I have used RG-59 for DC over 5000volts and the larger RG-8 type over 20kV.
But the ratings in the catalogs have more to do with UL and CSA classifications
and in some cases
may be real voltage limits but with RF AC voltage applied to the coax
(dielectric loss limitations).
But dielectric losses are a function of frequency so you rarely see that sort
of limitation listed.
73
Bill wa4lav
________________________________________
From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of
Alex [alexeban@gmail.com]
Sent: Saturday, April 25, 2009 4:03 AM
To: 'Rex Lint'; dezrat1242@yahoo.com; amps@contesting.com
Subject: Re: [Amps] High SWR
... sorry, but something really doesn't fit!
RG 213 has a withstand voltage closer to 6000 (six thousand) volts rather
than 600!
Alex 4Z5KS
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Rex Lint
Sent: Thursday, April 23, 2009 4:02 AM
To: dezrat1242@yahoo.com; amps@contesting.com
Subject: Re: [Amps] High SWR
Huh? 600 Volts? Where did that figure come from?
-Rex-
K1HI
Rex Lint
Merrimack, NH
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Bill, W6WRT
Sent: Wednesday, April 22, 2009 7:53 PM
To: amps@contesting.com
Subject: Re: [Amps] High SWR
ORIGINAL MESSAGE:
On Wed, 22 Apr 2009 17:39:22 -0400, Pete Smith <n4zr@contesting.com>
wrote:
>, but SWR, per se, is not
>something to worry yourself about, so long as the amplifier can match the
load.
REPLY:
I agree up to a point. The main villain with SWR, IMO, isn't loss, it
is the excess voltage present on the line. Most coax, even the RG-213
size, is rated for only 600 volts. If you have a 2:1 SWR at 1500 watts
you are living on the edge already. Go to 3:1 and you have crossed the
line.
I won't say it can't be done, but a wise op won't.
73, Bill W6WRT
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