[TowerTalk] GDT sizing for feedlines

[Jeff Blaine]

Steve,

PERFECT!!!  Thanks.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com


On 10/9/19 12:29 AM, VE6WZ Steve wrote:
> 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 at ac0c.com 
> <mailto:KeepWalking188 at 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 <http://www.ac0c.com>
>>
>>
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