Tag Archives: Ka-band

Astra 1N Launch tonight

Hi everybody! 

Tonight at the NewConceptsCafé…

 We remind you that tonight will be launched the ASTRA 1N satellite from French Guiana with an Ariane 5. You can follow live online using the link below:

http://www.videocorner.tv/videocorner2/live_flv/index.php?langue=en 

The launch window begins at 11:43 PM tonight.

If you have never seen a launch I think i’ts quite interesting.
 
If everithing goes well, the Astrium-built Astra 1N will be soon  operating with more than 50 active Ku-band transponders. It has a takeoff mass of 5,300 kilograms and the electrical power produced by its solar panels is 13 Kw. over its lifetime of 15 years. The satellite also has the participation of CASA Espacio, namely the FSA’s have been provided. 

The Ariane 5 also has the usual elements provided by CASA Espacio as the Payload adapter.

Via EADS CASA (Communication Department).

More info:

http://www.astrium.eads.net/en/news2/ariane-5-to-launch-astra-1n.html

http://www.ses-astra.com/business/es/news-events/news-latest/index.php?pressRelease=/pressReleases/pressReleaseList/11-07-01/index.php

http://www.ses-astra.com/business/en/extranet/blog-astra-1n/index.php#18867016

KA-Sat starts emitting in KA-Band


Welcome to our new Café! After a redesign the NewConceptsCafé opens again!

Since the Café was opened, one of the most clicked posts has been the one referred to the KASAT emitting in KA-Band. Well, it started to work successfully ten days ago as I discovered reading one of my favourite blogs: GIZMAG.
Currently I’m working in a new Ka-Band satellite so I can imagine the difficulty of this design.I’ll try to explain easily how it’s made and how it works.

The satellites usually flight inside a launcher. Depending of its weight and size it will flight in a different one.
The most used are:

- The Ariane 5

- The Proton

- The Soyuz

The satellite goes inside the top part of the rocket as payload and obviously it must fit inside. That’s the reason why everything is folded.

HERE you can find some interesting images.

There are two different efforts that a satellite must hold. The launching and the thermal efforts once is placed in orbit.

The first one is mainly induced by the vibrations of the launcher engines. It can reach values over 100 G in some parts.

Once the satellite is in orbit, the gravity and the centrifugal forces are equilibrated and so it does not feel any gravitational effort. But its new enemy is the sun. The difference between a radiated and no radiated part can go from -180 to 180 degrees. That means extreme parts solicitations by dilatation. That’s the reason why satellites are covered by a sunshield. This sunshield prevents from direct sun exposure but also keeps radiation rebounding inside heating more equally the different parts. There is a minor thermal gradient. It’s important to add that the sheet that works as sunshield must be transparent to the frequencies that the satellite uses to emit and receive. In this case, as a Ka-Band satellite these frequencies are: 26.5 to 40 GHz

Before deploying all the reflectors and the solar panels are clamped to the satellite body to avoid bad behaviours and cracks during the launch.

The most used mechanism to detach the parts from the satellite are the pironuts. Pironuts are explosive nuts that. Once they explode they release the extra clamps letting the ADPMs (Antenna Deployment and Pointing Mechanism) motors drive reflectors and solar panels to its final position in the satellite flight configuration. Now, the ADPMs and the satellite attitude control work together to reach the correct pointing to targets on earth.

The KA-Sat it’s a multi-spotbeam satellite so it must point to all the coloured circles you see in the picture. This means a little metallic horn pointing to a main reflector to rebound and amplify the signal. In this case it has 82 horns (quite a lot). The horns are really close to each others as you can see in the picture (are the white cup-shaped parts you can see in the top of the satellite in the picture below) In this case it seems that there are four arrays, 2 per reflector.

The complexity of the parts to produce and assemble can only be intuited by looking a this part that can represent a 1% of the total satellite systems.

So happily we have our new satellite emitting and allowing the not ADSL covered zones to reach a good transfer speed in their internet conections.

And of course giving extra tools to SKYNET to control us :-)

Ariane5 flight #197 W3B satellite launching failed

 

This morning I wake up with good news Reading about the successful #197 flight of the Ariane5

Bad news my friends. The W3B satellite from Eutelsat failed and is lost in the space. It´s the second satellite they lose…

http://www.eutelsat.com/news/compress/en/2010/html/PR4810W3Bloss-post-launch/PR4810W3Bloss-post-launch.html

KA-SAT satellite emitting in KA-Band

Sometimes, after closing the NewConceptsCafé, I like to go to the mountain, far away from the city, under the dark sky, and enjoy looking though a friend’s telescope that he built on his own. I have seen the moon, binary stars and transits across Jupiter. It’s amazing how things change when you change your point of view.

A month ago I started working on the development of a new satellite in EADS CASA ESPACIO. My team is focused on the design of the antennas. As you can imagine I’m learning a lot of new things. It’s a complete new world f or me and a pretty challenge.

This week has appear in ‘EL PAIS’ newspaper an article about the new KA-SAT, it´s a very interesting solution for people of the interior of Spain among other things. I didn’t know that there were parts of Spain without ADSL. So the satellite is thought to bring access to all the people that still live in 56Kbps century.

In fact, the KA-SAT is the first satellite operating exclusively in Ka-band frequencies EADS ASTRIUM has done. It will help to increase the Europe and Mediterranean broadband possibilities.


Here you can see a Ka-Band feeder cluster:

‘KA-SAT
Ordered by Eutelsat from EADS Astrium, KA-SAT is scheduled for launch between November 2010 and January 2011. Entirely innovative in design, the satellite will be configured with over 80 spotbeams, with a network of eight ground stations connecting to the Internet backbone.

The KA-SAT programme is to deliver efficient resources for the mass-market delivery of the Tooway™ consumer broadband service, targeted at users across Europe and the Mediterranean Basin located beyond range of ADSL networks. With a throughput of over 70 Gigabits per second, KA-SAT will be capable of serving over one million users who expect bandwidth and prices comparable to ADSL2 performance.

Eutelsat will also drive the development of satellite-based consumer broadband services with triple-play capability, by combining broadband services in the Ka-band, through KA-SAT, with the reception of TV channels in the Ku-band. In order to facilitate the availability of high-performance triple-play equipment at competitive prices, Eutelsat will deploy the KA-SAT satellite to 9° East. This deployment will simplify production of dual-feed antennas transmitting and receiving broadband services in the Ka-band from 9° East, and receiving television in the Ku-band from Eutelsat’s flagship HOT BIRD™ neighbourhood at 13° East.

 

 

Follow this links to know more…

 

UPDATE!!! visit this link for further information

http://www.eutelsat.com/satellites/upcoming-launches.html
http://www.lyngsat.com/launches/ka.html
http://en.wikipedia.org/wiki/Proton_(rocket)
http://diesl.com/blog/?p=26962