I found this which might help:
http://www.arrl.org/files/file/QEX_Next_Issue/2016/July-August/Hinkle.pdf
73, de Steve Ve6Wz
Sent from my iPad
> On Oct 8, 2019, at 9:18 PM, Jeff Blaine <KeepWalking188@ac0c.com> wrote:
>
> I have a number of feedlines that I want to apply GDT out in the field
> too. This is to buy a bit of extra insurance on lightning events.
>
> But I am wondering how to match up the GDT selection criteria with an
> actual need. There are a number of specifications on the GDT and I
> think you want to pick the lowest voltage one that (allowing for
> tolerance) would not be triggered by expected RF AC levels.
> Unfortunately the spec does not say "if you are hanging this off your
> feedline, use this rule of thumb to size our DC spec to your needs."
>
> What "DC spark over voltage" would be the proper pick to go with say
> 1500W @ 50 ohms (275 RMS volts)?
>
> 73/jeff/ac0c
> alpha-charlie-zero-charlie
> www.ac0c.com
>
>
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