RE: [amsat-bb] 2.4GHZ jamming?

["Howard Long" <howard@xxxxxxxxxxxxxx>]

Hello Makis

I have an almost identical problem over a 10MHz bandwidth centered on
2400MHz when I point west towards North America with S9+40 noise across the
spectrum. I don't think that it's WLAN traffic though because WLAN traffic
in my experience appears as intermittent bursts, not a continual stream.

When I get a moment I'll be out with a directional antenna and spectrum
analyser to trace it. I guess one benefit of microwaves is that DFing them
can be quite easy.

73 Howard G6LVB

-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of Makis
Sent: 29 April 2003 22:55
To: Amsat-BULL
Subject: [amsat-bb] 2.4GHZ jamming?


   Hi AMSATs

 I wondering what happen with "Short Range Devices used for Radio Local Area
Networks" (RLANs) operating in the frequency band 2400 - 2483.5 MHz.

Has anyone any jamming on AO40 Download frequency?   There are several
Metropolitan Networks now in use !
And probably they don't using just wireless Ethernet cards, but external
antennas also with much higher output power!

   I began wondering during my tests, when the A040 was on very Low
Elevation and Bearing 230-260°, ideal for QSOs with most parts of United
States. But, in this bearing and elevation angle I have  extremely high
level of noise.

 I 'm looking for the noise source....  any idea, welcome !

  73, Mak SV1BSX

SS: a link about harmonised frequencies, technical characteristics and
exemption from individual licensing of RLANs:
http://www.ero.dk/doc98/official/Word/DEC0107E.DOC


sv1bsx@yahoo.gr
http://www.qsl.net/sv1bsx



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