Re: US Warships jamming Lebanon Internet

[TR Shaw <tshaw () oitc com>]

On Feb 8, 2011, at 6:59 AM, Denys Fedoryshchenko wrote:

> On Tuesday 08 February 2011 01:42:42 George Herbert wrote:
> > On Mon, Feb 7, 2011 at 2:23 PM, Ryan Wilkins <ryan () 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.
> I try to install C-Band bandpass filter, no effect at all, so it is in-band 
> interference. Putting foil (yes i try almost everything) near LNB doesn't 
> affect interference level too.

It can come in from other places as well. Inductance via unfiltered/poorly-filtered power, poor I/F cabling as well as 
via other sources. 

Have you tried using a spectrum analyzer to characterize the signal in the ether and compare it to what you are seeing 
in your systems?

Tom