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: [email protected]
To: [email protected]
CC: [email protected]
Subject: RE: [amsat-bb] ESA lunar probe
Date: Sat, 5 Nov 2011 10:59:48 -0500
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: [email protected]
To: [email protected]
CC: [email protected]
Subject: Re: [amsat-bb] ESA lunar probe
Just for the sake of conversation and thinking. What would the link
budget look like for a transponder on the moon.
Bob W7LRD
From: "R Oler" <[email protected]>
To: "Amsat BB" <[email protected]>
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
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
DUBUS Magazine USA Rep [email protected]
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