[time-nuts] Re: UTC Backbone in Europe

[Eric Scace]

  More importantly, what is the cost of including 1-2 alternate systems (radio, inertial, or something else) in the same chipset that is being delivered at large scale?

   Having alternative systems is not helpful if they are not being used at similar scale to GPS.

   In the overall cost equation, expensive jam-resistant signal sources are justified when divided across billions of devices. Similarly, thousands of less expensive sources (eg triangulation of terrestrial short distant broadband signals) is also viable when used by billions of devices.

> On Nov 21, 2024, at 14:51, Hal Murray via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> 
> W3AB said:
>> As y'all know, GPS jamming is easy. We need to have an alternative.
> 
> How hard is it to jam Loran?  Or WWVB, JJY, MSF, and other low frequency
> time signals?  How about the not so low frequencies?
> 
> What are the units of jamming difficulty?
>  watts per square kilometer?
> How would you scale that by the difficulty of building the antenna?
> 
> 
> There is an interesting table of radio time stations in Wikipedia's Radio
> clock page:
>  https://en.wikipedia.org/wiki/Radio_clock
> I didn't realize how many there are.
> 
> 
> --
> These are my opinions.  I hate spam.
> 
> 
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