thank you guys, looks like GPS based NTP is the way to go. On Wed, May 1, 2019 at 3:36 PM Bryan Fields <br...@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 >