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The Yaesu FRG-100 is a Japanese made general coverage receiver manufactured between 1994 and 2000 and providing coverage from 500 kHz to 30 Mhz in AM, SSB and CW modes.
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The Yaesu FRG-7 was a classic Japanese made general coverage receiver manufactured between 1976 and 1980 and providing coverage from 500 kHz to 29.9 Mhz in AM, SSB and CW modes. The receiver performed very well for its price at the time, although the 6 kHz selectivity was rather wide.
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The Yaesu FRG-7000 was a Japanese made general coverage receiver manufactured between 1977 and 1980 and providing coverage from 250 kHz to 29.999 Mhz in AM, SSB and CW modes. The
Yaesu FRG-7000 was the digital replacement for the earlier Yaesu FRG-7, with a 3 kHz selectivity added, but lacked performance.
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The Yaesu FRG-7700 was a Japanese made general coverage receiver manufactured between 1981 and 1984 and providing coverage from 150 kHz to 29.999 Mhz in AM, SSB, CW and FM modes.
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The Yaesu FRG-8800 was a Japanese made general coverage receiver manufactured between 1985 and 1993 and providing coverage from 150 kHz to 30 Mhz in AM, SSB, CW and FM modes. Performance was fairly mediocre compared to similarly priced receivers produced around the same time, such as the Kenwood R-2000 and the Icom I-R72.
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The Yaesu FT-990 was a Japanese amateur radio high-frequency transceiver of the late 1980's. The Yaesu FT-990 covered 100 kHz to 30 Mhz in receive mode with transmitting coverage of the amateur radio bands between 1.8 Mhz and 29.7 Mhz, in AM, FM, SSB, CW and FSK modes. The Yaesu FT-990 contained a triple-conversion superhet receiver.
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A dipole aerial working in conjunction with a system of passive directors and a passive reflector is called a Yagi aerial or Yagi array or sometimes an 'end-fire parasitic aerial'. It is named after the Japanese engineer who wrote in English about the work originally published in Japanese between 1926 and 1928 by a colleague, Professor Uda. The Yagi and modified Yagi array are the most popular of all aerials used for the reception of television signals. Indeed, they form the basis of almost all domestic vhf and uhf aerials. Although one could add directors almost indefinitely to a
Yagi aerial, in practice the more directors that are added, the progressively smaller becomes their effect on gain and directivity. After about nine or so directors, not much benefit is derived by adding more. A better idea then to secure enhanced gain and directivity is to couple two, four or more complete Yagi aerials together. This technique produces so-called stacked or broadside arrays, the individual arrays being placed one above the other or side by side respectively.
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Yolk is a food store found in eggs.
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Ytterbium is a bivalent or trivalent metallic element of the rare-earth elements that resembles yttrium and occurs with it and related elements in several minerals such as gadolinite. It has the symbol Yb.
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Ytterium is a trivalent metallic element usually included among the rare earth elements which it resembles chemically and with which it occurs in minerals. It has the symbol Y.
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Yttrium is a metal element with the symbol Y. It is one of the transition elements in group 3 (or IIIb) of the periodic table. Yttrium melts at about 15220 Celsius, boils at about 33380 Celsius. It is sometimes included among the rare earth elements. It was isolated by the German chemist Friedrich Wohler. Yttrium metal, which has a silvery lustre, can be prepared by the reduction of
yttrium trifluoride (YF3) with calcium. It oxidizes readily in air to the oxide and dissolves in hot water to form the hydroxide. Yttrium ranks about 29th in abundance of the elements in the earth' s crust. Yttrium is found as an oxide in most of the rare earth minerals. It is used extensively in phosphors employed in colour television tubes.
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