Monday, February 15, 2010

Making CDMA / GSM / 3G Antenna

Your Signal modem / mobile broadband is weak? try this way, with a Antenna GSM and CDMA 1900 Mhz might be one alternative solution to for those who want to make your own and require only simple equipment and low cost.

We know that the speed internet access of cellular (mobile broadband) both GSM and CDMA are determined by the received signal strength. If you have problems with signal strength below the required equipment to make the antenna GSM and CDMA 1900 MHz:

  • Cutting pliers
  • Bor
  • Cutter knife
  • Tang shark
  • Solder + lead

* RG58 cable (cable Tv antenna can) according to the length of each

* A tin cans, tin cans may be powdered milk. See details in the picture.

* Jack BNC male + female (can also jack type)

* TV antenna jack Male + female

* PCB blank size 4X8 cm (for the induction of the antenna on Mobile phone)

* 0,8 mm copper wire (you also can use from large copper)

After the above equipment has been prepared following all steps of manufacture:

1. Clean the paint on the outside of the can

Antena CDMA 1900 Mhz 2 How to Make Antenna GSM and CDMA 1900 Mhz

will be like this

Antena CDMA 1900 Mhz 3 How to Make Antenna GSM and CDMA 1900 Mhz

2. Cut the copper wire as long as 30,716 mm copper wire and solder it to the end of the BNC jack female

Antena CDMA 1900 Mhz 4 How to Make Antenna GSM and CDMA 1900 Mhz

3. Punch a hole the size of cans for female BNC jack. Hole distance of 38,401 mm behind the cans. and attach the female BNC Jack that have soldered with copper wire into the hole cans. So be like this

Antena CDMA 1900 Mhz 5 How to Make Antenna GSM and CDMA 1900 Mhz

Antena CDMA 1900 Mhz 6 How to Make Antenna GSM and CDMA 1900 Mhz

if you look next

Antena CDMA 1900 Mhz 7 How to Make Antenna GSM and CDMA 1900 Mhz

4. Create an antenna from the PCB Induction plain created by the flow path as shown below with a box cutter knife. Forming a groove / line up and down. Female jack solder to the PCB antenna television, the middle path to ground while the edge of the PCB to + antenna connected to the copper wire on the can antenna. Note the center and edge lines are not related.

Antena CDMA 1900 Mhz 8 How to Make Antenna GSM and CDMA 1900 Mhz

5. Connect the antenna cable end to male BNC jack

Antena CDMA 1900 Mhz 9 How to Make Antenna GSM and CDMA 1900 Mhz

Antena CDMA 1900 Mhz 10 How to Make Antenna GSM and CDMA 1900 Mhz

6. Connect the other end of the antenna cable to the TV antenna jack male

7. Replace Jack BNC male to BNC female while the male TV antenna to jack female TV antenna on PC antenna induction. Now, antenna ready to be installed outside using the pole. And point the antenna to the nearest BTS provider.

Antena CDMA 1900 Mhz 11 How to Make Antenna GSM and CDMA 1900 Mhz

8. Manufacture and installation of the antenna is complete. After that Put your mobile phone or modem is above induction PCB antenna and see the signal change obtained, if the signal obtained was a kid means the antenna is not correct, looking up at the antenna to get better.

Note: If in your area without the antenna has a signal but only a few bars on the antenna does not need to install an antenna outside Put enough on the computer and find a good antenna direction to get additional bar signal, and your mobile phone / modem is ready for use with a stable signal.

Antenna specifications:

Antena CDMA 1900 Mhz 12 300x175 How to Make Antenna GSM and CDMA 1900 Mhz

Antena CDMA 1900 Mhz 13 How to Make Antenna GSM and CDMA 1900 Mhz

  • Working on the line frequency: 1464.402Mhz (low frequency) ut to 1912.917Mhz (upper frequency)
  • D = 120 mm (diameter cans)
  • Lg / 4 = 38,401 mm (distance to the back of copper wire tin)
  • Lo / 4 = 30,716 mm (high copper wire)
  • 3/4Lg = 153,603 mm (length tin)

Wednesday, September 2, 2009

Deadly earthquake hits Indonesia

A powerful earthquake has struck off the Indonesian island of Java, killing at least 32 people, officials say.

Scores more were wounded and it is feared the death toll will rise as many homes have reportedly been buried under a landslide triggered by the quake.

More than 700 houses were badly damaged by the magnitude 7.0 quake, a social affairs ministry official told AP.

The quake struck around 1500 (0800 GMT). Its epicentre was offshore, 115km (70 miles) south-west of Tasikmalaya.

Medical teams have been dispatched to the city, where damaged properties included the mayor's home and a mosque.

The tremors were felt in the capital, Jakarta, 200km to the north, where hundreds fled into the streets from offices and shops.

A local tsunami alert was issued but revoked shortly afterwards.

