The reason why an RG8X insn't raccomandable at high power levels is
because of a shield that's made of a thin aluminum Foil-Polyester Tape-
Aluminum Foil and only very few thin copper wires as braid shield.
The foam dielectric hasn't significant losses and a foam cable of the
same size of an RG8X, but with a classic copper braid or a more
consistent foil (aluminium or copper), would safely withstand much more
than US legal power at 7 MHz, and roughly twice the power of an RG58
expecially at 30 MHz and above.
> ---------- Initial message -----------
> From : email@example.com
> To : <firstname.lastname@example.org>
> Cc :
> Date : Thu, 1 Mar 2001 08:35:18 -0500
> Subject : RE: [TowerTalk] Coax Rating
> Be careful. Yes, I have had a meltdown as you call it, using some
> hamfest-grade RG8X on a 100 ft run feeding a 1/2 wave on 40. The
> the feed line was likely about 700W. I don't know whether this
> while operating on 40 or 15. And here's the caution...you might
> with a perfectly flat SWR. But with 3/2 waves I'd bet you will not
> that. Any SWR will significantly increase the probability of zapping
> As I recall, the rating is about 300V across that foam dielectric.
> sure of that than the above. I believe RG58 is actually more
> RG8X in terms of power handling.
> I'm using RG8 now, with a convenient tree to help support the weight
> antenna doesn't have to see it all.
> 73/Gary W2CS
> | -----Original Message-----
> | From: email@example.com
> | [mailto:firstname.lastname@example.org]On Behalf Of Ted & Joyce
> | Sent: Wednesday, February 28, 2001 11:39 PM
> | To: email@example.com
> | Subject: [TowerTalk] Coax Rating
> | Am planning on trying to put up 3 1/2 waves on 40mtrs. and wonder
> | anyone knows the maximum power that RG8X will handle on a relatively
> | short run less than 100 feet....I know I would probably be better
> | with something like 213 or the like but am concerned with the weight
> | factor....Anyone had any major meltdowns using the lighter feed
> | Thanks,
> | Ted K9HUH
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