[amsat-bb] Re: ESA lunar probe

[Edward R. Cole]

At 09:11 AM 11/5/2011, R Oler wrote:

>I wrote:  (and the time delay makes it well a unique form of 
>transportation)..transportation should obviously be "communication".
>
>the reality of a lunar transponder (or even a packet system) would 
>be that it would encourage a lot of things that the FM sats do 
>not...and discourage a lot of bad things...it wont happen I know 
>because of a lot of reasons...but it would change our hobby and the 
>satellite part of it for the better.  RGO WB5MZO life member AMSAT ARRL NARS
>
>sent from my IPAD
>
>From: orbitjet at hotmail.com
>To: w7lrd at comcast.net
>CC: amsat-bb at amsat.org
>Subject: RE: [amsat-bb] ESA lunar probe
>Date: Sat, 5 Nov 2011 10:59:48 -0500
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>Bob...its been done here a zillion times...it wont be done with an 
>HT and a small yagi...it will however be possible whereas a "Mars" 
>effort is really not possible for anyone except "Goldstone class" 
>stations (and the time delay makes it well a unique form of 
>transportation).  A small linear transponder with some horizon omni 
>gain antennas would be a challenge, but it would be easier then 
>moonbounce Robert G. Oler WB5MZO life member AMSAT ARRL NARS
>
>Date: Sat, 5 Nov 2011 06:54:32 +0000
>From: w7lrd at comcast.net
>To: orbitjet at hotmail.com
>CC: amsat-bb at amsat.org
>Subject: Re: [amsat-bb] ESA lunar probe
>
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>Just for the sake of conversation and thinking.  What would the link 
>budget look like for a transponder on the moon.
>
>Bob W7LRD
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>From: "R Oler" <orbitjet at hotmail.com>
>To: "Amsat BB" <amsat-bb at amsat.org>
>Sent: Friday, November 4, 2011 4:10:00 PM
>Subject: [amsat-bb] ESA lunar probe
>
>
>http://www.bbc.co.uk/news/science-environment-15574653
>
>to bad there cant be an amateur radio payload even a really small 
>one...this probe should be "longer lived" then most as it should 
>have a constant energy source...
>
>Wonder why the Europeans are thinking of sending Phase 5A to 
>Mars?  It will probably never fly and almost no hams can be a part 
>of that...so well why not send it to L2 in the Earth Moon 
>systems...a halo orbit...
>
>Robert G. Oler WB5MZO Life Member AMSAT ARRL NARS
>

Using my MRO Calc program:
http://www.kl7uw.com/MROCalc.xls

with 10w output
6 dBi antenna on the Moon (e.g. corner reflector)
average lunar distance = 370,000 km
ground receive antenna gain = 18 dBi (e.g. M2-436CP42)
Rx NT=40K
Tsky=70K
Tant=40K
Freq. 437 MHz
bw =4.7Hz for JT-65
a signal of -23 can be seen (which is fairly good signal level for 
reception of JT-65).



73, Ed - KL7UW, WD2XSH/45
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