[time-nuts] lightening protection of a GPSDO system

[Joseph Gwinn]

Time-nuts Digest, Vol 124, Issue 119


On Thu, 27 Nov 2014 11:23:14 -0500, time-nuts-request at febo.com wrote:


> 
> Message: 5
> Date: Thu, 27 Nov 2014 09:24:38 +0000
> From: "Dr. David Kirkby (Kirkby Microwave Ltd)"
> 	<drkirkby at kirkbymicrowave.co.uk>
> To: Discussion of precise time and frequency measurement
> 	<time-nuts at febo.com>
> Subject: Re: [time-nuts] lightening protection of a GPSDO system /
> 	optical isolated distribution amp
> Message-ID:
> 	<CANX10hCSk_LbHwx3AZGr0a4eJQzssChfiR2wV8FDznSXns2pXA at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
> 
> On 27 Nov 2014 03:06, "Bob Camp" <kb8tq at n1k.org> wrote:
>> 
>> Hi
>> 
>> You need a good antenna setup to get a good disciplined oscillator. The
> bigger question is if you *need* the sort of “better” it gives you. If you
> are running a simple TCXO based GPSDO, you will have a number of issues to
> deal with compared to an OCXO or Rb based system. If “better” is an
> objective, consider the entire system.

There are lightning arrestors designed specifically for outside GPS 
antennas.  These arrestors go in the coax cable from antenna to 
receiver.  Typical setup is to put a lightning rod near the antenna to 
take the main hit, to protect the antenna and arrestor most of the 
time, to save the expense of replacing antenna and arrestor every time.

Joe Gwinn