[time-nuts] Lots of Off Topic discussion

Scott McGrath scmcgrath at gmail.com
Sat Sep 1 15:20:17 EDT 2018

I’m concerned with the science 

the WWV/WWVB stations provide invaluable information about the condition of the ionosphere with a baseline of DECADES of data.  

Also dont forget that pre PSK the NTP daemon in unix had a interface for Spectracom WWVB receivers and any retrofitted with a D-PSK’er still provide network time within all national banking regulations.

As to GPS Jamming well I think its essential that sophisticated GPS users like this community educate decision makers in their sphere of influence just how FRAGILE a system GPS is.    I realize some dont want to hear this but its essential that we as a technological society create backup systems using different techology bases to deliver precise time and frequency in an economical fashion because not everyone can afford a couple of 5071’s.

As to only ‘hams’ using them I dont think many hams unless they are running vintage Collins gear with a WWV position on the bandswitch to align the PTO,  even know about WWV.

Most of the WWV users  I know personally are atmospheric scientists, military and other government users.

Content by Scott
Typos by Siri

On Sep 1, 2018, at 2:37 PM, Brian Lloyd <brian at lloyd.aero> wrote:

On Sat, Sep 1, 2018 at 9:13 AM, David G. McGaw <david.g.mcgaw at dartmouth.edu>

> I consider saving WWV/WWVH/WWVB to be ON topic.  They may not be as
> precise as some on this list like to achieve, but they are publicly
> available methods of time dissemination.  I am very concerned that factions
> of NIST consider that this should no longer be part of their mission.

I think it is still on-topic for the following reasons:

1. In many parts of the world, WWV is still a convenient time reference.
You can get human-accurate time with nothing more than a $20 shortwave
receiver.  No, it is not time-nuts accurate but it will do for most things
that people do, including celestial navigation and knowing when to come to

2. It is a stable RF source for people monitoring changes in the the
ionosphere. Whatever else it is, we KNOW they are emitting ON 2.5, 5, 10,
15, 20, and 25 MHz.

I also consider the discussion of GPS jamming to be relevant because, for
people who DO want/need time-nuts accuracy, GPS is far and away the most
convenient reference. Knowing how it might fail is useful.



Brian Lloyd
706 Flightline
Spring Branch, TX 78070
brian at lloyd.aero
+1.210.802-8FLY (1.210.802-8359)
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