G5RV Antenna formulas


	G5RV Antenna formulas

djkraven

10-7-2008 9:36 AM

201 views

tags:

ham radio, amatuer radio

djkraven says:

This site provides a good explanation of the formulas for the dipole and matching section length.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/224be35d-4c84-4595-ba72-0472acd9fd92/987E3766-29A1-4CA5-856D-91A60EE6BC1C/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.qsl.net/yb0emj/g5rv.html" href="http://www.qsl.net/yb0emj/g5rv.html" style="font-size: 11px;">www.qsl.net</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.qsl.net/yb0emj/g5rv.html"><CENTER>
<BIG>The G5RV<BR />Multiband HF Antenna</BIG>
</CENTER></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.qsl.net/yb0emj/g5rv.html"><TABLE border="0" width="400"><TBODY><TR><TD class="left"><B>LENGTH ( in feet )</B></TD><TD class="left">= ( 492 ( n - 0.05 )) / f (MHz)</TD></TR><TR><TD></TD><TD class="left">               = ( 492 ( 3 - 0.05 )) / 14.15</TD></TR><TR><TD></TD><TD class="left">               = 102.57 ft ( 31.26 m )</TD></TR><TR></TR><TR><TD></TD><TD class="left">(n = number of half wavelengths of the wire) </TD></TR></TBODY></TABLE></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.qsl.net/yb0emj/g5rv.html"><P>
<B>MATCHING SECTION LENGTH :</B>
The length of the matching section is an ELECTRICAL half-wave on 14 MHz.
The actual physical length is determined by the following formula :
</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.qsl.net/yb0emj/g5rv.html"><B>LENGTH ( in feet )</B></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.qsl.net/yb0emj/g5rv.html">= ( 492 x VF ) / f (MHz)</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.qsl.net/yb0emj/g5rv.html"><li style="margin-left:16px;padding-left: 0px;">Ladder line (Window line) = 0.90 
</LI></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.qsl.net/yb0emj/g5rv.html"><P>
<B>THE ANTENNA LENGTH :</B>

The design center frequency of the full-size version (configured as a 3/2-wave dipole on 20m) is 14.150 MHz, 
and the dimension of 102 ft is derived from the formula for long-wire antennas which is :</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/987E3766-29A1-4CA5-856D-91A60EE6BC1C/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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