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#31
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Moon Bounce
To heck.
cuhulin |
#32
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Moon Bounce
On Mon, 24 Oct 2005 07:58:12 GMT, "Frank Dresser"
wrote: "matt weber" wrote in message .. . On Sun, 23 Oct 2005 08:13:45 GMT, "Frank Dresser" wrote: Having it pointed straight up is the standard stowed position. At lot less load on the mounting that way. However it could just as easily be a tropo scatter antenna, and tropo scatter has the advantage that the moon doesn't have to visible at both ends of the path. Wouldn't a moonbounce setup, with high power and a steerable antenna, also have tropo scatter capability? It wouldn't necessarly go the other way, however. Equipment which works well enough for tropo scatter might not do the moonbounce job. Tropo is probably harder than Moonbounce. That's one of the reasons there was no civilian use of Tropo. Amateurs were using 1 Kw in the 1950's in the 6 meter band. Admitted very limited bandwidth, but Tropo needs tens of kilowatts. I don't doubt the antenna was capable of Moonbounce, but by the mid 1960's, there wasn't a good reason to use Moonbounce any longer. The geometry had to line up, so you might have wait a long time (12 hours or more if you were unlucky), whereas a Sat was almost guaranteed to come into view in a few hours, and if the military had bought capacity on Syncom (and I have no idea if they did or didn't), they wouldn't have to wait at all... |
#33
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Moon Bounce
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#34
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Moon Bounce
"matt weber" wrote in message ... Wouldn't a moonbounce setup, with high power and a steerable antenna, also have tropo scatter capability? It wouldn't necessarly go the other way, however. Equipment which works well enough for tropo scatter might not do the moonbounce job. Tropo is probably harder than Moonbounce. That's an overgeneralization. There's no way it would be easier to moonbounce a signal to a location 20 miles over the horizon than it would be to use tropo scatter. That's one of the reasons there was no civilian use of Tropo. Amateurs were using 1 Kw in the 1950's in the 6 meter band. No civilian use as of when? The 1964 ARRL handbook says: "Tropospheric scatter is prevalent all through the v.h.f. and microwave regions, and is usable over distances up to about 400 miles." The 1955 handbook also mentions tropospheric propagation at vhf and above, but isn't so specific. The biggest problem with early vhf work wasn't a lack of power or insufficently high gain antennas, it was unstable oscillators. Those oscillators drifted, and the radios had to have an otherwise excessively wide IF bandwidth in order to allow for the drift. Getting a very narrow CW bandwidth at vhf, for a decent signal to noise ratio, was almost impossible. By the way, the 1983 handbook says: "Most EME signals tend to be near the threshold of readability, a condition caused by a combination of path loss, Faraday rotation and libration fading." It seems early 60s radio amateur equipment would work for tropo scatter, up to about 400 miles. A later generation of such equipment would have to work signals near the threshold of readability. Admitted very limited bandwidth, but Tropo needs tens of kilowatts. The ARRL says different. I don't doubt the antenna was capable of Moonbounce, but by the mid 1960's, there wasn't a good reason to use Moonbounce any longer. The geometry had to line up, so you might have wait a long time (12 hours or more if you were unlucky), whereas a Sat was almost guaranteed to come into view in a few hours, and if the military had bought capacity on Syncom (and I have no idea if they did or didn't), they wouldn't have to wait at all... There was, and is, a very good reason for the military to have moonbounce capability. Things go wrong. Things break. Things get attacked. The more options we have, the better chance we have to keep a bad situation from getting totally fouled up. That's true, even for very difficult options like moonbounce. Frank Dresser |
#35
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Moon Bounce
I wonder if Moonbounce had anything to do with www.kagnewstation.com
in Africa.Luke lives in Hattiesburg,Mississippi and he sometimes post at www.pipelinenews.org (it might be a dot com) and he worked in deciphering radio messages at Kagnew Station.Although Kagnew Station was/is U.S.Army. cuhulin |
#36
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Moon Bounce
There was an ATT commercial Tropo link from Florida Keys to Cuba for
years. 900 MHz I think. The huge dishes (a pair) were standing for years off Card Sound road. Probably gone now. I wish I had thought to play radio using the feed point. Probably great 2 meter tropo DX on the ham band! Tropo is probably harder than Moonbounce. That's one of the reasons there was no civilian use of Tropo. Amateurs were using 1 Kw in the 1950's in the 6 meter band. Admitted very limited bandwidth, but Tropo needs tens of kilowatts. I don't doubt the antenna was capable of Moonbounce, but by the mid 1960's, there wasn't a good reason to use Moonbounce any longer. The geometry had to line up, so you might have wait a long time (12 hours or more if you were unlucky), whereas a Sat was almost guaranteed to come into view in a few hours, and if the military had bought capacity on Syncom (and I have no idea if they did or didn't), they wouldn't have to wait at all... -- Joe Leikhim K4SAT "The RFI-EMI-GUY" The Lost Deep Thoughts By: Jack Handey Before a mad scientist goes mad, there's probably a time when he's only partially mad. And this is the time when he's going to throw his best parties. |
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