DL1BI - Logo und Link zur Startseite

Breaking News:

23. December 2015 20:36

P5/3Z9DX Ham radio activation of North Korea

The ARRL reports the first amateur radio operation from Pyongyang, N.Korea in 13 years took place on December 20. In an...

10. December 2015 13:12

Icom IC-7300 starts up in Japan....

Icom announced on, December 7th 2015, that delivery of the new IC-7300 will start from mid January 2016 for the Japanese market,...

26. August 2015 18:02

Baofeng buys Tokyo High Power Labs....

The takeover of the Tokyo High Power Labs should be taken place late of 2014th After officially...

HAM Radio History

The beginning of HAM Radio

In 1888 it was the German physicist Heinrich Hertz, he produced for the first time on base of the theories of James Clerk Maxwell electromagnetic vibrations and to receive some distances back. In January 1896 Alexander Stepanovich Popov published an article about a "device for detection and registration of electric oscillations" with which he on 24 March 1896 clearly demonstrated the wireless transmission of signals over a distance of 250 meters. Guglielmo Marconi built these device and he has patented it in June 1896. This begins the story of wireless telegraphy. Only with the invention of the vacuum tube amplifier 1923, the wireless radio technology developed with the rapidly evolving consumer electronics (radio and television).

The first commercial station then, used frequencies below 1.5 MHz (we would say today to medium wave); needed here was a single transmitter to bridge distances, though with an output power of the order of several hundred kilowatts. At higher frequencies themselves could be bridged with such high powers only distances up to several hundred kilometers, so were all higher frequencies (short wave)  were not used. On 27 November 1923 the first two-way radio communication over short waves between an American and a French amateur radio station esd produced at a wavelength of about 110 meters, or approximately 2.7 MHz.

It soon turned out that we got on to the short waves with a fraction of the energy that consumed the large commercial stations on the long waves. So far, only the propagation of ground wave has been studied, only later, scientists discovered that short waves are reflected from the ionosphere. Suddenly, the possibility was recognized throughout Europe and to build even global wireless links with transmission powers in the watt range.

Over the years, many commercial stations located on the short waves. Because of the compact, simpler antenna systems and the much lower power demand the necessary investments were much lower.

As each new shortwave station simply looking for a published rate it blank and went on the air, something had to be taken to avoid a frequency chaos. Enthusiasts from all over the world took so in 1927 for a conference and distributed the short waves (which are the waves of 100 meters to 10 meters) below the state and commercial radio stations, leaving the amateur radio service more frequency ranges in the vicinity of 160, 80 , 40, 20, 15 and 10 meters wavelength. The hams had organized an international conference before the decision and the International Amateur Radio Union (IARU) joined forces to defend their interests. The result of this conference was written in the Washington Agreement to radio communications. Today is the International Telecommunication Convention, which governs the successor to the Agreement of 1927, the radio uses and still called the amateur radio frequency bands, and amateur bands, contains.

The amateur radio service was thus officially recognized and affirmed as an equal radio service.

There were first European amateur radio activities in Great Britain due to the Wireless Telegraphy Act of 1904. The first license holders were professionals such as Guglielmo Marconi and John Ambrose Fleming. They had to accept severe restrictions on the transmission power, and range (up to ten miles) to the frequencies and operating hours.

Radio clubs were recognized in Germany in November 1924 experiment station licenses. Since the club licensing could be used by radio amateurs and a few were not granted individual licenses in general, it was subsequently to increased illegal operation ("Black radio", "pirates"). Another reason was the lack of licenses for telephony (AM), which were previously issued valid only for telegraphy. As of August 1933 by the German Reich postal transmission licenses issued for radio friends, bringing the number of amateur stations to 1939, rising to about 600. Condition for obtaining a license was among others, the membership of the German amateur transmitting and receiving service (DASD). From the end of war in 1939 war radio licenses were issued, the number of war to the end of 1945 reached about 100. On 23 March 1949 were issued on the basis of the Amateur Radio Act, the first 700 amateur transmitting and receiving permits, now there are about 82,000 in Germany. Source: Wikipedia