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Re: The Mode B tradition, was Re: The Eagle has died.



As Bruce says, the plan for Eagle is 2 satellites much smaller than AO-40 
with the mode (B or UV) that was used on AO-10, AO-13 and AO-40. Two 
problems with previous phase 3 satellites were that the transponder had to 
be turned off during parts of the year and some modes only worked near 
apogee. Consequently, a new mechanical design was proposed that allows 
operation at all sun angles encountered in Eagle's orbit and has gain 
antennas that work over approximately 75% of the orbit.

73,

John
KD6OZH

----- Original Message ----- 
From: "i8cvs" <domenico.i8cvs@tin.it>
To: <brobertson@mta.ca>; "AMSAT-BB" <amsat-bb@amsat.org>
Sent: Thursday, September 14, 2006 18:53 UTC
Subject: [amsat-bb] Re: The Mode B tradition, was Re: The Eagle has died.


> ----- Original Message -----
> From: "Bruce Robertson" <broberts@mta.ca>
> To: "AMSAT-BB" <amsat-bb@amsat.org>
> Sent: Thursday, September 14, 2006 5:22 PM
> Subject: [amsat-bb] The Mode B tradition, was Re: The Eagle has died.
>
>> Quoting i8cvs <domenico.i8cvs@tin.it>:
>>
>> > ----- Original Message -----
>> > From: "Robert Oler" <cvn65vf94@msn.com>
>> > To: <kc6uqh@cox.net>; <domenico.i8cvs@tin.it>; <vk6xh@arach.net.au>;
>> > <amsat-bb@amsat.org>
>> > Cc: <iz1dsj@sparks.it>
>> > Sent: Thursday, September 14, 2006 4:56 AM
>> > Subject: Re: [amsat-bb] Re: The Eagle has died.
>> >
>> > > If Eagle dies, so does technoloigy for AMSAT, and the Amateur Radio
>> > > Community!
>> > >
>> > > What is next? Quenched Arc? Spark? 200 KHz and down?
>> > >
>> > > Art ,
>> > > KC6UQH
>> > >
>> > > Hello Art.
>> >
>> > clipped
>> >
>> > > I close with this thought.  Instead of Oscar 40, had the community
>> > gotten
>> > > two more Oscar 13's.  Pretty plain jane birds with not a lot of 
>> > > gizmos
>> > and
>> > > Amsat engineers would have had to have been content with reinventing
>> > the
>> > > wheel...but say instead of AO-40 as a pile of junk we had two more
>> > Oscar
>> > > 13's that worked.
>> > >
>> > > Dont you think it would have been a better deal then we got?  Do you
>> > think
>> > > that there would have been more or less people involved in HEO
>> > > communications?
>> > >
>> > > I think more...and I think that is a good thing.
>> > >
>> > > Robert G. Oler WB5MZO/portable Life member AMSAT ARRL and a few other
>> > > organizatiions.
>> >
>> > I agree Robert
>> >
>> > Much more content satellite users with reinventing the wheel !
>> >
>> > Look at many are actually operating CW and SSB on OSCAR-7 , FO-29 and
>> > VO-52 waiting for the next viable HEO
>> >
>> > 73" de
>> >
>> > i8CVS Domenico
>>
>> Happily, two of the three birds you mention above, AO-7 and VO-52, are in
>> exactly the mode that analog Eagle users will be using, U/V. As I
>> understand it, the plan is to have this link working 24/7. (Yes it will
>> primarily use a software-driven transponder, but that will be transparent
>> to the analog user.) In this regard, I can't see how the design
>> team can be accused of unnecessarily innovating.
>>
>> 73, Bruce
>> VE9QRP
>
> Hi Bruce, VE9QRP
>
> You missed the point because Robert (and I aegree) says that from an
> operational point of view it would much better to have two less costly
> satellite like OSCAR-13 now in orbit but working  instead of a more
> complicaded and costly AO40 not working.
>
> When AO40 died I losted all my satellite friends in the USA and Pacific 
> area
> and you losted all your friends in Europe and so on.
>
> If two OSCAR-13 similar satellites where working now we all will be
> discussing this problems on the air for hours instead to push the keyboard
> on internet and the numbar of satellite users will be larger and having a
> larger number of satellite users means to have big voice and power during
> the IARU and ITU Conferences
>
> On the other side from the techincal point of view if AO40 was not born 
> then
> our knowledge and skill in microwave would be less.
>
> A good balance from the operational and technical needs is necessary 
> because
> radio-ham is not only technical or only operational but a mix of both but
> initially the easy space communication is more important then highly
> technological.
>
> Let at first the amateur community to work worldwide with satellites 
> similar
> to OSCAR-13 and hopefully P3E to prevent that they becames frustrated
> waiting a life in a single FM channel for a new good one after OSCAR-13 or
> AO40
>
> 73" de
>
> i8CVS Domenico
>
>
>
>
>
>
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