NTP question

Mike Hammett nanog at ics-il.net
Wed May 1 20:53:22 UTC 2019

I had inquired with Frontier about installing a GPS antenna and they said they don't allow antennas of any kind attached to the building anymore. I didn't pursue that any further. I didn't think to check what the signal strength was inside. 

Mike Hammett 
Intelligent Computing Solutions 


----- Original Message -----

From: "Andreas Ott" <andreas at naund.org> 
To: nanog at nanog.org 
Sent: Wednesday, May 1, 2019 3:50:33 PM 
Subject: Re: NTP question 


On Wed, May 01, 2019 at 02:01:44PM -0600, Brielle Bruns wrote: 
> If you can't get a good spot for an antenna, you could be on the lookout 
> for a CDMA NTP clock. 

CDMA service is about to be retired in several places, please check 
in your area before you install a "new" CDMA based time server. 
C.f. https://www.verizonwireless.com/support/knowledge-base-218813/ 

I looked into the same thing and decided not to go with CDMA. 

A simple check inside a (datacenter) building is to use one of the GPS 
smart phone apps that display you number of Sats and signal strength then 
walk around where you would place the NTP server appliance. Beware of 
server CPUs and memory making RF noise in the same frequency spectrum of 
1.2 - 2 GHz, completely blanking out any GPS indoors. I concur that 
installing an amplified roof-top antenna and running coax to your receiver 
is the best option. 

Andreas Ott K6OTT +1.408.431.8727 andreas at naund.org 

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