Re: NTP question

[Mehmet Akcin <mehmet () akcin net>]

thank you guys, looks like GPS based NTP is the way to go.

On Wed, May 1, 2019 at 3:36 PM Bryan Fields <Bryan () bryanfields net> wrote:

> On 5/1/19 3:22 PM, Mehmet Akcin wrote:
> > hey there Nanog,
> >
> > I am trying to buy a GPS based NTP server like this one
> >
> > https://timemachinescorp.com/product/gps-time-server-tm1000a/
> >
> > but I will be placing this inside a data center, do these need an actual
> > view of a sky to be able to get signal or will they work fine inside a
> data
> > center building?
>
> You will need a clear view to the sky for at least the antenna.
>
> Most GPS "antennas" are an antenna and Low Noise Amplifier (LNA) which is
> powered via 5-12v on the coax.  This sets the noise figure and gain of the
> system, so you can run 50-100' of RG6 coax if needed.  You'll need a F to
> sma
> adapter for this unit it looks like.  Don't worry about the impedance
> mismatch, 50 to 75 ohm is not horrid, the RG-174 thin cable has more loss
> in
> 10' than 100' of RG6.
>
> You will not want to use the low gain puck antenna, but rather get a proper
> grounded/mounted/weatherproofed antenna such as the ubiquitous 26 dBi
> Quadrifilar Helix antenna. https://www.ebay.com/itm/192899151132
>
>
>
> --
> Bryan Fields
>
> 727-409-1194 - Voice
> http://bryanfields.net