[amsat-bb] Re: The Mode B tradition

John Champa k8ocl at hotmail.com
Fri Sep 15 17:39:40 PDT 2006

What is the matter with everyone?  If the guy next door is running WiFi on 
Channel 1,
it is a very simple matter to ask him to switch to another channel, isn't 
it?  It's just a
simple software toggle.  Any channel above 3 should be OK, and above 7 is 
out of
the band!

Laptops auto associate and find the channel, so only the channel in the AP 
needs changing.

We're only talking about 100 mW sources (maximum!) here folks.  Break out 
wireless laptop, load up NetStumbler (free software) and go visit a couple 

It's rather like solving a TVI problem in reverse, that's all.  You can 
handle it!  (HI)

>From: "i8cvs" <domenico.i8cvs at tin.it>
>To: "John B. Stephensen" <kd6ozh at comcast.net>,        "george abbott" 
><ka1ajf at cox.net>, "'Bill Ress'" <bill at hsmicrowave.com>,        "G0MRF David 
>Bowman" <g0mrf at aol.com>, <brobertson at mta.ca>,        "AMSAT-BB" 
><amsat-bb at amsat.org>
>Subject: [amsat-bb] Re: The Mode B tradition
>Date: Fri, 15 Sep 2006 14:20:41 +0200
>----- Original Message -----
>From: "John B. Stephensen" <kd6ozh at comcast.net>
>To: "i8cvs" <domenico.i8cvs at tin.it>; "george abbott" <ka1ajf at cox.net>;
>"'Bill Ress'" <bill at hsmicrowave.com>; "G0MRF David Bowman" <g0mrf at aol.com>;
><brobertson at mta.ca>; "AMSAT-BB" <amsat-bb at amsat.org>
>Sent: Friday, September 15, 2006 3:51 AM
>Subject: Re: [amsat-bb] Re: The Mode B tradition
> > The European contacts are similar to my experience in the U.S. Are you
> > certain that the contacts outside Europe weren't cross-band -- one end 
> > and the other US or LS? These would also have been completed on UV.
> >
>Hi John KD6OZH
>The US mode of OSCAR-13 was available only for short periods of time at
>low squint angle while all the other modes where OFF
>In addition there was not S downlink with L uplink on OSCAR-13
>Uplink             435.603 to 435.639 MHz
>Downlink      2400.711 to 2400.747 MHz
>G.Beacon      2400.664 MHz was ON
> > My biggest concern about the S downlink is that it is becoming
> > harder to use in many parts of the world so that it becomes less and 
> > useful over the life of the Eagle satellites (2010-2030).
>Only God know  20 to 25 years from now......... I am 74 years old !
>When AO-13 was
> > orbit I could use the S downlink all the time, but by the time AO-40 was
> > orbit, I had S9 WiFi interference for hours at a time -- even with 
> > dish and feed. The dish was fairly deep (0.33 f/d) and the feed shielded
> > sidelobes were low.
>I also experienced an increase of noise floor beginning from OSCAR-13
>and going to AO40 but here for the moment the S-band is still viable but
>this is like to randomly fire a shot to my head with a revolver with only
>one shot i.e. just in case a WiFi channel 1 will operate from the next door
>no way !
> >
> > Some in the U.K. say that we'd be better off flyng an S2 downlink
> > (3400-3410MHz).
> >
>The downlink of EAGLE in the S2 would be a great choise if we
>Europeans in Region-1 could get ITU to allow operation in S2 but who
>know if receiving only in a well protected and scarcely used band not
>allowed to us or to unlicenced services should be good even without a
>rules changes ? ?
>Unfortunately for the moment I don't own  a 3400-3410 MHz converter
>with a feed for my dish to scan the band but just for curiosity I will try
>using my spectrum analyser.
> > 73,
> >
> > John
> > KD6OZH
> >
>73" de
>i8CVS Domenico
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