Can the transmissions on X-band be lengthened ? Or duplicated ? There will be more chance for possible tuning. This is the first time.
Ok. We will work on it. Hopefully first time will be lucky:)
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How stable is the transmitter, and how much power does it put out? (i.e should we tune higher or lower to compensate for receiver/transmitter instablility?)
FANTASTIC!!! Looks way up north. @geoscan I was wondering would it be possible to capture auroras at the poles?
From this observation at 15:33 UTC using a static 5-element yagi pointed north @ ~ 45 deg elevation. Processed using @SA2KNG geo-scan
Mostly clouds as a storm front is sweeping across the central/east USA.
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oooooo looks pretty strong⌠need to check that one out
I decoded only 4 dat files without jpg.
Writing to: o_0.dat
Writing to: o_1.dat
Writing to: o_2.dat
Writing to: o_3.dat
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I will also give this a try, earlier tries also only produced .dat files and no .jpg.
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What kind of camera is Geoscan using? Would it be possible to transmit images with less jpeg compression or higher resolution, or is that encoded by the camera hardware?
Itâs in the datasheet online. I donât think itâs possible as this is an engineering camera.
As far as I can see, that was not a image. None of the start frames contain a jpg header. It looks like the same file is transmitted twice, and compromised of 2 16k blocks for a 32k total.
file says 2022-12-01.dat: OpenPGP Public Key
2022-12-01 10:32:34|01003E010900800B987D00005A9DB63100000110216700102DE9F04FAD4BB0F802C0B3F87E805A6BB3F882400688C58AC788B0F804B0B0F814E0C8F56B4991B0
2022-12-01 10:30:49|01003E010900800B987D00005A9DB63100000110216700102DE9F04FAD4BB0F802C0B3F87E805A6BB3F882400688C58AC788B0F804B0B0F814E0C8F56B4991B0
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eNcRyPtIoN??? Hehe this is getting interestingâŚ
Interesting⌠I donât know what may cause this transmission. Definitely should be image. But as it wasnât might be my mistake and i transmitted junk. That is most possible
This was junk transmitted twice:(
I should check if Cubesat made an image there
We donât use encryption. We are in radio-amateur satellite space service:)
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Image transmissions and X-band transmissions should be tested a little more time. I will try to schedule more transmission in both bands this weekend or following week
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I am curious, is it possible to turn IQ recording of transmission to an image with one script? (Input.wav â Output.jpg)
I am asking this so maybe we could think of one protocol of jpg images transmission from space. So radio amateur satellite could implement it in future. And we will have jpg files (or other format) decoded SatNOGS, as weather satellites working right now. Or maybe there is some protocol already?
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It probably would not be practical to develop a script like that from the ground up since gr-satellites already has countless hours of effort and care put into it to provide the best results possible, but it could be quite easy to make a script that simply utilizes gr-satellites and gnuradio to automate the entire process going from .wav to .jpeg
I already began work on something like that for jpg transmissions from Lucky-7 cubesat, Geoscan probably wouldnât be much different but as far as I can tell there is no description of its telemetry format, specifically how individual frames are counted. From what it seems there isnât a simple binary counter that can be used to sort the frames, instead it looks like Geoscanâs frame counter is coded differently.
@SA2KNG suggests the Geoscan counter is using a different Endianness, but no matter what I try I canât seem to figure it out
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