Cable Asylum: RG-393 by Sean Interconnects, speaker wire, power cords. Ask the Cable Guys.

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Posted by Sean on July 26, 2000 at 11:35:39

In Reply to: Re: Some cautions about 9913 posted by vuman on July 26, 2000 at 08:41:25:

"But the Thermax-sonic RG393 also cost 10 times as much."

Hey, i said 393 was an UPGRADE over 213, right ??? : )

The only thing that i know about the 393 is that it will take a LOT of power without melting down and that it's quite expensive. We were pumping over 20 KILOWATTS RMS through it with no problems. The manufacturers will tell you that it will never take that kind of power, but i have seen it done on a daily basis. The bottom line is impedance matching. If the load is has any form of reactance to it, the cable starts to dissipate the reflected power instead of the load dissipating it. If the load is highly reactive, the cable can melt down WAY below it's power rating. I have seen cables that were rated for 800 watts of power actually melted with appr. 250 watts going through them. Of course, this was due to a very poor installation. I've seen the same cable swallow up over 2K without problems when everything is right.

As i stated previously, 393 uses a silver plated stranded copper center conductor, teflon insulation and two layers of silver plated copper shield. Given the extra layer of shielding, 393 is slightly lower loss than 213. The velocity factor on 393 (.69) is slightly higher than that of RG-213 (.66). I have no idea as to what it's sonics are like. I have it running in my car for my RF gear. Sean
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