[time-nuts] lightening protection of a GPSDO system / optical isolated distribution amp

Bob Camp kb8tq at n1k.org
Wed Nov 26 22:00:51 EST 2014


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. 


> On Nov 26, 2014, at 7:30 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> On 27 Nov 2014 01:14, "Chris Albertson" <albertson.chris at gmail.com> wrote:
>> After this minimum you have th think about the probability of a strike.
> If
>> you live in Orlando Florida then it might be 100% and nearly zero in other
>> places and then you ask what the radio equipment cost.   I paid $18 for
> my
>> Motorola Encore GPS receiver.
> Chris,
> if a GPS receiver was the only item that would get damaged I would not care.
> If it damaged 3 signal generators,  three VNAs, a frequency counter, and a
> spectrum analyzer, I would care.
> My experience with the lighting going down the telephone line and
> destroying a few computers, printer and modem would make me unhappy about
> an external antenna.
> Nobody has answered my other question - whether one gets a better
> disciplined oscillator with an external antenna.
> Dave.
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