I can confirn the ruggedness too - close thunderstorm strikes using the pa0rdt 
probe in Ghana, Singapore, Namibia, Malaysia, Fiji,  Indonesia and China etc 
all failed to destroy. Only one time the device failed was a very very close 
strike on the same tree as the probe was stationed Oklahoma!


Laurence

> On Jul 16, 2018, at 11:54 AM, Roelof Bakker <[email protected]> wrote:
> 
> Hello Marco,
> 
> The J310 is a sturdy device.
> In a strong RF field the gate starts to conduct and the gate voltage does not 
> rise any higher.
> The device protects itself so to speak.
> 
> Due to the small size of the 'PCB-antenna' of 30 x 40 mm, voltage build up 
> due to nearby 
> thunderstorms is low compared to e.g. a 1 meter long whip antenna. Hence 
> reports of defunct 
> antennas due to lightning are rare.
> 
> The most common cause of failure is accidentally sending 100 W RF or more up 
> the feed-line! 
> 
> 73,
> Roelof, pa0rdt
> 
>