Popular Posts

Thursday, November 26, 2009

Numb3rs Description About IRC ( Internet Relay Chat )




WTF ?

Internet Relay Chat (IRC) is a form of real-time Internet text messaging (chat) or synchronous conferencing.[1] It is mainly designed for group communication in discussion forums, called channels,[2] but also allows one-to-one communication via private message[3] as well as chat and data transfers via Direct Client-to-Client.[4]
As of May 2009, the top 100 IRC networks served more than half a million users at a time, with hundreds of thousands of channels (the vast majority of which stand mostly vacant), operating on a total of roughly 1,500 servers worldwide.[5]
IRC was created by Jarkko Oikarinen in August 1988 to replace a program called MUT (MultiUser Talk) on a BBS called OuluBox in Finland. Oikarinen found inspiration in a chat system known as Bitnet Relay, which operated on the BITNET.[6]
IRC was used to report on the 1991 Soviet coup d'├ętat attempt throughout a media blackout.[7] It was previously used in a similar fashion during the Gulf War.[8] Logs of these and other events are kept in the ibiblio archive.[9]
IRC client software is available for virtually every computer operating system that supports TCP/IP networking.

Friday, November 20, 2009

What You Need To Do When You Bought A Nokia Phone




Check This

1. *#92702689# = Make sure the lifetimer is 000000:00 value.
2. *#06# - Make sure the phone's IMEI number is same with the box
3. *#0000# - Make sure it's firmware is up to date
4. Check the screen for dead pixel by changing the screen to 1 colour.
5. Check for any physical or tempted damage on the phone body

Wednesday, November 18, 2009

Aurora - What Makes Them Happen ?





Before we can understand auroras, we need a few facts about the space around our Earth. There are many things in this space that we can't see.
One thing is the air we breathe, our atmosphere. It is really a mixture of several gases, mostly nitrogen and oxygen, with traces of hydrogen, helium and various compounds.

A Field of Earth
Another thing we can't see is a magnetic field that surrounds the Earth. If you've ever played with a bar magnet and iron filings you've seen the curved patterns the filings form in the magnetic field. The next picture shows how the magnetic field around the earth's core is like the field of a bar magnet.

The Earth's "magnet" is deep in the core. Since we can't see the magnetic field, we draw lines to represent it. The field lines go into and out of the Earth around the Earth's magnetic poles.
 


Where the lines are closest together the field is strongest. Where they are furthest apart it is weakest. Can you tell where the magnetic field is the strongest? Where is it weakest?
 
Charged Particles
A third invisible thing in the space around the Earth is a plasma, made of lots of charged particles. There are always electrons and positive ions in the surrounding magnetic field. Charged particles in a magnetic field move in a special way: they are guided by the field. The particles travel along magnetic field lines as if they were wires, circling around the lines in a long spiral as they go. Charged particles are the "ammunition" of an aurora.

Solar Powered Display
The short answer to how the aurora happens is that energetic electrically charged particles (mostly electrons) accelerate along the magnetic field lines into the upper atmosphere, where they collide with gas atoms, causing the atoms to give off light. But why does that happen? To find the answer, we must look further away, to the Sun. The spectacular, "great" auroras in "What do they look like?" are powered by what is called the solar wind.
The Sun also has an atmosphere and a magnetic field that extend into space. The Sun's atmosphere is made of hydrogen, which is itself made of subatomic particles: protons and electrons. These particles are constantly boiling off the Sun and streaming outward at very high speeds.  Together, the Sun's magnetic field and particles are called the "solar wind."




This wind is always pushing on the Earth's magnetic field, changing its shape.  You change the shape of a soap bubble in a similar way when you blow on its surface. We call this compressed field around the earth the magnetosphere. The Earth's field is compressed on the day side, where the solar wind flows over it. It is also stretched into a long tail like the wake of a ship, which is called the magnetotail, and points away from the Sun.
Squeezing the Earth's magnetic field takes energy, just the way it takes energy to compress a balloon with air in it. The whole process is still not fully understood, but energy from the solar wind is constantly building up in the magnetosphere, and this energy is what powers auroras.
The Big Push
So we have the Earth's magnetosphere, with the solar wind squeezing the magnetosphere and charged particles everywhere in the field. Solar particles are always entering the tail of the magnetosphere from the solar wind and moving toward the Sun. Now and then, when conditions are right, the build-up of pressure from the solar wind creates an electric voltage between the magnetotail and the poles, like the voltage between the two terminals of a battery. It can reach about 10,000 volts!
The voltage pushes electrons (which are very light) toward the magnetic poles, accelerating them to high speeds, much like the electrons in a TV picture tube that accelerate to hit the screen. They zoom along the field lines towards the ground to the north and south, until huge numbers of electrons are pushed down into the upper layer of the atmosphere, called the ionosphere.



