I've experienced loss-of-signal of late, several times. I don't have a spectrum analyzer here in Norman capable of seeing that frequency, but if someone knows where we might find one... it could be an interesting fox hunt.

73 gerry n5jxs

On Wed, Nov 7, 2012 at 9:50 AM, Zac Flamig <[log in to unmask]> wrote:
Just in case any of you guys know something...

Zac



-------- Original Message --------
Subject: Fwd: GPS Interference
Date: Wed, 07 Nov 2012 05:33:35 -0600
From: Bob Staples <[log in to unmask]>
To: [log in to unmask]


Please note the email from Forest Mitchell ( WFO) and advice me of anyone you know or that may be conducting experiments that would interfere with the GPS signal ?

Thanks,
Bob D Staples


-------- Original Message --------
Subject: GPS Interference
Date: Wed, 07 Nov 2012 04:20:17 -0600
From: Forrest Mitchell <[log in to unmask]>
To: Bob Staples <[log in to unmask]>
CC: David Andra <[log in to unmask]>, [log in to unmask], [log in to unmask], John Pike <[log in to unmask]>, Daryl Williams <[log in to unmask]>, Doug Speheger <[log in to unmask]>, Rick Smith <[log in to unmask]> 


In the past week, we have been experiencing interference with acquiring 
a GPS signal for the radiosondes we launch for Upper Air flights. The 
GPS signal is critical towards acquiring accurate wind data aloft.

The interference is centered around the NWC, as measured by coworkers 
using a variety of GPS devices. The interference occurs during the 
afternoons, affecting us
during our launch window from 5-6:30 pm.  It then disappears around 7 
pm. There is no interference during the morning flights.

Is there some experiment being performed by someone within the NWS 
community that could be causing the interference? We would appreciate 
your efforts to find the source
so that we may create a solution to allow us to perform our mission in 
its entirety. Thank you.