[time-nuts] NIST

Tue Aug 14 01:57:29 UTC 2018

Hi

Well, if you are worried about L1 jamming, use a receiver that can run on L1/L2/L5 and maybe a few of the other 
bands as well. Broadband jammers make *really* good targets, even for a pretty “dumb” weapon / tracking system. 
The more bands they cover, the easier they are to spot. 

Broadband jamming really isn’t that big a deal. The GPS signal gets buried in the noise and the GPSDO goes into 
holdover. If they can’t track down / eliminate the jammer in 24 hours ….. that’s because there’s a very high level of
other radiation ….Again, the jammer is probably pretty far down the list if this is the case. 

So yes, if you are trying to navigate in an active war zone, things can get a bit weird. I doubt that any of us will be 
trying to come up with timing for our bench under those conditions. 

Bob

> On Aug 13, 2018, at 7:48 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
> 
> WRT my sextant comment,   How many pilots or sailors can navigate by ‘shooting the sun/stars’.  They have become dependent on precision navigation systems.   
> 
> Which of course feeds the thinking by empty suits why do we need lighthouses, buoys, VOR’s and airway beacons because we have the ‘god box’ onboard.   Its old fashioned and uncool.
> 
> Interestingly enough there have been enough GPS ‘outages’ that the USNO is once again requiring proficiency in celestial navigation in order to graduate food for thought there.
> 
> I was initially speaking about loss of GPS due to natural causes.   In times of international tension attacking a country by denying its ONLY source of precision time transfer would be a particularly effective tactic and you dont even have to damage the satellites themselves.   Just jam L1
> 
> As to relying on systems operated by one’s political adversaries that does not seem to be a wise option.
> 
> So once again for US’ians time to pick up the phone and put pen to paper and state while the US budget is bloated.   This particular item NEEDS to stay.   Find a vanity construction project and make it disappear instead.   And point out the technical reasons it needs to stay.
> 
> 
> Scott
> 
> 
> On Aug 12, 2018, at 4:49 PM, Joe Dempster <joe.dempster at gmail.com> wrote:
> 
> I hope that defunding is just a ploy and things will remain on the air.  I
> am concerned this is starting to sound like 2010 when DHS/USCG took eLoran
> off the air in the states.  This was one of the few things that totally
> dismayed me about the Obama administration.
> 
>> On Sun, Aug 12, 2018 at 2:59 PM djl <djl at montana.com> wrote:
>> 
>> Just a word:   When budget cuts are announced, the agencies put the most
>> valued "stuff" to be cut first, such as the Washington monument, etc.
>> This is a recognized ploy. When the dust settles, all may be well. . .
>> Don
>> 
>> 
>>> On 2018-08-12 12:20, paul swed wrote:
>>> Like all of you I have a few wwvb clocks that work pretty well here in
>>> Boston.
>>> Certainly have written enough wwvb stuff and created various wwvb
>>> projects
>>> that I will have to get back into it again.
>>> I did look at the cron-verter. Have to say it has a lot of nice
>>> features.
>>> Unfortunately it hasn't been available for a year or so. (Getting lazy)
>>> The good news is the AM modulation of wwb is very easy to create.
>>> Regards
>>> Paul
>>> WB8TSL
>>> 
>>> On Sat, Aug 11, 2018 at 10:48 PM, Dana Whitlow <k8yumdoober at gmail.com>
>>> wrote:
>>> 
>>>> I fear the worst.  The line in the website simply stated something
>>>> like
>>>> "shutting down
>>>> the transmitters in Colorado and Hawaii", which would seem to include
>>>> the
>>>> whole
>>>> enchilada.
>>>> 
>>>> For the wall clocks, GPS should work well if people are willing to go
>>>> to
>>>> battery-
>>>> backed AC power.  But not so good for wristwatches, where the
>>>> expectation
>>>> is to
>>>> run at uW power levels.  I for one would be very irritated at having
>>>> to
>>>> take my watch
>>>> off my wrist and put it on a charging stand every night.  So if this
>>>> shutdown comes
>>>> to pass, I'll be looking for an inexpensive GPS-to-WWVB converter, or
>>>> at
>>>> least
>>>> plans for building one.
>>>> 
>>>> Dana
>>>> 
>>>> 
>>>> On Sat, Aug 11, 2018 at 8:12 PM, Bob Albert via time-nuts <
>>>> time-nuts at lists.febo.com> wrote:
>>>> 
>>>>> With any luck, the current administration will successfully push the
>> USA
>>>>> down technically.  Denying global warming, shutting off time signals,
>> and
>>>>> so on, is great stuff.
>>>>>   On Saturday, August 11, 2018, 6:10:12 PM PDT, Bob kb8tq <
>>>> kb8tq at n1k.org>
>>>>> wrote:
>>>>> 
>>>>> Hi
>>>>> 
>>>>> One would *guess* that stopping WWVB (and killing mom and pop’s
>> “atomic
>>>>> clocks”) would not be a reasonable thing to do.
>>>>> It gets a lot of voters mad. I doubt that very many voters (percentage
>>>>> wise) would notice WWV and WWVH going away ….
>>>>> 
>>>>> Bob
>>>>> 
>>>>>> On Aug 11, 2018, at 9:00 PM, jimlux <jimlux at earthlink.net> wrote:
>>>>>> 
>>>>>> On 8/10/18 12:45 PM, Robert LaJeunesse wrote:
>>>>>>> I'd say it does get more detailed, with the $49M in cuts described
>>>>> generally in groups here:
>>>>>>> https://www.nist.gov/director/fy-2019-presidential-budget-
>>>>> request-summary/fundamental-measurement-quantum-science-and
>>>>>>> One item: "-$6.3 million supporting fundamental measurement
>>>>> dissemination, including the shutdown of NIST radio stations in
>> Colorado
>>>>> and Hawaii"
>>>>>> 
>>>>>> I wonder if that's WWVB, or WWV & WWVH
>>>>>> 
>>>>>> _______________________________________________
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>>>>> 
>>>>> 
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>> 
>> --
>> Dr. Don Latham
>> PO Box 404, Frenchtown, MT, 59834
>> VOX: 406-626-4304
>> 
>> 
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> 
> 
> -- 
> Joe Dempster
> +1 908 413 2889 (mobile)
> -- 
> Joe Dempster
> +1 908 413 2889 (m)
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