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The Automatic Picture Transmission APT system is an analog image transmission system developed for use on weather satellites. It was introduced in the s and over five decades has provided image data to relatively low-cost user stations at locations in most countries of the world. A user station anywhere in the world can receive local data at least twice a day from each satellite as it passes nearly overhead. It only takes minimal effort to check the system from time to time.

In fact, I control the whole computer system remotely from either my main desktop computer or my smartphone utilizing Google Remote Desktop. For Hardware I am running an older desktop computer, running Windows 10 64bit with a 3. See my system diagram here.

For an antenna, I have found that this antenna, which is called a QFH Quadrifilar Helix Antenna antenna, which you can build yourself with plumbing parts, is suitable and works great. Why such a bizarre-looking construct? Here is a simple explanation- Antennas perform best when they are properly polarized, or the antennas are pointed in the same direction in three-dimensional space. When you have a satellite orbiting the earth, even if the antenna is pointed straight down, its polarization to you on earth will change as it goes from horizon to horizon.

The solution is to build an antenna that is properly polarized in all directions, hence the QFH antenna. S o what do these programs do? This Picture is then transferred to MeteorGIS where it combines the channels into several formats depending on your configuration. I added my WxtoImg, Orbitron, and SDR to my Windows Startup directory, that way if the system crashes, or reboots, the software will load and continue to run automatically.

Synch your PC time frequently, or get some software that will do it automatically. BUT I rarely even go up there. I have found that for me, using Google Remote Desktop is just the ticket. I can run all my computers on the second floor, remotely from my comfortable office and computer on the first floor.

I can also run any of them from my Note 9 Smartphone with the Google Remote app! Yes, not everything works all the time, and satellites break, and die. As for fighting, it kind of is true. Space is big, but not that big, and satellites very frequently overlap each other. Or all four sats might be over your location at the same time within a few thousand miles of each other.

WXtoImg has the ability to combine images from multiple ground stations into very wide-area composite images. With images from enough ground stations, it would be possible to produce an image that covered the globe.

Pristine images, available on many websites, and raw images can be downloaded and processed by WXtoImg almost identically to locally recorded images. By obtaining pristine or raw images from other WXtoImg sites, it is possible to create composite images that cover a much wider area than a single ground station could cover. Sites with Pristine images If you are interested in sharing your WXtoImg website, send me the link and I will post it here — email to creinemann gmail.

Pristine images may be downloaded and processed by WXtoImg nearly identically to locally made recordings. That should give your images a boost. Well, like I said I have a number of other "real" radios that work just fine for receiving WX sats with my existing antennas. The RTL dongle just isn't very sensitive. I have a pre-amp but it if comes down to that I'd rather just dust off one of my real radios that have a more sensitive receiver.

A pre-amp won't make the receiver in the RTL any better - it may just help mask the problem, or it could make it worse since a pre-amp will also raise the noise floor which is already really high on these little dongles.

Building a better antenna will probably give more signal gain and have fewer drawbacks than a pre-amp. Adding a new connector will help get a slightly better signal from the anteanna by removing a few db of losses from the adapters - but it's also going to create a whole host of it's own issues I'd rather not deal with. It's a ton of fun for listening to strong terrestrial signals but just isn't great as a ground station for sat work.

It's great for listening to the local repeaters - but can't decode baud APRS transmissions reliably either. I can hear lots of APRS activity - but it never gets decoded.

Most likely the computer I'm using it on is a little underpowered as well which isn't helping. But that isn't to say it's a great radio. You should try soldering a large coaxial connection directly on to the circuit board on the radio. You know NOAA has a web site for this information, right? Good job. That's really fantastic. Will this work around the world or its limited to some countries? Reply 9 years ago on Step 2. That is the reason, so I can put it under my arm. I am now using an Iconia Tab W which is much lighter.

I believe the author suggested this because LCD panels emit strong spikes across a number of frequencies as they operate thanks to harmonic distortion. Given that he has taken the step of wrapping the SDR dongle in foil, I'm assuming he's further doing this to minimize any noise interference. By sdobbie Follow. More by the author:. About: I have no interest in friends, women or men.

Although friends are nice to have, I really could not care less what anyone thinks of me and I can get on perfectly well without friends. Getting drunk, wasted or a… More About sdobbie ». Attachments 29 07 15 Did you make this project? Share it with us! I Made It! Halichoerus grypus Species profile Play audio. Phoca vitulina Species profile Play audio.

Pagophilus groenlandicus Species profile Play audio. Hydrurga leptonyx Species profile Play audio. Ommatophoca rossii Species profile unavailable Play audio. Leptonychotes wedellii Species profile Play audio. Gadus morhua Species profile Play audio. Melanogrammus aeglefinus Species profile Play audio. Play seismic exploration audio. Play audio. Introduction Spectrograms—shown on the right of each image below—are a way to visualize sound, and represent frequency Y-axis over time X-axis.

To play a sound : Click on the audio file link; it will open and play the sound. More On This Topic.



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