[137031] in North American Network Operators' Group
Re: US Warships jamming Lebanon Internet
daemon@ATHENA.MIT.EDU (Denys Fedoryshchenko)
Tue Feb 8 07:46:24 2011
From: Denys Fedoryshchenko <denys@visp.net.lb>
To: Adrian Chadd <adrian@creative.net.au>
Date: Tue, 8 Feb 2011 14:34:38 +0200
In-Reply-To: <20110208124129.GC2861@skywalker.creative.net.au>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Tuesday 08 February 2011 14:41:29 Adrian Chadd wrote:
> On Tue, Feb 08, 2011, Denys Fedoryshchenko wrote:
> > On Tuesday 08 February 2011 14:18:59 Adrian Chadd wrote:
> > > On Tue, Feb 08, 2011, Denys Fedoryshchenko wrote:
> > > > 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.
> > >
> > > Can you get access to some kind of spectrum analyser kit to see what
> > > the kind of interference is?
> > >
> > >
> > >
> > > Adrian
> >
> > Yes, on short (few minutes) sweeps it is clean. During long time run,
> > with 100 Khz resolution, if we run few hours we can catch anomalies on
> > the carrier. Important note: this snapshot done on spectrum analyser in
> > Europe, same transponder, and results similar, so it looks like
> > interference is on transponder. Issue start to affect us at same time
> > when people in Lebanon got local interference issues.
> >
> > Here is snapshot of carrier spectrum with anomaly:
> > http//www.nuclearcat.com/PICTURES/interference.jpg
>
> And does this interference similarly screw up being able to RX data from
> the transponder whilst in Europe?
>
> (eg, if you stick a modem on RX-only in Europe (ie, no uplink) and then
> just lock onto the signal and decode whatever happens, do you suffer
> the same problem?)
Difficult, in Europe EIRP of transponder is too low, to try.
By the way interference almost disappeared yesterday, and it's much better
today.
