Practical_Antenna_Handbook_0071639586
I n d e x 765 vertically polarized antennas (Cont.): feedpoint impedance and matching, 244–247, 403–414, 408, 410, 412, 413–414 series feed, 244 shunt feed, 244–246 fence-Âpost supports, 647, 649–650 gamma-Âfed, 244–246, 504 grounded monopole, 232–234, 236–237 equivalence to vertical dipole, 233 grounding and ground system, 237–244, 401–403 losses in, 237 radials, 237, 239–244, 401, 403, 406, 412, 413 RF height vs. surface height, 248 ground-Âplane vertical monopole, 157, 233–237, 248, 415, 426–427, 433–434 5 ⁄8-wavelength, 236–237, 246–247 effect of base height on loss and efficiency, 248 feedpoint impedance and matching, 233, 234, 236 quarter-Âwavelength, 233–235 short monopoles, 236 half-Âslope vertical dipole, 191–193 image antenna in, 166–167 insulated-Âbase, 413–415 J-Âpole, 430 polarization defined, 229 quarter-Âwavelength grounded monopole, 233–235, 402 feedpoint impedance and matching, 233 radials (see radials) radiation pattern, Âthree-Âdimensional, 232 radiation resistance, 236–239 series-Âfeed, 408 short verticals: for 1.8 MHz, 404–415 continuous loading, 405–406 discrete Â(lumped-Âcomponent) loading, 404–405 efficiency, 406 ground systems (radials), 406, 412, 417–418 linear loading, 405–406 modeling, 409–410, 412 top loading, 404–405, 416 tower loading, 406–412 vertically polarized antennas (Cont.): shunt-Âfeed, 408–412 delta match, 408–409 gamma match, 408–412 omega match, 410 windowsill antennas, 369–371 vertical plane ground reflection factors, 167, 169–171 vertical polarization, 18–19, 36–37, 229 Beverage antenna, 334–335 vs. horizontal polarization, 248–249 very high frequency (VHF) antennas (See VHF/UHF antennas) very low frequency (VLF), 342, 344 VHF/UHF antennas, 425–445 5 ⁄8-wavelength 2-m vertical, 429–430 2-meter Yagi, 434–436 aiming, 425 balun, 441–442, 445 coaxial vertical, 427–429 collinear vertical, 430, 432 construction tradeoffs vs. HF, 425 delta match, 426, 442–443 dipole, 439–440 feedpoint impedance and matching, 440–445 frequency spectrum, 425 gain, 425 gamma match, 445 ground-Âplane vertical, 426–427, 433–434 halo, 436 J-Âpole, 430–431 quad, 436–438 Quagi, 438 safety, 426 scanner skyhook, 439–440 scanner antennas, 438–440 stub matching system, 140–142, 444–445, 579–582 television antennas, 438–439 voltage (V), 82–83 voltage gain, 711 voltage source, 86 Yagi, 434–436 virtual height, 54, 55 voltage, 82–84, 86, 88 dipole, 102–104, 106 (See also voltage standing wave ratio)
766 I n d e x voltage standing wave ratio, 132, 134–135, 136–138, 572, 576, 588–590 W W1FV, 275 W8JI, 274 W8JK array, 277 WA2WVL, 358 WARC bands, 312, 314, 325 water vapor vs. radio wave propagation, 9, 17, 27, 42–44 water wave analogy to radio wave propagation, 10–13 Watson-ÂWatt Adcock array, 522–523 wattmeters, RF, 603–613 wave antenna (See Beverage or “wave” antenna) waveguides, 109, 447–470 (See also microwave antennas; microwave waveguides) wavelength, 11–13 in transmission lines, 116, 118–119 units, 11–13 in waveguide, 454–458 in wires, 104–106 in Yagi beams, 284–285 WBZ radio station, 11–12, 159 weather-Ârelated propagation phenomena, 28, 34, 39–41, 42–44, 57 Web resources, 743–744 Welch, Daniel F., W6DFW, 525 Wheatstone bridge, 590–592 wide-Âaperture direction finder (WADF), 525 WiFi, 3 wind: force (load) due to, 656–660 pressure, 657 flat-Âplate impact pressure, 657 speed, 657, 659 zones, 663 winding toroids, 542–543 Windom, Loren, 226 Windom antenna, 226–228 windowsill antennas, 369–370, 372 wire antenna construction, 628–638 balun, 629, 631–633, 636 center insulator, 629–634 center support, 633 common-Âmode choke, 633–634 wire antenna construction (Cont.): connection to feedline, 629–634 counterweight, 641 door spring, 633, 638, 641 drip loop, 633 end insulators, 634–635 halyard, 638–639, 641–644 heat-Âshrink tubing, 633 hoisting techniques, 638–640 baseball, 639 bow and arrow, 640 fish line and reel, 639 potato