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content/wire/g5rv2.html

@@ -182,7 +182,7 @@ meters     MHz        R+/-jX           SWR        R+/-jX          SWR
   <p>In place of such baluns to suppress common-mode currents, Varney recommends a 6" diameter coil of about 8 to 10 turns of the feedline coaxial cable at the junction of the matching section and the main feedline. I have found that W2DU-type ferrite bead chokes also perform well in this function.</p>
   <p>One recommendation that I have seen from vendors of commercially prepared G5RV kits is to use as long a run of coaxial cable as possible. Coaxial cable is inherently lossier than parallel transmission line. Any SWR factor acts as a multiplier on the basic matched-line loss of a cable at a given frequency. Hence, the only reason that I can think of for using a very long run of coaxial cable--other than one of necessity for extending from the shack to the antenna--is to use the line losses to mask the SWR at the shack end of the line. If the measured SWR at the shack end of the line is very significantly lower than the sorts of figures produced by these models--or models customized to the system proposed by a user--then they result from line losses. And the only purpose for accepting such losses would be to operate the system without a tuner.</p>
   <p>With a wide-range tuner, one achieves the lowest feasible loss level with the shortest possible coaxial cable run.</p>
-  <p>For a good analysis of the losses associated with various ways of employing combinations of parallel line, coaxial cables, and tuners with the basic G5RV wire, see the extensive notes of Owen Duffy, VK1OD, at <a href="https://owenduffy.net/antenna/G5RV/" target="_blank">owenduffy.net/antenna/G5RV/</a>.</p>
+  <p>For a good analysis of the losses associated with various ways of employing combinations of parallel line, coaxial cables, and tuners with the basic G5RV wire, see the extensive notes of Owen Duffy, VK1OD, at <a href="https://web.archive.org/web/20240318044108/https://owenduffy.net/antenna/G5RV/" target="_blank">owenduffy.net/antenna/G5RV/</a>(web.archive.org).</p>
   <h4>Conclusion to Part 2</h4>From Louis Varney's own writings, we can derive and confirm with NEC-4 models the fact that the G5RV antenna system is suitable for multi-band operation, just as any wire from about 88 to 140 feet might be. The matching system comes into play, not to do away with the need for an ATU, but to permit the use of a coaxial cable as the main feedline with SWR values that are considerably lower than they would be without the matching section on most HF bands. Nevertheless, the ATU remains an essential part of the G5RV antenna system.
   <p>The use of coaxial cable for the main feedline has some advantages in the modern home. Contemporary homes have walls, ceilings, and floors that are rampant with wiring and other metallic conductors associated with heating and air conditioning systems. Hence, indoors, the chances of a parallel line encountering environments that would disrupt the line balance have multiplied with time. A coaxial cable main feedline properly immunized from common-mode currents with a suitable choke offers some isolation from the conductive contents of the modern home with only small losses as the cost.</p>
   <p>50-Ohm cable has come to rule the field of amateur feedlines. As well, the ATU remains among many folks a suspect device, since it adds to the number of boxes on the operating desk. As a result, after the appearance of the G5RV antenna system, a search ensued for a combination of antenna wire length and matching section that would yield the highest number of amateur bands offering ATU-less operation on a 50-Ohm cable. We shall devote a final part to this series to explore a G5RV variant, perhaps the most successful effort to reach the 50-Ohm cable goal.</p>

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