Swaying and shaking

About 30 people are still trapped under rocks and dirt in one village after the landslide on Java's southern coast, Indonesia's official Antara news agency reported.

Building damaged in Java quake

Some people were killed when buildings collapsed in the district of Cianjur, in Tasikmalaya and in the town of Sukabumi.

In Jakarta, one eyewitness, who gave his name as Jonathan, told the BBC News website he was on the 28th floor of an office block when the quake struck.

"I went into the meeting room and took shelter under the table," he said. "It went on for about a minute I think - scary.

"It was like being in a boat on rough water, the building swaying from side to side. The doors were flapping, books fell off piles," he said.

At least 27 people were injured in the capital, officials said.

Java map

The quake was also felt 500km away from its epicentre in Surabaya, Indonesia's second-largest city, and on the resort island of Bali.

Seismologists recorded a slight rise in the sea level at Pelabuhan Ratu off the west of the island following the quake, indicating there had been a small tsunami.

In December 2004, an earthquake off the coast of Sumatra in Indonesia triggered a tsunami that killed more than 200,000 people around Asia.

Indonesia sits on the Pacific Ring of Fire, one of the most active areas for earthquakes and volcanic activity in the world.


Source : http://news.bbc.co.uk/2/hi/asia-pacific/8233344.stm

Thursday, August 13, 2009

Orchidaceae

Orchid" redirects here. For other uses, see Orchid (disambiguation).
Orchidaceae
Fossil range: 80 Ma
Late Cretaceous - Recent

Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
Order: Asparagales
Family: Orchidaceae
Juss.

Distribution range of family Orchidaceae
Subfamilies

Orchidaceae, the Orchid family, is the largest family of the flowering plants (Angiospermae).[1][2] Its name is derived from the genus Orchis.

The Royal Botanical Gardens of Kew list 880 genera and nearly 22,000 accepted species, but the exact number is unknown (perhaps as many as 25,000)[3] because of taxonomic disputes. The number of orchid species equals about four times the number of mammal species, or more than twice the number of bird species. It also encompasses about 6–11% of all seed plants.[4] About 800 new orchid species are added each year. The largest genera are Bulbophyllum (2,000 species), Epidendrum (1,500 species), Dendrobium (1,400 species) and Pleurothallis (1,000 species). The family also includes the Vanilla (the genus of the vanilla plant), Orchis (type genus) and many commonly cultivated plants like some Phalaenopsis or Cattleya.

Moreover, since the introduction of tropical species in the 19th century, horticulturists have produced more than 100,000 hybrids and cultivars.

The complex mechanisms which orchids evolve to achieve cross-pollination were investigated by Charles Darwin and described in his 1862 book On the various contrivances by which British and foreign orchids are fertilised by insects, and on the good effects of intercrossing.

Hans Christian Ørsted

ans Christian Ørsted (14 August 1777 – 9 March 1851) was a Danish physicist and chemist who is best known for discovering that electric currents can create magnetic fields, which is an important part of Electromagnetism. He shaped post-Kantian philosophy and advances in science throughout the late nineteenth century.[1] He was also the first modern thinker to explicitly describe and name the thought experiment.


Hans Christian Ørsted

Born 14 August 1777(1777-08-14)
Rudkøbing, Denmark
Died 9 March 1851 (aged 73)
Copenhagen, Denmark
Nationality Danish
Fields physics
chemistry
Known for electromagnetism

Saturday, August 8, 2009

Wellawahum (Sri Lankan Pancakes with coconut) recipe


Although called Pancakes in Sri Lanka, these are Crepes filled with a coconut mixture. Usually served with afternoon tea.

For the pancakes:
2 cups all-purpose flour
3 eggs
Pinch of turmeric (optional)
Pinch salt
1 cup milk, or as needed

Combine flour, eggs and salt in a food processor or blender. Add enough milk to make a fluid batter. Cover and refrigerated the batter for about 30 mins.
Now make the filling.

For the filling:
1 1/2 cups freshly grated coconut.
1/2 cup of Kitul Treacle (Or substitute 2/3 cup of brown sugar, dissolved in 1/4 cup water)
3 cloves crushed.
Pinch salt.
Pinch pepper.

Bring the treacle to boil under medium heat. Add the rest of the filling ingredients. Cook for about 5 minutes stirring constantly. Set aside.
Now make the pancakes.

Heat an 8-inch crepe pan or skillet over medium heat for about 1 minute. Coat the surface of the pan with piece of cloth soaked in vegetable oil. After it gets sizzling hot, ladle some batter onto the middle of the crepe pan and immediately start swirling the pan to distribute the batter over the surface. Cook for 45 to 60 seconds or until lightly golden brown. Flip over and cook the other side for 20 seconds. Remove to a plate.

Spread about 2 tbsp of the filling over a diameter of the pancake evenly and roll. Repeat with the remaining batter. Serve warm.