[time-nuts] GPS backup for the stationary time and frequencyuser

[jimlux]

Bob Camp wrote:
> Hi
> 
> The Russians have been willing to sell GPS jammers for quite a while. They aren't terribly expensive. Their export controls are a bit different than the US's.
> 
> Bob
> 

Simple GPS jammers are pretty easy, since consumer GPS is very 
vulnerable to repeater jammers.  Hmm I wonder if that would adversely 
affect a GPSDO?  Probably not, since the repeated signal is just as 
stable as the original one.

jammers probably aren't subject to export controls, just local usage 
regulations (e.g. illegal in US because of FCC rules prohibiting them).

the ITAR (which is the big deal in the export controls world, compared 
to EAR) is the *International* Tariff, so everyone is a signatory, and 
we're all in the same boat as to what is a munition and what is not. 
Granted, enforcement and interpretation varies.