Remote Imaging 1992 /1994

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Remote Imaging 1992 /1994

Postby Harry Dalek » Sat Mar 02, 2024 10:03 pm

Scanning some magazines pages on the subject ,before they hit the bin a little easier there days using first a scanner radio and just the PC sound card and these days SDR USB radios , The weather satellites are going digital which is a bit more complex to receive and decode an image from them but a few of the old analog sats are still kicking
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Live online tracking where are they right now .
https://wxtoimgrestored.xyz/satellites/
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Remote Imaging 1992 /1994

Postby BruXy » Sun Mar 03, 2024 12:19 pm

Nice find Harry, thank you for scanning and posting, shortly I will add it to my online archive. Just today I found, that there was a journal SPEC-COM about SSTV, FSTV, satellites, and digital communication available a long time ago:

I found a few numbers here:

https://archive.org/details/texts?tab=c ... y=SPEC-COM

It is fun to read it almost 30 years later: complaints about too many SSTV modes, different incompatible EPROMs for Robot 1200C and LM9000, or proposal of open SSTV modes that will be able to progressively display pictures during the reception :twisted:
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Re: Remote Imaging 1992 /1994

Postby Harry Dalek » Sun Mar 03, 2024 3:47 pm

BruXy wrote:Nice find Harry, thank you for scanning and posting, shortly I will add it to my online archive. Just today I found, that there was a journal SPEC-COM about SSTV, FSTV, satellites, and digital communication available a long time ago:

I found a few numbers here:

https://archive.org/details/texts?tab=c ... y=SPEC-COM

It is fun to read it almost 30 years later: complaints about too many SSTV modes, different incompatible EPROMs for Robot 1200C and LM9000, or proposal of open SSTV modes that will be able to progressively display pictures during the reception :twisted:


Thanks BruXy no worries ,not seen that magazine before, looking at one on Geo weather satellites i wanted to get into those even got a LNA for it at the time and made the feed horn i am not sure why i never got further still have the LNA i think it was good for NOAA 3km High-Resolution Rapid Refresh (HRRR) frequency ..
There were a lot of SSTV modes i suppose now its stuck on digital ..i like the earlier simple modes .
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Remote Imaging 1992 /1994

Postby Steve Anderson » Sun Mar 03, 2024 5:02 pm

Harry Dalek wrote:There were a lot of SSTV modes i suppose now its stuck on digital ..i like the earlier simple modes .

Yes, mainly digital, I might be wrong, but the PD modes seem to be becoming a 'sort of' de facto mode. I have no problem with that, as long as it doesn't degenerate into a shambles similar to the analogue farce of the 70s/80s. The few (five or so) digital PD modes are enough. End of sermon.

I tend to stick with the SSTV mode very similar to the 'original' Cop McDonald FM system. The real 'original' SSTV system was an AM subcarrier prone more to interference on HF. Conceptually similar to the preservation of 405-lines primarily in the UK, as well as 30/32-line NBTV here and within the NBTVA.

Although there may be a significant amount of digital processing in the original Cop McDonald system today, the final signal sent from user-to-user is analogue, thus can be displayed on something built in the 70s.

Steve A.
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Re: Remote Imaging 1992 /1994

Postby Harry Dalek » Tue Mar 05, 2024 2:30 pm

Steve Anderson wrote:
Harry Dalek wrote:There were a lot of SSTV modes i suppose now its stuck on digital ..i like the earlier simple modes .

Yes, mainly digital, I might be wrong, but the PD modes seem to be becoming a 'sort of' de facto mode. I have no problem with that, as long as it doesn't degenerate into a shambles similar to the analogue farce of the 70s/80s. The few (five or so) digital PD modes are enough. End of sermon.

I tend to stick with the SSTV mode very similar to the 'original' Cop McDonald FM system. The real 'original' SSTV system was an AM subcarrier prone more to interference on HF. Conceptually similar to the preservation of 405-lines primarily in the UK, as well as 30/32-line NBTV here and within the NBTVA.

Although there may be a significant amount of digital processing in the original Cop McDonald system today, the final signal sent from user-to-user is analogue, thus can be displayed on something built in the 70s.

Steve A.


Yes i think so ,Chris long uses it each day for he's group on VHF .
The digital part could also be called delayed SSTV , 100 % digital ,via radio perfect or nothing system result like an on and off switch .
I still rather analogue nothing to perfect like a staircase least its there.
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Remote Imaging 1992 /1994

Postby BruXy » Wed Mar 20, 2024 11:51 am

Just FYI, added to the archive: https://bruxy.regnet.cz/hamradio/SSTV_L ... AX,_WXSAT/ (with other WEFAX related articles).
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Re: Remote Imaging 1992 /1994

Postby Harry Dalek » Sat Mar 30, 2024 1:01 pm

BruXy wrote:Just FYI, added to the archive: https://bruxy.regnet.cz/hamradio/SSTV_L ... AX,_WXSAT/ (with other WEFAX related articles).


Funny enough i own the 1.7Ghz LNA in the ARA link posted i had it made for me around 1990 to 93 from memory never got around to using it got to take your time and think about these things 30 or so years later ! :roll: and am about to try and use it soon .
Have a free 2m satellite dish i fixed see the poor state it was when i got it the last owner was just renovating an old house wanted it gone looks like he let it drop from that pole height ...
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Bit of work and Bashing back into shape the old girl is back mounted back at my place ,i was thinking of checking the C Band these days and making a Can feed horn antenna for the 2 or 3 Geo weather satellites in my neck of the woods using that LNA it runs on 12v and feeding that via a DC blocking cap to my SDR .
I have more stuff on this old system i can scan ..... i have no idea if the LNA i had made all those years ago still works sealed up in its water proof pvc case but looks like its close to being used now i have a dish again ..
I will look into scanning the documents
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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Re: Remote Imaging 1992 /1994

Postby Harry Dalek » Sat Mar 30, 2024 4:34 pm

More on the early days of picking up geo satellites pretty much early Television or weather satellites there were no places to buy Dishes or you had to be wealthy only other way was make your own.

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Scanned some early 90s PH communications information when i was getting interested in Geo sats and still am 8)

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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
User avatar
Harry Dalek
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Posts: 5383
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Re: Remote Imaging 1992 /1994

Postby Harry Dalek » Sat Mar 30, 2024 4:55 pm

A little show and tell of the other gear i have and i plan to use now below the S band gear The can feed horn 2 Ghz S band and the LNB it converts the S Band down to this 54 to 814 MHZ
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I plan to also use these gate openers instead of actuators to move my dish
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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Re: Remote Imaging 1992 /1994

Postby Harry Dalek » Fri Apr 12, 2024 10:38 am

I would like to do some antenna dish control which i could do simple ,Using DC motor gears as shown past post but a goal would be PC control .\
Every thing i have seen of late uses a PC with a arduino or arduino on its own what i don't understand is why a pc needs another mini pc to do the work i would think a PC could handle the job on its own seems to be the case on cnc machines .'
Any case anyone have any ideas a goal would be either dish positioning or in time satellite tracking ,i am thinking of starting off with power supply relays and switching very simple which could be added onto .
On the Software side later on orbitron can do it https://www.stoff.pl/
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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