[Elecraft] This will effect pilots and Hams throughout the Western US

[Jim Sheldon]

That's going to be difficult to answer without knowing just what effect these "events" will have on the signals received by the GPSDO's control receiver. If the GPS signals are "spoofed" the GPSDO could very well be driven off frequency, causing the K3EXREF to cause the radio's frequency to be off by quite a bit, actual amount and direction unknown. If the signal simply is blocked, the effect will probably be very minimal and will vary by the frequency and stability of the GPSDO's unlocked crystal oscillator.  

Without knowing exactly what they are doing, and exactly how that will affect the actual reception of the GPS (or GLONASS) signals, it will be impossible to predict exactly what will happen and that's why it should be of concern. 

Jim - W0EB

> On Jun 10, 2016, at 5:35 PM, Michael Walker <va3mw at portcredit.net> wrote:
> 
> If it is a concern to those with the K3EXREF, what happens to their
> frequency stability?
> 
> Are they now off frequency?  What is plan B if your K3EXREF reference fails?
> 
> Does this even affect those?  If it does, than I am sure it will affect
> most cell circuits as well.
> 
> Just curious.
> 
> 
> 
>> On Fri, Jun 10, 2016 at 6:32 PM, Jim Sheldon <w0eb at cox.net> wrote:
>> 
>> Actually it Is of concern to all K3 and K3S owners in and close to the
>> affected area who use GPS disciplined oscillators to enhance frequency
>> accuracy and stability via the K3EXREF module.
>> 
>> Jim - W0EB
>> 
>> Sent from my iPad
>> 
>>>> On Jun 10, 2016, at 5:14 PM, Michael Walker <va3mw at portcredit.net>
>>> wrote:
>>> 
>>> 
>>> It really isn't an Elecraft issue.  :)
>>> 
>>> Mike va3mw
>>> 
>>> 
>>>> On Fri, Jun 10, 2016 at 6:01 PM, Wes Stewart <wes_n7ws at triconet.org>
>> wrote:
>>>> 
>>>> How times have changed.  Back in 1997, when I was working as a
>> contractor
>>>> for my old company, Hughes Missile Systems (now Raytheon), I worked on
>>>> implementing some jamming tests on the Tomahawk missile GPS.  FWIW, we
>> put
>>>> the missile section on a wooden pedestal covered in RF absorber on top
>> of
>>>> the rotating plate (also covered in absorber cones) under "The Arc" as
>> seen
>>>> here:
>> http://www.kgun9.com/news/local-news/test-facility-at-ft-huachuca-assures-working-communications-equipment-for-soldiers
>>>> 
>>>> Just for giggles, I climbed (took the stairs) "The Red Tower", the top
>> of
>>>> which would contain a good sized ham shack.  The tower is completely
>> wooden
>>>> and held together by fiberglass bolts.  The "dish" that is behind the
>> guy
>>>> being interviewed is actually a shaped reflector that in combination
>> with a
>>>> horn located below ground level forms a folded "compact" range, for
>> those
>>>> who understand such things. The leaning airfoil shaped tower holds the
>> test
>>>> subject at the plane-wave focal point of the reflector.  An M1 Abrams
>> tank
>>>> can be supported and rotated on top of this tower.
>>>> 
>>>> We had to do our testing in the wee hours of the morning, with secure
>>>> communications links to range people who could tell us to shut down at a
>>>> moments notice and our jammers were on a, few minutes on-lots of minutes
>>>> off schedule.
>>>> 
>>>> Wes  N7WS
>>>> 
>>>> 
>>>>> On 6/10/2016 1:03 PM, Fred Townsend wrote:
>>>>> 
>>>>> This Is Likely Why The Navy Is Causing A Massive And Mysterious GPS
>> Outage
>>>>> In The Western US - The Drive
>> http://www.thedrive.com/the-war-zone/3865/this-is-likely-why-the-navy-is-cau
>>>>> sing-a-massive-and-mysterious-gps-outage-in-the-western-us
>>>>> 
>>>>> Fred, AE6QL
>>>> ______________________________________________________________
>>>> Elecraft mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:Elecraft at mailman.qth.net
>>>> 
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> Message delivered to va3mw at portcredit.net
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft at mailman.qth.net
>>> 
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to w0eb at cox.net
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to w0eb at cox.net