[BC] RG-8

[RichardBJohnson at comcast.net]

Did you read it or did you just grab a sentence
out of context and argue?

And do the math. The loss is  0.1 dB per 100 feet.

0.1 dB at 31,250 watts is : 
0.1 dB is 1.023
31,250 / 1.023 = 30,529 out
31,250 - 30,259 = 991 watts loss in 100 ft.
991 / 100 = 9.91 watts per foot which is and I quote;
" MUCH more than you would like!"  


--
Cheers,
Richard B. Johnson
Read about my book
http://www.LymanSchool.org


 -------------- Original message ----------------------
From: dynotherm at earthlink.net
> 
> 
> -----Original Message-----
> >From: RichardBJohnson at comcast.net
> >Subject: Re: [BC] RG-8
> >
> >Bob,
> >RG8/AU is pretty good. The insulation will handle 30 kV!
> >This doesn't mean RF connectors will. Many Hi-pot testers
> >use RG8 cable stripped back about 4 inches so there is
> >about 4 inches of polyethylene before the shield. From
> >a UL ampacity perspective, the inside wire is 11 gauge
> >and will therefore handle 25 amperes, MUCH more than
> >you would like!  That is 31,250 watts!
> 
> Quick! Get me the hip waders and the Bobcat. This is
> getting so deep a shovel can't begin to keep up. <ggg>
> 
> That is the problem with leaving out critical points
> like the loss which = HEAT and the plastic temp of
> polyethylene. Get REAL! The stuff will melt into a
> pile of glop long before you get 3000 W through it,
> let alone 30 (!) kW.
> 
> Phil Alexander, CSRE, AMD
>