Suhner data shows approx. 500W based on dielectric strength, but there's
a second 'low SWR' curve on the chart which extrapolates to around 1500W
at 1.3GHz. The spec. also gives 10kW for 1us. The contact resistances
are listed as a few milliohms, so you'd be looking at 10s amps to create
significant heating.
Not all SMAs (or other connectors) are created equal. I handle many
brands of connector; I reckon Suhner are consistently the best quality,
and that's not pro Eu/anti US bias :-)
UTI rate .141" coax for 300-400W at 1GHz, depending on the materials and
plating. This will push the cable to max. rated temp., 125 or 150C I
think, so might be more than you'd choose to run if you don't want to
burn your fingers.
Steve
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