US Warships jamming Lebanon Internet

Tue Feb 8 13:26:01 UTC 2011

I'm in San Diego and at my last company we had to replace all 2.4Ghz wireless with 5Ghz when we started getting hammered across that range by a signal about 90db higher than our APs by something.  We were never able to identify what it was, but the signal looked odd and an ex-navy coworker said it looked like encrypted navy traffic.  It always came in burst and would disconnect every user when it happened.  Too bad they weren't doing it the day we did our site survey.

-----Original Message-----
From: George Herbert [mailto:george.herbert at gmail.com] 
Sent: Monday, February 07, 2011 3:43 PM
To: Ryan Wilkins
Cc: nanog at nanog.org
Subject: Re: US Warships jamming Lebanon Internet

On Mon, Feb 7, 2011 at 2:23 PM, Ryan Wilkins <ryan at deadfrog.net> wrote:
>
> On Feb 7, 2011, at 4:06 PM, Michael Painter wrote:
>>
>> Hi Denys
>> I doubt it's intentional jamming since I've had the same problem.
>> Aegis radar is very high power in full radiate mode and as such creates problems for Low Noise Amplifiers listening at 3.4-4.2 GHz.
>> Someone needs to talk to Microwave Filter Company.
>> http://www.microwavefilter.com/c-band_radar_elimination.htm
>>
>> --Michael
>
> +1 for Microwave Filter.  They've helped me out in a couples jams before.  They're very responsive and the products are good, too.

I think people in San Diego and near Norfolk, VA have the same problems.

The C-band frequencies are 2x those of the S-band (4-8 GHz for C, 2-4 GHz for S); if the SPY-1 / SPY-1D radar is frequency hopping it may well step on someone's C-band links at twice the radar's basic frequency.  Just need a filter to remove actual S-band frequencies from C-band feeds.

--
-george william herbert
george.herbert at gmail.com