Well, according to the wire tables, the 26 gauge center conductor can
safely handle about 350 to 400 milliamperes, depending on how you
interpret the safety factors. The center conductor is certainly not
operating in "open air", so the best figure is probably the one used for
wire in bundles.
That works out to 10 watts or thereabouts, which strikes me as about
right for RG-174. Give or take a little room for SWR, this sounds like
a safe "rule of thumb" for normal use.
At 1800 watts, I would stand waaaay back when power was applied! Can
you say "BOOOM" ?
- Jim, KL7CC
Nick-WA5BDU wrote:
Well, that shows that it ought to be OK from the voltage breakdown
perspective, but consider current carrying capability or self heating
of that little bitty center conductor too. It might be limiting.
If you allow it an amp, 50 watts. Two amps, 200 watts. At 100 watts
of course, 1.414 amps. Probably OK, I'd think. But I don't know that
I'd go much higher.
73--Nick, WA5BDU
Don Wilhelm wrote:
Mike,
My chart in the ARRL Handbook says RG-174 has a dielectric breakdown
voltage of 300 volts RMS. So in theory, it will handle 1800 watts at
an SWR = 1.0 (less at higher SWR) - but I would not trust it at much
over 25 watts myself. I like to see a larger safety factor where
transmission lines are concerned. The ohmic losses may be great too,
that all depends on the length and the SWR.
73,
Don W3FPR
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