Electronics (Mike Jaroch)
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พิเศษ | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ก | ข | ค | ฆ | ง | จ | ฉ | ช | ซ | ฌ | ญ | ฎ | ฏ | ฐ | ฑ | ฒ | ณ | ด | ต | ถ | ท | ธ | น | บ | ป | ผ | ฝ | พ | ฟ | ภ | ม | ย | ร | ล | ว | ศ | ษ | ส | ห | ฬ | อ | ฮ | ทั้งหมด
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HEATERSame as a FILAMENT [6]. | |
HEIGHT-FINDING RADARA radar that provides target altitude, range, and bearing data [18]. | |
HELIX(1) A spirally wound transmission line used in a traveling-wave tube to delay the forward progress of the input traveling wave [11]. (2) A large coil of wire. It acts as a coil and is used with variable inductors for impedance matching of high-power transmitters [17]. | |
HELIX HOUSEA building at a transmitter site that contains antenna loading, coupling, and tuning circuits [17]. | |
HENRYThe electromagnetic unit of inductance or mutual inductance. The inductance of a circuit is 1 henry when a current variation of 1 ampere per second induces 1 volt. In electronics, smaller units are used, such as the millihenry (mH), which is one-thousandth of a henry (H), and the microhenry (μH) which is one-millionth of a henry [2]. | |
HERTZA unit of frequency equal to one cycle per second [2]. | |
HERTZ ANTENNAA half-wave antenna that is installed some distance above ground and positioned either vertically or horizontally [10]. | |
HETERODYNE DETECTIONThe use of an a.f. voltage to distinguish between available signals. The incoming cw signal is mixed with locally generated oscillations to give an a.f. output [12]. | |
HETERODYNING(1) The process of mixing two frequencies across a nonlinear impedance [12]. (2) The process of mixing the incoming signal with the local oscillator frequency. This produces the two fundamentals and the sum and difference frequencies [17]. | |
HEXADECIMALSame as SEXADECIMAL. A number system with a base of sixteen; also pertains to conditions, choices, or selections that have sixteen possible values or states [13]. | |