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    Re: Status of Celestial Nav in 2015
    From: Mike Mayer
    Date: 2015 Mar 10, 20:05 -0500

    My understanding is that most lightning energy is below 1MHz.


    As another data point think of all of the TV transmitting antennas that are intentionally put in high exposed locations. They get hit by lightning all of the time and survive. The trick is to make sure the current from the lightning strike has a low impedance path that does not include the electronics that can be damaged. So it is possible to make electronics survive a direct strike.



    Mike Mayer



    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Örjan Sandström
    Sent: Tuesday, March 10, 2015 2:37 PM
    To: mwmayer@tds.net
    Subject: [NavList] Re: Status of Celestial Nav in 2015


    two conductors with dielectric between=capacitor.
    you put a capacitor as a attenuator between antenna and signal just cutting it down a bit.
    At 2.4GHz that signal saw little to slow it down, merely few hundred ohms of capacitive impedance at worst

    i do not know risetime for lightning so i can not say what impedance is needed...

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