigger solder chisel and maybe too much solder flow, that I ended up burning through the foam and created a complete connection? CB radio with dummy load and SWR meter showed the rest are totally fine. I don't want to risk blowing up my Galaxy on a coax I know is bad. So.... Am I right in my assumption? Did I burn through the dielectric? Or was I sloppy afterall? Before I keep making (and wrecking) jumpers, what other possibility am I missing, what mistake did I make, and how can I do better?