Practical_Antenna_Handbook_0071639586
Index Note: Boldface numbers denote definitions and/or primary coverage of a topic. 1.8 MHz (160-meter) antennas, 401–423 3-dB bandwidth, 711 3-dB beamwidth, 711 3-dB points, 711 4-square array, 273–274 4nec2, 546 5 ⁄8-wavelength Âground-Âplane vertical, 157, 429–430 λ/2 Âhalf-Âdelta sloper (HDS), 214–215 λ/2 loop, 207–209 1λ loops, 209–216 2λ (bisquare) loop, 215–216 11-year cycle, ionospheric propagation, 56 22-year cycle, ionospheric propagation, 56 27-day cycle, ionospheric propagation, 56 360-degree directional array, 272–273 A absorbed power (P ABS ), 578 absorption by atmosphere, 44, 64, 73 accelerated charge, 13, 87, 92–93, 717 acceleration, 716 Adcock, Frank, Lt., 520 Adcock antenna, 520–523 adjacent-Âchannel interference, 156, 360 adjustable plunger termination, 463, 466 admittance (Y), 142, 564, 575, 579 æther (also ether), 13, 90–91 air-Âarticulated line, 112–113 airborne radio, 40 airport proximity to tower, 700 Alexanderson alternators, 4 aluminum oxide suspension, 290 aluminum tubing, 293 aluminum vs. copper radiators, 193–194, 299, 317 amateur radio operators, 4–6 AM band portable radio, 515 AM broadcast band, 45, 52, 58, 334, 339, 342, 358, 360, 401, 511, 515, 516, 520, 654 AM/FM broadcast station antenna(s), 5, 266, 401, 421, 654, 694 radial fields, 240–241, 401, 403, 694 American Radio Relay League (ARRL), 45, 58, 66, 77, 226, 275, 314, 332–333, 396, 704 ammeter (thermocouple RF), 603 amplifier, 355, 356, 587 amplitude modulation (AM), 4 analyzer, 186, 187 (See also SWR analyzer; vector network analyzer) angle of incidence, 22–23, 47, 59–63 angle of reflection, 22–23 angular frequency (ω), 115 angular velocity, 716 antenna, 14, 81 antenna modeling software (See modeling software) antenna noise temperature, 491–495 745
746 I n d e x antenna tuning unit (ATU), 221–222, 533–544 for 1.8 MHz, 403–404, 413–414, 421 balun, 540–544 benefits, 533–534 circuit configurations, 534–540 for Âhigh-Âfrequency dipoles, 177, 187, 416 lumped-Âcomponent, 535–540 reactance cancellation, 534–535 remotely tuned, 534 shielding, 539–540 split-Âcapacitor network, 538–539 (See also tuning) antipode, 65 aperture, 17, 471, 478 (See also effective aperture) apex angle (longwire), 261–262 arcing, 315, 365 Armstrong oscillator circuit, 354–355 array factor, 153–159 arrays, 149–171 all-Âdriven, 149–161 broadside array, 151–152 broadside gain, 156–157 cardioid, 157–158 collinear, 156, 376, 430, 432 end-Âfire array, 152–153, 154–155, 215 fundamentals, 149–159 ground effects, 163–171 parasitic, 161–162, 277–314, 419, 434–436 phase shift, 485–487 quadrature phasing, 158–159 receiving, 161 side lobes, 156 Watson-ÂWatt Adcock array, 522–523 astronomy (See radio astronomy antennas) atmospheric layers and radio propagation, 20–22, 38–44 atmospheric noise (QRN), 331, 389 atmospheric pressure, 9, 34 attenuation constant (α), 120 attenuation of radio waves, 15–17, 28, 36, 42–44, 61 attenuation in transmission lines, 119–121, 135–138, 447–449, 582–583, 585 attic-Âinstalled antennas, 364–366 auroral propagation, 75–76 azimuthal equidistant projection (See great circle paths) B back lobes, 477 backscatter, 71 balanced transmission line, 110–111, 114 balun, 