 In the ionosphere, the speeding electrons collide violently with gas atoms. This gives the gas atoms energy, which causes them to release both light and more electrons. In this way, the gases of the ionosphere glow and conduct flowing electric currents into and out of the polar region. The electrons flowing back out don't have as much energy as the speedy incoming ones had - that energy went into creating the aurora!

The way the aurora works is a lot like a neon sign, except that in the aurora, the conducting gas is in the ionosphere, instead of a glass tube, and the current travels along magnetic field lines instead of copper wires.


Aurora can affect propagation conditions over the polar routes and is often used to enhance VHF propagation, especially at 50 MHz and sometimes the 144 MHz Amateur bands. At times of auroral displays, HF radio signals traveling over the polar route will develop a distinctive warbling sound. You can often hear these effects on 14 MHz SSB signals that have followed the great circle route over the polar region. During intense auroral activity, HF propagation down to the 3.5 MHz band can be affected. And if you are lucky enough to be in the right place, you can watch the spectacular visible auroral displays in the night-time sky.

p/s: sadly, there is no aurora phenomena here in Malaysia





 

Saturday, November 14, 2009

Extending ICOM IC-E91 HT Frequency Range






Description: Type: Amateur VHF/UHF transceiver
Frequency range: TX: 144-146 / 430-440 MHz

RX: 0.495-999.990 MHz
5/6.25/8.33/9/10/12.5/15/20/25/30/50/100/200 KHz steps
Mode: TX: FM (DV option (Digital voice) UT-121)
RX: AM/FM/WFM (DV option (Digital voice) UT-121)
RF Power output: Hi: 5/5
Lo: 0.5/0.5 W
Sensitivity: N/A
Selectivity: N/A
Image rejection: N/A
Voltage: ? VDC battery or 10-16 VDC external
Current drain: RX: 17-370 mA
TX: Max 2.2 A
Impedance: 50 ohms, SMA
Dimensions (W*H*D): 58*103*34 mm
Weight: 300 gr (with battery and antenna)
Manufactured: Japan, 2006-200x
Other: 1304 memories. DTMF and CTCSS. Spectrum scope
PC-programmable. Alpha tags. Twin RX. D-Star option 




------------------------------------------------------------------------------------------------

Gentleman,
as u can see here, the default tx frequency range for icom ic-91 is only between 144-146 and 430-440 MHz
for those who want to extend their tx frequency range Allows TX from 137.000 – 174.000 and 400.000 – 470.000, just follow these simple steps.

----------------------------------------------------------------------------------
Begin
---------------------------------------------------------------------------------

1. Remove battery, and four screws inside the battery compartment.
2. Remove the two screws at the top (outside) back of the radio.
3. Pull front and back of radio apart gently. There will be a white flat ribbon cable connecting the two.










4. (Optional) Pull the brown part of the ribbon cable connector upwards using your fingernail or small screwdriver. This will release the ribbon cable, and give your fingers some room to move the soldering iron.

5. Locate the diode D13. It is in the upper right hand corner. This diode needs to be removed for expanded TX operation. With a small tipped soldering iron, gently pull up on the diode as you melt the solder. You should be able to lift one side of the diode, then when you move the soldering iron to the other side, it should lift off (or fly across the table, never to be seen again).  
6.  Put the radio back together in the reverse order it was taken apart.
7. DONE! now u can test your handy talkie.



This modification does allow the DV mode to be used on any TX band.


Tuesday, November 10, 2009

iDitDah - Morse Code Keyboard/Trainer For iPhone and iPod Touch








iDitDahText is a keyboard alternative for the iPhone and iPod touch invented by KB1OOO that allows you to enter characters by tapping their Morse code.   The interface is a dual lever touch paddle (which also can be used as single lever paddle), coupled to an iambic keyer and decoder.  Please watch the video above for details along with a demonstration of text being entered at 50 WPM. iDitDahText also provides a plugin for a game called Typing Sebastian: a simple, fun way to learn how to use Morse code with iDitDahText.


Monday, November 2, 2009

Yagi Calculator by John Drew VK5DJ

Yagi Calculator is a Windows program (also runs well on Linux - Ubuntu 8.10 under Wine) to produce dimensions for a DL6WU style long Yagi antenna. Long yagis are commonly used from the 144MHz amateur band to the 2.4GHz band. The DL6WU yagi is highly regarded as being easy to build with repeatable results, broad bandwidth and a useful pattern.









Related Posts Plugin for WordPress, Blogger...