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sleepsleep



Joined: 05 Oct 2006
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sleepsleep
kinda rough lately on sun surface...

http://www.solarcycle24.com/
Post 17 Feb 2011, 11:39
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edfed



Joined: 20 Feb 2006
Posts: 4237
Location: 2018
edfed
i'd like to be able to capture radio signals from the sky with a résolution (or directivity) of less than pi/(2^16) in all directions, focused in a rotative 320*240 window, at a speed of 2^16 pixels * 24 fps with a dynamic of 8 bits, acquire it from a serial or parralel port, and display it from the VGA mode 13h screen in direct, from my desktop, using a sort of miniature DIY motored radio telescope.

is that possible doctor?
Post 17 Feb 2011, 12:20
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JohnFound



Joined: 16 Jun 2003
Posts: 3500
Location: Bulgaria
JohnFound
Well, AFAIK the sun is pretty calm these days. It is true that we are at the maximum of the current 11 year cycle, but at a whole we are now exiting the "modern maximum" of the solar activity and in the next years, the sunspots will decrease, even in maximums of the 11 year cycle.
Post 17 Feb 2011, 12:23
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17251
Location: In your JS exploiting you and your system
revolution
edfed wrote:
i'd like to be able to capture radio signals from the sky with a résolution (or directivity) of less than pi/(2^16) in all directions, focused in a rotative 320*240 window, at a speed of 2^16 pixels * 24 fps with a dynamic of 8 bits, acquire it from a serial or parralel port, and display it from the VGA mode 13h screen in direct, from my desktop, using a sort of miniature DIY motored radio telescope.

is that possible doctor?
Sure it is possible, but you will need a lot of antennae, one for each of the 2^16 points on the sphere. Think of it like a very large RF version of a CCD camera, but instead of a transistor sensitive to light you have an antenna sensitive to RF.
Post 17 Feb 2011, 12:32
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edfed



Joined: 20 Feb 2006
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edfed
it would be possible with a single high speed motorised antenna no?
Post 17 Feb 2011, 13:56
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17251
Location: In your JS exploiting you and your system
revolution
edfed wrote:
it would be possible with a single high speed motorised antenna no?
In theory I suppose, yes. But I would hate to be near the thing when it is operating, it would be lethal. Although perhaps on second thought, maybe the sheer speed of the thing means it has to withstand 10s of 1000s of g's of centripedal force? Maybe no material exists that can withstand? Plus the flexible connection cabling to the receiver would be "interesting".
Post 17 Feb 2011, 14:07
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edfed



Joined: 20 Feb 2006
Posts: 4237
Location: 2018
edfed
motored means rotative.
and only rotative.
something like the radar, the antenna just rotates on 1 axle but here, make it rotate on 2 or 3 axles can be cool, somethig like a gyroscope.
and for the communication, just use something like conductive tracks.
Post 17 Feb 2011, 14:12
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matefkr



Joined: 02 Sep 2007
Posts: 1291
Location: Ukraine, Beregovo
matefkr
you could have a disk, on wich there is a track, from the center to the edge of your disk, and at the edge end of track there is a spring, you would have a head wich could engage the track and the head would be tiltable. you turn the disk perpendicular to the desired direction, and as you speed up the disk, centrifugal forces force out the haead, so tghe had would basically spiral out. you would have to alternate sampling rate according to movement speed of head. this way, you only have to slow and accelerate (in pairs) 25 times a second, plus the spring would help return to the middle. im not sure if the ports you mentioned are fast enough. also what will be the wave lenght?


maybe you are better off with slower framerates.

but you could use some way to cancel on parts of your antenae waves coming from a not desired direction, but here you need to be pro radiotechnician.
Post 17 Feb 2011, 15:15
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Madis731



Joined: 25 Sep 2003
Posts: 2141
Location: Estonia
Madis731
http://www.physics.berkeley.edu/research/zettl/projects/nanoradio/radio.html
You can have this device in the near future. The only problem with 360-by-360 view of the world is than you must put a cable or a chassis somewhere and that doesn't make it perfect Razz

Maybe you can put all the technology that processes it inside? Then WiFi it out and disturb the signals coming in. All the problems that arise....excite me Very Happy
Post 19 Feb 2011, 18:30
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sleepsleep



Joined: 05 Oct 2006
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sleepsleep
Massive Prominence Eruption / CME June 7 , 2011

this is a must watch Smile
http://www.youtube.com/watch?v=hpQmS3adLgI
Post 07 Jun 2011, 19:13
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nop



Joined: 01 Sep 2008
Posts: 165
Location: right here left there
nop
sleepsleep wrote:
Massive Prominence Eruption / CME June 7 , 2011

this is a must watch Smile
http://www.youtube.com/watch?v=hpQmS3adLgI
scary to see the sun unstable like that like it could actually explode and it would be the last thing we would ever know Shocked earth would fit into that little hole that opened up on the surface
Post 08 Jun 2011, 02:15
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xleelz



Joined: 12 Mar 2011
Posts: 86
Location: In Google Code Server... waiting for someone to download me
xleelz
Quote:

scary to see the sun unstable like that like it could actually explode and it would be the last thing we would ever know earth would fit into that little hole that opened up on the surface


Well, ain't you just a ray of sunshine? Neutral
Post 08 Jun 2011, 02:45
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