NTP question

Andreas Ott andreas at naund.org
Wed May 1 20:50:33 UTC 2019


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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