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A Timeline in the History of Radio

We bring you back to the history of radio communication. Radio communication plays vital role in world war during the time. It changed human history multiple times. Now we take a look on the marking point. 

A Timeline in the History of Radio
1799	Volta Italian physicist known for the invention of the battery
1838	Morse demonstrates telegraphy
1861	Transcontinental telegraph by wire
1876	Bell invents telephone
1883	Edison invents the Edison effect Note: Edison effect is a emission of electrons from a hot cathode into a vacuum
1886	Hertz produces and detects electric waves
1897	J.J.Thompson discovers the electron
1899	Wireless telegraphy
1904	Radio alternator designed
1912	RF generator invented
1914	American Radio Relay League founded
1918	Superheterodyne receiver invented
1924	Directive shortwave antenna invented
1925	Human features transmitted by television
1925	Pioneers work on radar
1928	One-way police radio communication
1931	Radioastronomy founded by detection of radio waves from the center of our Milky Way galaxy.
1933	Two-way police radio communication
1933	FM invented
1937	Radiotelescope used to find the first discrete radio sources beyond Earth and map the natural radio signals across the Milky Way
1942	Voice of America shortwave broadcasts in English, French, Italian, German
1944	BBC broadcasts coded messages to Fench resistance before D-Day
1945	Astronomers develop radioastronomy
1945	Japan's Emperor announces his country's surrender in his first radio broadcast
1946	First and brightest radio source beyond our galaxy, Cygnus A, discovered
1946	Transistor invented will make small radios commercially feasible
1950-1969	Electronic technology applied to spaceflight
1951	Electromagnetic radiation discovered coming from interstellar hydrogen at a radio wavelength of 21 cm
1953	First amateur radio moonbounced
1957	Beeping radio signal from Sputnik 1, Earth's first artificial satellite
1959	Radio signal from first human-made object to leave Earth, USSR probe Luna 1
1959	Radio signal from first human-made object to reach another world, USSR probe Lunik 2 on the Moon
1959	Radio-photos from first spacecraft to go behind the Moon, USSR probe Lunik 3
1959	The integrated circuit (IC) is introduced
1959	First communication satellite, Echo, launched by US
1960	First radio-photos of Earth weather from orbit
1961	First human communication from space
1961	First amateur radio satellite
1962	Transatlantic reception of television signal via satellite
1962	Radio signal from first human-made object to reach another planet, Mariner 2 at Venus
1963	First female human communication from space
1963	Arecibo radiotelescope
1965	Radio signal from human-made object at Mars, Mariner 4
1969	Human communication from the Moon
1969	Internet
1971	Human communication from a space station
1973	Radio signal from human-made object at Jupiter, Pioneer 10
1981	Human communication from a space shuttle
1981	Sony introduces consumer synthesized radio receiver
1983	Radio signal from spacecraft leaving the Solar System, Pioneer 10
1983	Direct broadcast TV
1986	Cellular phones become international business
1986	Radio signal from human-made object at Uranus, Voyager 2
1989	Radio signal from human-made object at Neptune, Voyager 2
1991	World Wide Web
1992	XM Satellite Radio
1994	Internet radio broadcasting Internet television broadcasting
1995	Digital signal processing receiver introduced
1999	Sirius Satellite Radio
2001	Software Radio chips available
2003	Digital Radio Mondiale (DRM) – digital AM radio with FM-quality sound
2004	Podcasting begins

VHF vs UHF Head to Head

Dua Frekuensi ini sangat popular di gunakan di dalam dunia radio amatur serta radio dua hala (walkie-talkie).

Kebanyakan orang menganggap teknologi UHF mempunyai  kelebihan jika dibandingkan dengan VHF. Tetapi sangkaan ini adalah tidak tepat kerana perbezaan yang ketara di antara VHF dan UHV adalah dari segi  band frekuensi nya sahaja. Teknologi, prinsip dan teori asas pengoperasian bagi kedua-duanya sama sahaja.  Jadi, apakah perbezaan antara keduanya?

Bil	VHF	UHF
1	Bermaksud Very High Frequency	Bermaksud Ultra High Frequency
2	Frekuensi bermula dari 30MHz sehingga 300Mhz	Frekuensi bermula dari 300MHz sehingga 1000 Mhz
3	Digunakan di dalam penyiaran radio dan TV,  Radio kecemasan, penggunaan komunikasi ketenteraan, komunikasi  trafik udara, radio amatur	Digunakan di dalam penyiaraan TV (Digital), komunikasi satelit, telefon bimbit, telefon tanpa wayar
4	Bentuk frekuensi :	Bentuk frekuensi :
5	Disebabkan gelombang frekuensi adalah panjang, jarak penerimaan adalah jauh. Ia nya sangat popular di kalangan radio amatur.	Disebabkan gelombang frekuensi pendek, jarak  penerimaan adalah pendek. Ini menyebabkan ianya tidak sesuai dengan penyiaraan radio & televisyen kerana kos yang sangat tinggi untuk penyediaan peralatan.
6	Sungguh pun jarak penerimaan yang jauh, ianya tidak effisen di kawasan yang mempunyai kepadatan yang tinggi seperti kawasan bandar, kompleks membeli belah, kawasan hutan kerana gelombang frekuensi sukar untuk menembusi bahan-bahan pejal dan padat	Ianya sangat sesuai digunakan didalam kawasan kepadatan tinggi seperti di pusat membeli belah kerana gelombang frekuensi dapat menembusi bahan2 pejal seperti konkrit, besi, dinding tebal.
7	Pengunaan antena yang lebih panjang. Secara teori, lebih panjang pengunaan antena adalah lebih baik	Penggunaan antena yang pendek dan secara teori lebih pendek antena adalah lebih baik.
8	Berbanding UHF, peralatan VHF agak murah kerana kuasa untuk memancarkan transmisi VHF sedikit. In berbalik kepada teori asas gelombang frekuensi VHF yang rendah.	Peralatan UHF agak tinggi berbanding VHF kerana pemancaraan transmisi memerlukan kuasa yang tinggi.

P/S:  Peralatan walkie talkie adalah dinamik kerana ianya boleh memancarkan gelombang VHF  mahupun UHF mengikut keperluan, tetapi hanya satu frekuensi boleh di pancarkan pada satu masa. Sesetengah walkie talkie model mempunyai dual mode dimana ianya boleh memancarkan kedua2 frekuensi.

Bitcoin - Internet Currency

If Internet is a nation, how it can keep up and generate its own economy without the basic thing, which is $$$? This video explain a very fascinating invention on internet currency that have been existing for few years. Some country have implemented and accept BitCoin as valid money for business transactions. 

Some people may skeptical about safety and security which i leave it on the debate, but the marvel engineering behind the design blow our mind a away. I wonder how smart these people are that can create such a state of the art invention. 

p/s: Walkie Talkie is not a currency, it hold no value for bargaining. But value on communication is priceless....

The Invention of Loneliness

Sejauh manakah kita merasa media sosial memainkan peranan dalam kehidupan kita seharian? Adakah media sosial jawapan kepada permasalahan yang berlaku di kalangan mereka yang pendiam, pasif dan yang kurang berkawan? Adakah media sosial merapatkan jurang komunikasi antara satu individu dengan individu yang lain?

Realiti sebenarnya bukan lah seperti apa yang anda gambarkan. 

P/S: Walkie Talkie juga boleh merapatkan jurang komunikasi antara satu sama lain.. ^_^