[amsat-bb] Re: S-Band and Eagle

Luc Leblanc VE2DWE lucleblanc6 at videotron.ca
Wed Sep 13 06:59:00 PDT 2006

On 12 Sep 2006 at 17:18, ANTHONY JAPHA wrote:

Hi Anthony

Your actual setup is OK on LEO but with an HEO even in V/S mode i doubt it will be enough. By 
definition to be able to work an HEO you need more than a portable station. Your setup can be doing 
the job when the satellite will be at close range but it will be much more harder near apogee.

I don't know what you have to receive the IF of your AIDC downconverter? here i have the same 
downconverter and ALL the QRM on S band disappears as soon as i switch the noise blanker on. With a 
S-9 noise level on 2.4ghz mainly from cordless phone frequency hopping type and Wi-FI the noise 
blanker reduce this noise level to half a s unit with the antenna over 5 degree elevation and 1 or 
2 s units from 0 to 2 S units. 

 The bird can be directly overhead, but only the rare station pops
> up out of the noise for a few syllables at a time.

  The fact that some stations can make it through a tough QRM
> situation isn't very convincing.  It is the great majority of stations that
> should be able to use the bird.  

I am sorry to tell you you need more than a portable setup to be able to work an HEO and its not 
because you have a marginal setup you should concluded that the rest of the world is in the same 
situation. It is unfortunate that you cannot work on AO-40 you probably will have a very different 
argumenting. I unnderstand your lack of experience working on HEO but if you rely solely your 
opinion without having any experience on HEO work and based on less than desirable setup for an HEO 
i understand why you are making thoses statements!

Here another commenting made by an "EXPERIENCE USER" :


If local noise was a problem for you it was not a problem for the world wide
majority of  S-downlink users

Best 73" de

i8CVS Domenico

Here is a note about the Mode B requirements on Eagle

"The Mode B transponder will require no more than AO-13 required unless 
you want to use the new text messaging service and that will require a 
sound card and a computer."


Do you have an idea of what he mean about an AO-13 setup?

> I have a couple of concerns.  Is the emphasis on making the bird accessible
> to very modestly equipped stations (like mine?!) going too far?   The
> bird's potential use in emergencies sounds farfetched to me.  Maybe if
> we're down to a choice between the bird and a semaphore!

The S/C mode will be experimental and the idea behind making an HEO in this mode an emergency ready 
sat is not realistic of the condition who prevails in an emergency situation. In my 30 years of 
hamming i learn if you live in an apartments building at the 10th storey you will have a lot of 
restriction in your type of operation.

At the risk of repeating myself  "again" you will have an S band on P3E and the Eagle main builders 
openly admitted they don't want to build "another AO-40" and they are hiding behind the AMSAT-NA 
"vision" where they contribute to implement to do what they want "as usual" going to a point to 
blackmail the whole amateur community.


I suspect P3E will fly the intended payloads if the microwave developers 
deliver their modules. 

I am not interested in flying a carbon copy of P3E 
when I know it makes no sense whatsoever.   I am 52 years old and one of 
the most active technical contributors in all of amateur radio.  I will 
not waste my time doing what I know in my heart and my head is not in 
the best interests of amateur radio even if it is currently perceived to 
be for the good of  the shrinking aging membership of AMSAT

I can added a lot more here but for the sake of what we called here civilities i let the AMSAT-NA 
membership with the conclusion.

And i hope you can see things differently now...i said i hope!

The medium is the message...The content is the audience...;)

Luc Leblanc VE2DWE
Skype VE2DWE

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