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View Full Version : I'm wondering about an amateur radio Earth-Venus-Earth bounce or MoonBounce?



Launch window
2018-Jul-16, 03:51 PM
I'm wondering about an Amateur Radio Astronomy, I talked with met some people last yr Americans, Canadians, Europeans some Greek from Crete I think he collected a lot of stuff and I get service is probably still compulsary so a lot of them probably know or have access to certain things even if they are not engineers the topic of bouncing a singal off the Moon or Venus was a very interesting one.

Not sure where to post this it could be better in, Equipment and Accessories? Might ask a mod to move this later if it doesn't get responses

What kind of amateur equipment would be needed, what power amplifiers and motors would be needed and what kind fo singal loss or static or thermal noise floor. I'm guessing if you had acess to a big dish would be a benefit or build maybe your own tower or Yagi. Someone else was saying to bounce a single in maybe 1.3 Ghz to 1.2 GHz or 1.42 GHz I think there are a lot of groups or clubs around the world that cover this stuff maybe show how to make your homemade dish and what software to use and what amateur signals you can save to your computer or website? I'm not really sure where to start

schlaugh
2018-Jul-16, 04:03 PM
Well, you might start with the Society of Amateur Radio Astronomers (SARA).

http://www.radio-astronomy.org/
http://www.radio-astronomy.org/getting-started

profloater
2018-Jul-16, 04:12 PM
I know someone who does VHF moon bounce with a large vehicle mounted Yagi and for him the ultimate is to get a horizon bounce so a friend the other side of the world can pick up the signal. I think a Venus bounce would be hugely difficult on VHF because of distance and atmosphere.

profloater
2018-Jul-16, 04:14 PM
here is a link about it
http://history.k4lrg.org/Projects/K4MSG_EME/

glappkaeft
2018-Jul-16, 04:59 PM
Well, you might start with the Society of Amateur Radio Astronomers (SARA).

http://www.radio-astronomy.org/
http://www.radio-astronomy.org/getting-started

It's more of a ham radio amateur thing although there could be an overlap with amateur radio astronomers. I doubt EVE is practical for communication (ultimate bragging rights though if you pull it of - http://www.qsl.net/dl4yhf/speclab/earth_venus_earth.htm - 20 m dish though) but I meet more than one ham radio operator who have done a moon bounce.

https://en.wikipedia.org/wiki/Earth%E2%80%93Moon%E2%80%93Earth_communication

tlbs101
2018-Jul-23, 04:45 AM
One of my students, for his senior Science Fair project (asteroid deflection) actually built a special horn antenna and hooked 4 microwave oven magnetrons to it. We used my neighbor’s old 3m satellite dish and a custom built receiver (thank you Mini-Circuits for your free samples). It was probably illegal as heck, but we sent several CW pulses to the moon and got a response at the dish. He never did do a beam width measurement on the horn so we couldn’t calculate the path power losses.

profloater
2018-Jul-23, 08:33 AM
wow a 3m satellite dish? And four magnetrons? He could have done the beam width by melting chocolate bars!:p

profloater
2018-Jul-23, 09:12 AM
One of my students, for his senior Science Fair project (asteroid deflection) actually built a special horn antenna and hooked 4 microwave oven magnetrons to it. We used my neighbor’s old 3m satellite dish and a custom built receiver (thank you Mini-Circuits for your free samples). It was probably illegal as heck, but we sent several CW pulses to the moon and got a response at the dish. He never did do a beam width measurement on the horn so we couldn’t calculate the path power losses.

I am now wondering how four magnetrons can be synchronised, do they self synchronise in the wave guide of do they cancel each other? I used to supervise student projects like that but never tried a microwave beam, Great idea for a moon bounce .

profloater
2018-Jul-23, 09:20 AM
oh and a note to students: do not mess with microwave ovens' insides without knowing the dangers. The capacitor inside can kill you.