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<title>Re: [NSRCA-discussion] 2,4 Module</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In free space. Wire and dielectric will
alter this somewhat. <grin></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
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<p><b><i><font size=4 color=navy face="Brush Script MT"><span style='font-size:
13.5pt;font-family:"Brush Script MT";color:navy;font-weight:bold;font-style:
italic'>Jay </span></font></i></b><b><i><font size=4 color=navy
face="Brush Script MT"><span style='font-size:13.5pt;font-family:"Brush Script MT";
color:navy;font-weight:bold;font-style:italic'>Marshall</span></font></i></b><font
color=navy><span style='color:navy'> </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> </span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>nsrca-discussion-bounces@lists.nsrca.org</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> [mailto:</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>nsrca-discussion-bounces@lists.nsrca.org</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Mark Atwood<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, May 08, 2008 11:20
AM<br>
<b><span style='font-weight:bold'>To:</span></b> </span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>General pattern
discussion</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
2,4 Module</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=2 face=Calibri><span style='font-size:11.0pt;font-family:Calibri'>The
antenna’s we used on the 72mhz band were 1/4 wave antenna’s.
Approx 1 m. The 72Mhz wavelength is 416cm for a full wave (varying
some for which specific frequency you were on.<br>
<br>
The 2.4Ghz wavelength is only 12.4cm or about 4.8in. So an equivalent
quarter wave antenna will only be about 1.2in in length.<br>
<br>
-M<br>
<br>
PS for those that care, wavelength (in cm) = speed of light (in cm) / Frequency
(in cycles per second)<br>
<br>
<br>
On 5/8/08 10:54 AM, "rcmaster199@aol.com" <rcmaster199@aol.com>
wrote:</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Calibri><span
style='font-size:11.0pt;font-family:Calibri'>***</span></font><b><font size=4
face=Arial><span style='font-size:14.0pt;font-family:Arial;font-weight:bold'>When
you realize all this from that measley little 4" antenna, it's almost
jaw-dropping. ***<br>
</span></font></b><font size=2 face=Calibri><span style='font-size:11.0pt;
font-family:Calibri'><br>
<br>
Basically, the length of the antenna is related to frequency of the
transmission. 2.4 gig freq is made up of small wavelength. If you remember High
School Physics, the relation between Freq and Wavelength... ie- it's an inverse
relationship. As Freq goes up, WL becomes small. At 72 meg, WL is fairly long,
hence the reason for the longer antenna; at 27 meg, wl is even longer. Those
who used 27 meg equipment a bunch of moons ago, will remember that Tx and RX
antennas were pretty long and only represented 1/2 the WL (I think it was 1/2)<br>
<br>
Dean Pappas, Ed Alt and Jim Oddino can explain further if needed<br>
<br>
BTW, tuning a pipe on a 2 stroke requires similar understanding between rpm
(base frequency) and tuning length (wavelength of the exhaust pressure front
and type of exhaust) to achieve the desired resonance....similar to electrical
antennas. QED<br>
<br>
MattK<br>
<br>
</span></font></p>
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