139–140, 196, 215, 302, 441–442, 445, 540–544, 629, 631–633, 636 current transformer wattmeter, 608–613 ferrite core, 540–544 multifilar windings, 540–541 multi-Âimpedance (tapped), 540–541 strain relief, 543 trifilar windings, 540 turns, 543–544 windings, 540–544 winding techniques, 542–544 bandwidth, 177–178, 200, 292, 316–319, 381–382, 711 beam antennas (rotatable): cubical quad, 315–324 Moxon, 306–308 W8JK, 277 Yagi, 277–314 ZL-Âspecial, 264 beam vs. beamwidth, 278 beamwidth, 279, 476–477 bent dipole, 157, 200, 202, 306–308, 316, 416, 549–554 (See also dipole) Beverage, H. H., 333 Beverage or “wave” antenna, 67, 182, 332–341 bidirectional, 339–340 cone of silence, 334 efficiency, 182, 332–333 feedpoint impedance and matching, 334, 338 grounding, 333–338 installation of, 333–338 insulators, 337 maximum effective length (MEL), 334–335 on the ground (BOG), 341 phased, 340 termination resistors, 336–337 testing, 338–339 bidirectional RDF patterns, 512–514
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Index<br />
Note: Boldface numbers denote definitions and/or primary coverage of a topic.<br />
1.8 MHz (160-meter) antennas, 401–423<br />
3-dB bandwidth, 711<br />
3-dB beamwidth, 711<br />
3-dB points, 711<br />
4-square array, 273–274<br />
4nec2, 546<br />
5<br />
⁄8-wavelength Âground-Âplane vertical, 157,<br />
429–430<br />
λ/2 Âhalf-Âdelta sloper (HDS), 214–215<br />
λ/2 loop, 207–209<br />
1λ loops, 209–216<br />
2λ (bisquare) loop, 215–216<br />
11-year cycle, ionospheric propagation, 56<br />
22-year cycle, ionospheric propagation, 56<br />
27-day cycle, ionospheric propagation, 56<br />
360-degree directional array, 272–273<br />
A<br />
absorbed power (P ABS ), 578<br />
absorption by atmosphere, 44, 64, 73<br />
accelerated charge, 13, 87, 92–93, 717<br />
acceleration, 716<br />
Adcock, Frank, Lt., 520<br />
Adcock antenna, 520–523<br />
adjacent-Âchannel interference, 156,<br />
360<br />
adjustable plunger termination, 463,<br />
466<br />
admittance (Y), 142, 564, 575, 579<br />
æther (also ether), 13, 90–91<br />
air-Âarticulated line, 112–113<br />
airborne radio, 40<br />
airport proximity to tower, 700<br />
Alexanderson alternators, 4<br />
aluminum oxide suspension, 290<br />
aluminum tubing, 293<br />
aluminum vs. copper radiators, 193–194, 299,<br />
317<br />
amateur radio operators, 4–6<br />
AM band portable radio, 515<br />
AM broadcast band, 45, 52, 58, 334, 339, 342,<br />
358, 360, 401, 511, 515, 516, 520, 654<br />
AM/FM broadcast station antenna(s), 5, 266,<br />
401, 421, 654, 694<br />
radial fields, 240–241, 401, 403, 694<br />
American Radio Relay League (ARRL), 45, 58,<br />
66, 77, 226, 275, 314, 332–333, 396, 704<br />
ammeter (thermocouple RF), 603<br />
amplifier, 355, 356, 587<br />
amplitude modulation (AM), 4<br />
analyzer, 186, 187<br />
(See also SWR analyzer; vector network<br />
analyzer)<br />
angle of incidence, 22–23, 47, 59–63<br />
angle of reflection, 22–23<br />
angular frequency (ω), 115<br />
angular velocity, 716<br />
antenna, 14, 81<br />
antenna modeling software (See modeling<br />
software)<br />
antenna noise temperature, 491–495<br />
745
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