launcher, 640 slingshot, 640 twine, 639 knots, 635 messenger cable, 644–645 pulley systems, 642–644 rope (cordage), 634, 635, 637–639 safety, 625–628, 640, 641 soft-Âdrawn copper, 630 solder and soldering, 629–632 strain relief, 629, 633, 644–645 twin-Âlead folded dipole insulators, 636–638 weatherproofing, 632–634 wire gauge and type, 630, 641 wireless, 3 nodes, 6 wireless communications services, 701 wireless telegraphy, 3 Wolf number, 49 Wonder Bar antenna, 197 wood preservation, 288, 291–292 World Administrative Radio Conferences (WARC), 4 Wullenweber array, 525–526 WWV radio station propagation forecasts, 50, 58 WWVH radio station propagation forecasts, 50 X x-Âray radiation, 48 Y Yagi antennas, 277–314 advantages, 278–279 aluminum oxide suspension, 290
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I n d e x 765<br />
vertically polarized antennas (Cont.):<br />
feedpoint impedance and matching,<br />
244–247, 403–414, 408, 410, 412,<br />
413–414<br />
series feed, 244<br />
shunt feed, 244–246<br />
fence-Âpost supports, 647, 649–650<br />
gamma-Âfed, 244–246, 504<br />
grounded monopole, 232–234, 236–237<br />
equivalence to vertical dipole, 233<br />
grounding and ground system, 237–244,<br />
401–403<br />
losses in, 237<br />
radials, 237, 239–244, 401, 403, 406,<br />
412, 413<br />
RF height vs. surface height, 248<br />
ground-Âplane vertical monopole, 157,<br />
233–237, 248, 415, 426–427, 433–434<br />
5<br />
⁄8-wavelength, 236–237, 246–247<br />
effect of base height on loss and<br />
efficiency, 248<br />
feedpoint impedance and<br />
matching, 233, 234, 236<br />
quarter-Âwavelength, 233–235<br />
short monopoles, 236<br />
half-Âslope vertical dipole, 191–193<br />
image antenna in, 166–167<br />
insulated-Âbase, 413–415<br />
J-Âpole, 430<br />
polarization defined, 229<br />
quarter-Âwavelength grounded<br />
monopole, 233–235, 402<br />
feedpoint impedance and<br />
matching, 233<br />
radials (see radials)<br />
radiation pattern, Âthree-Âdimensional, 232<br />
radiation resistance, 236–239<br />
series-Âfeed, 408<br />
short verticals:<br />
for 1.8 MHz, 404–415<br />
continuous loading, 405–406<br />
discrete Â(lumped-Âcomponent)<br />
loading, 404–405<br />
efficiency, 406<br />
ground systems (radials), 406, 412,<br />
417–418<br />
linear loading, 405–406<br />
modeling, 409–410, 412<br />
top loading, 404–405, 416<br />
tower loading, 406–412<br />
vertically polarized antennas (Cont.):<br />
shunt-Âfeed, 408–412<br />
delta match, 408–409<br />
gamma match, 408–412<br />
omega match, 410<br />
windowsill antennas, 369–371<br />
vertical plane ground reflection factors, 167,<br />
169–171<br />
vertical polarization, 18–19, 36–37, 229<br />
Beverage antenna, 334–335<br />
vs. horizontal polarization,<br />
248–249<br />
very high frequency (VHF) antennas (See<br />
VHF/UHF antennas)<br />
very low frequency (VLF), 342, 344<br />
VHF/UHF antennas, 425–445<br />
5<br />
⁄8-wavelength 2-m vertical, 429–430<br />
2-meter Yagi, 434–436<br />
aiming, 425<br />
balun, 441–442, 445<br />
coaxial vertical, 427–429<br />
collinear vertical, 430, 432<br />
construction tradeoffs vs. HF, 425<br />
delta match, 426, 442–443<br />
dipole, 439–440<br />
feedpoint impedance and matching,<br />
440–445<br />
frequency spectrum, 425<br />
gain, 425<br />
gamma match, 445<br />
ground-Âplane vertical, 426–427,<br />
433–434<br />
halo, 436<br />
J-Âpole, 430–431<br />
quad, 436–438<br />
Quagi, 438<br />
safety, 426<br />
scanner skyhook, 439–440<br />
scanner antennas, 438–440<br />
stub matching system, 140–142, 444–445,<br />
579–582<br />
television antennas, 438–439<br />
voltage (V), 82–83<br />
voltage gain, 711<br />
voltage source, 86<br />
Yagi, 434–436<br />
virtual height, 54, 55<br />
voltage, 82–84, 86, 88<br />
dipole, 102–104, 106<br />
(See also voltage standing wave ratio)
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