Hi Peter,
I am not sure where you got that information but I think it is wrong.
Here you can see the Andrew Heliax 1 5/8 LDF7-50A datasheet.
there you can read: 30 MHz Average Power 30.86 Kw (Page 3)
So, +40 Kw is greater than 30.86 Kw, so I understand that Heliax 1 5/8 is not
rated to +40 Kw.
Isn´t it?
73, Maximo - EA1DDO
> From: df3kv@t-online.de
> To: amps@contesting.com
> Date: Fri, 13 Jul 2012 11:16:02 +0200
> Subject: Re: [Amps] corona on a quad
>
> Fibreglass is a very poor isolator, especially when wet.
> It turned into flames at the 1KW level already when I used it at a high
> impedance point.
> 1 5/8" cable is rated for 32KW@30MHz permanent power and a 40°C environment
> temperature.
> If you need special care there is something else wrong.
>
> 73
> Peter, DJ7WW
>
>
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Máximo EA1DDO_HK1H
>
> The power issue is always happening in the quad´s corners, on driver and
> directors, burned!!
> Now is not burnng any more, after use Teflon corners over ceramic insulators
> (yes, with +40 Kw fibreglass is not isolating anymore).
>
> Coax cable is Heliax 1 5/8, but needs special care as well. since it is not
> rated to that power.
> nfo/amps
>
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