[amsat-bb] Re: The Moon is our Future

[Joe]

Now thats pretty good!

But why is it soo good,  when  the HEO birds were soo hard?

something missing?

John B. Stephensen wrote:

>Path loss for a lunar downlink at 435 MHz is 197 dB and the sky temperature 
>is about 75 K. If you assume a 2.5 kHz wide SSB voice downlink and 10dB 
>average SNR (16 dB peak) a perfect receiver needs to see -130 dBm PEP input. 
>Given 5 dBic of gain on the moon and 17 dBic (one long yagi) of gain on the 
>earth, the lunar transmitter needs to provide +45 dBm PEP (32 Watts) per 
>user.
>
>73,
>
>John
>KD6OZH
>
>----- Original Message ----- 
>From: "MM" <ka1rrw at yahoo.com>
>To: <kg4zlb at gmail.com>; <amsat-bb at amsat.org>; "Jack K." <kd1pe.1 at gmail.com>
>Sent: Thursday, July 02, 2009 11:31 UTC
>Subject: [amsat-bb] The Moon is our Future
>
>
>  
>
>>Theoretically we may have a free ride to the Moon for an Amateur radio 
>>repeater!
>>
>>In the past, the flight to the moon for a Amateur radio project has been 
>>cost prohibitive.  We just could not afford to pay for the ride to the 
>>Moon.
>>NASA is going to the moon with unmanned landers. NASA is open to the idea 
>>of flying some public service projects to the moon on their landers.
>>
>>Now there exists the possibility of getting a free ride to the moon, 
>>curtsy of NASA.
>>
>>What we need are the following:
>>
>>A stable club with funding to build a simple transponder project.
>>A plan for a simple transponder (KISS  no complex P3E).
>>A link budget plan for a Moon transponder.
>>
>>
>>One theory:
>>We need a simple Mode-J transponder (2-meters up, 440 down).
>>Low power consumption.
>>Assume minimal antenna gain from the Lander (3 dBd on each antenna)
>>Assume transmitter power 5-10 watts.
>>
>>Questions:
>>What’s the link budget?
>>How much gain will be needed on earth for such a setup?
>>Can we build a working mockup in 1 year or less.
>>
>>The Moon is within Reach.  Let’s Go for IT.
>>
>>Miles WF1F   MarexMG.org
>>
>>
>>--- On Wed, 7/1/09, Jack K. <kd1pe.1 at gmail.com> wrote:
>>
>>    
>>
>>>From: Jack K. <kd1pe.1 at gmail.com>
>>>Subject: [amsat-bb]  Rebuttal -  Re: Unused sats
>>>To: kg4zlb at gmail.com, amsat-bb at amsat.org
>>>Date: Wednesday, July 1, 2009, 4:46 PM
>>>I have to disagree in the strongest
>>>of terms about disregarding HEOs "for
>>>now" which in essence will mean to become forever. Until,
>>>or unless, we
>>>could come up with something along the lines of a "Cell"
>>>system of leos, we
>>>are missing one of the major advantages of Satellites and
>>>that is almost
>>>guaranteed communications for long periods (several hours)
>>>at a time... I am
>>>in no way denigrating LEOs as they have their place, but in
>>>the major schema
>>>of things HEOS will and always have rule given the state of
>>>communications
>>>art...
>>>
>>>I understand the desire to "do something" but I suggest
>>>that the major
>>>thrust should be directed at getting a transponder on the
>>>moon (or Mars) or
>>>some more KISS type HEOs up... Cubesats can take care of
>>>themselves if we
>>>do, Heck I would even join in and participate in something
>>>like I just
>>>mentioned, I just can not get excited about "Contest style"
>>>contacts with a
>>>5-12 min window most of the time... I do that on 2 meters
>>>scatter all I
>>>want,
>>>
>>>DE Jack - KD1PE
>>>
>>>
>>>----- Original Message ----- 
>>>From: "David - KG4ZLB" <kg4zlb at googlemail.com>
>>>To: <amsat-bb at amsat.org>
>>>Sent: Wednesday, July 01, 2009 4:09 PM
>>>Subject: [amsat-bb] Re: Unused sats
>>>
>>>
>>>      
>>>
>>>>All good points but forget the HEO's for now - we just
>>>>        
>>>>
>>>need a good
>>>      
>>>
>>>>source of regularly launched easy sats in LEO to
>>>>        
>>>>
>>>augment the few working
>>>      
>>>
>>>>birds we have and replace what we have to as they fall
>>>>        
>>>>
>>>out of the sky or
>>>      
>>>
>>>>just stop working.
>>>>        
>>>>
>>>_______________________________________________
>>>Sent via AMSAT-BB at amsat.org.
>>>Opinions expressed are those of the author.
>>>Not an AMSAT-NA member? Join now to support the amateur
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>>>      
>>>
>>
>>
>>_______________________________________________
>>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>>Not an AMSAT-NA member? Join now to support the amateur satellite program!
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>>    
>>
>
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