RF Circuit Design Lecture

Nice lecture about RF circuit design from practical point of view, Michael Ossmann is the one created HackRF one which is SDR (Software Defined Radio) RF transceiver board that has wide frequency range up to 6 GHz. Lecture gives tips from one in the field of designing/mastering RF circuit design.

Just note, even this is a practical guide, you still need to have knowledge about the concepts like PCB, Impedance and impedance matching, filters.

I like in this lecture it always mention that take the easiest way to give you the best result, like: Always use integrated circuits, use recommended components from manufacturer for passive elements, always use ready made filters available don’t go for design (except you really can’t find another way), always match to 50 Ohm and choose IC based on that, always match impedance on 50 Ohm.

In future, I may practice some PCB/SBC/RF SDR circuit design so that’s why I started to start learning from in the field masters.

Enjoy the lecture

 

 

Dropbox vs. Ubuntu One

Dropbox and Ubuntu One are Cloud service that provides storage service of folders and enable you to sync them between multiple machines. In old days, i was sending files to myself by emails to have the same files on different machine.

Dropbox offering free 2GB storage with the ability of sharing folders between different users, or publish certain files to the public (like publish certain images and put in a website or blog or send a link to it to a friend). Dropbox can be used on Linux, Windows, MAC and Mobile.

Ubuntu One is nearly the same but offering more free space of 5 GB, but runs only on Ubuntu 10.10 or newer, Windows and MAC OS not yet supported. So they offer more space but make sure all your machines on your cloud should be Ubuntu 10.10+.

Also one of the drawbacks of Ubuntu one is that it doesn’t mention if the data stored are encrypted or not. but as seen on forums most probably not encrypted which is a big issue for a lot of users. While Dropbox encypt data with AES-256 encyption.

So as i have 3 machines, with different distributions and versions (Ubuntu 8.04, Ubuntu 10.10, Ubuntu 9.04 and CentOS 5 + Windows Vista) and for Security (Encryption) I had to go with Dropbox. Sorry Ubuntu.

On Dropbox, Folders and files in your dropbox folder on your home directory are syncronized with all your machines linked to your cloud. Also you can browse the data on your cloud using Dropbox website

Japanese ball knows how to make an entrance

I liked this video about japanese RC flying ball that is like helicopter, have a camera, keep its balance amazingly and fully controlled. Can reach speed 40 MPH amazingly but its battery last for 8 minutes only. Liked it.

Gnome 3 – A New Desktop Experience

Gnome 3 has been released early this month under name Gnome Shell and two distributions have it now to try it by Linux users (Fedora and Suse distributions), I have tried the Fedora Live CD, if you didn’t try it yet, try it and you well see the next generation of Linux Desktops.

Gnome 3 require video card supporting hardware accelerators, so don’t try it with VMware player or Virtual box (I tried but didn’t work) ,in VMware or VirtualBox it will not run Gnome-shell and will run in a fallback mode as any older Gnome versions.

Wireless, sound, webcam work fine from Live CD, I liked many things with the new Gnome, first the maximize/minimize of windows, arrange multiple windows in workspace, switching between workspaces, adding your meetings/tasks in calendar located in panel and a lot more to explore.

From this few minutes experience with Gnome 3, i think Gnome Desktop may hit tablets business with this new desktop (After trying it, think if this desktop could be used with touch screen? I would say yes), as you may notice by trying it.

Here some screenshots instead of words:

Applications in Gnome 3

Windows in Gnome 3

Calender

Workspaces

Wireless Works !!

Synchrophasatron – Dubna – Great Russia.

I have visited Dubna JINR (Joint Institute for Nuclear Resaerch last May) for three week Summer School. While my visit i was facinated with a great machine that was built more than 50 years ago. This great machine is the Synchrophasotron.

LHC reaches 7 TeV Beam Collision

LHC (Large Hadron Collider) the most powerful accelerator and particle smasher exists on earth, On 30 March histroy was made, LHC has made two proton beams collide at energy of 3.5 TeV each, (7 TeV Collision)

Greatest Equations

Physics World magazine asked its readers for the greatest equation ever, and Euler equation is the one that won the greatest equation. I also have to say it’s is the most beautiful one among other equations, In the image below you will see why it is the greatest equation.

Greatest Equations

The equations that were fighting for the greatest equation are:

Other winners

And As Electrical Engineer, I’m happy for Maxwell’s equations taking the second position, and i had been happier if it took the first position but after i read beauty of Euler Equation i have to say that Euler equation has big meanings even its simple as 1 + 1 =2.

Welcome

Welcome to my blog, here i will write on some of my favorite subjects and sciences that i’m interested in like linux and embedded linux (my job is an embedded software engineer), Electromagnetic my studying field. and other topics that may not related to any thing above. we will see.

That’s all for now. But more will be posted ISA.