Random Wire Antenna - Revision history

VE3NGS at 16:10, 8 January 2011

2011-01-08T16:10:34Z

← Older revision		Revision as of 09:10, 8 January 2011
Line 3:		Line 3:
	A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.		A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.

	Jack Clarke VE3EED adds that for optimum performance, "random length" antennas should not be multiples of half wavelengths in the intended bands. The following table reproduced with permission from his [http://www.jackclarke.net/hamdnld.htm website] details half wave lengths that should be avoided.		Jack Clarke VE3EED adds that for optimum performance, "random length" antennas should not be multiples of half wavelengths in the intended bands. The following table reproduced with permission from his [http://www.jackclarke.net/hamdnld.htm website] details half wave lengths that should be avoided (all measurements are in feet):

	<table border="1" cellpadding="6" cellspacing="0" width="58%">		<table border="1" cellpadding="6" cellspacing="0" width="58%">

KJ6EUO: /* Advantages and Uses */

2010-08-12T23:09:46Z

Advantages and Uses

← Older revision		Revision as of 16:09, 12 August 2010
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	== Advantages and Uses ==		== Advantages and Uses ==
			A random wire Antenna is used in conjunction with an antenna tuner to achieve resonance over a range of bands. The advantage being that it can be used without the need to make physical reconfigurations to the antenna system in order to change bands.

	== Basic Construction ==		== Basic Construction ==

KJ6EUO at 23:33, 4 August 2010

2010-08-04T23:33:09Z

← Older revision		Revision as of 16:33, 4 August 2010
Line 97:		Line 97:

	29 35.5 41 58 71 84 107 119 148 203 347 407 423		29 35.5 41 58 71 84 107 119 148 203 347 407 423

			== Advantages and Uses ==

			== Basic Construction ==
			The basic design of a random length wire Antenna consists of a driven wire of a length that does not correspond to the wavelength of the intended Band and a grounded plane of conductive material such as steel. It differs physically from a Vertical in that ???.

	{{antennas}}		{{antennas}}

TimVK4YEH: added table and list from Jack VE3EED

2009-04-14T05:54:50Z

added table and list from Jack VE3EED

← Older revision		Revision as of 22:54, 13 April 2009
Line 3:		Line 3:
	A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.		A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.

			Jack Clarke VE3EED adds that for optimum performance, "random length" antennas should not be multiples of half wavelengths in the intended bands. The following table reproduced with permission from his [http://www.jackclarke.net/hamdnld.htm website] details half wave lengths that should be avoided.

			<table border="1" cellpadding="6" cellspacing="0" width="58%">
			<tr>

			<td width="20%" align="center"><font face="Arial" size="3" color="#FF0000"><b>Frequency
			MHz</b></font></td>
			<td width="20%" align="center"><font face="Arial" size="3" color="#FF0000"><b>1/2
			Wave</b></font></td>
			<td width="20%" align="center"><font face="Arial" size="3" color="#FF0000"><b>2nd
			Multiple</b></font></td>
			<td width="20%" align="center"><font face="Arial" size="3" color="#FF0000"><b>3rd
			Multiple</b></font></td>
			<td width="20%" align="center"><font face="Arial" size="3" color="#FF0000"><b>4th
			Multiple</b></font></td>
			</tr>

			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>1.9</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>246</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>492</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>738</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>984</b></font></td>

			</tr>
			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>3.8</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>123</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>246</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>369</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>492</b></font></td>

			</tr>
			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>7.2</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>65</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>130</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>195</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>260</b></font></td>

			</tr>
			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>10.1</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>46</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>92</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>138</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>184</b></font></td>

			</tr>
			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>14.2</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>33</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>66</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>99</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>132</b></font></td>

			</tr>
			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>18.1</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>26</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>52</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>78</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>104</b></font></td>

			</tr>
			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>21.3</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>22</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>44</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>66</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>88</b></font></td>

			</tr>
			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>24.9</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>19</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>38</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>57</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>76</b></font></td>

			</tr>
			<tr>
			<td width="20%" align="right"><font face="Arial" size="3"><b>28.5</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>16</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>32</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>48</b></font></td>
			<td width="20%" align="right"><font face="Arial" size="3"><b>64</b></font></td>

			</tr>
			</table>

			Further calculations by Jack led him to produce the following list of "preferred" list of antenna lengths, to avoid half wavelengths and their multiples (measurements in feet):

			29 35.5 41 58 71 84 107 119 148 203 347 407 423

	{{antennas}}		{{antennas}}

Carlb at 00:56, 9 April 2009

2009-04-09T00:56:07Z

← Older revision		Revision as of 17:56, 8 April 2009
Line 2:		Line 2:

	A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.		A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.


			{{antennas}}

VK1WJ at 12:57, 7 April 2009

2009-04-07T12:57:03Z

← Older revision		Revision as of 05:57, 7 April 2009
Line 1:		Line 1:
	A "Random Wire" antenna is an end-fed antenna that is operated against ground or an artificial ground system - much like a vertical antenna. The "Random Wire" must normally be coupled to the transmitter by an [~~http://www.amateur-radio-wiki.net/index.php?title=~~Impedance_matching ATU] (except if it happens to be in resonance on some amateur band).		A "Random Wire" antenna is an end-fed antenna that is operated against ground or an artificial ground system - much like a vertical antenna. The "Random Wire" must normally be coupled to the transmitter by an [[Impedance_matching\|ATU]] (except if it happens to be in resonance on some amateur band).

	A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.		A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.

VK1WJ at 10:00, 6 April 2009

2009-04-06T10:00:44Z

← Older revision		Revision as of 03:00, 6 April 2009
Line 1:		Line 1:
	A "Random Wire" antenna is an end-fed antenna that is operated against ground or an artificial ground system - much like a vertical antenna. The "Random Wire" must normally be coupled to the transmitter by an ATU (except if it happens to be in resonance on some amateur band).		A "Random Wire" antenna is an end-fed antenna that is operated against ground or an artificial ground system - much like a vertical antenna. The "Random Wire" must normally be coupled to the transmitter by an [http://www.amateur-radio-wiki.net/index.php?title=Impedance_matching ATU] (except if it happens to be in resonance on some amateur band).

	A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.		A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.

VK1WJ: New page: A "Random Wire" antenna is an end-fed antenna that is operated against ground or an artificial ground system - much like a vertical antenna. The "Random Wire" must normally be coupled to t...

2009-04-03T11:40:16Z

New page: A "Random Wire" antenna is an end-fed antenna that is operated against ground or an artificial ground system - much like a vertical antenna. The "Random Wire" must normally be coupled to t...

New page

A "Random Wire" antenna is an end-fed antenna that is operated against ground or an artificial ground system - much like a vertical antenna. The "Random Wire" must normally be coupled to the transmitter by an ATU (except if it happens to be in resonance on some amateur band).

A popular length is 7m. This does not provide excessive impedances for the ATU to tune out for bands between 80 and 10m.