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<DIV><FONT face=Arial size=2>Thank goodness the 72Mhz setups can use 1/4 wave
antennas. Sure would look funny to see a flight line of four meter
long antennas! ;-)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keith Black</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=atwoodm@paragon-inc.com href="mailto:atwoodm@paragon-inc.com">Mark
Atwood</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">General pattern discussion</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, May 08, 2008 10:19
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] 2,4
Module</DIV>
<DIV><BR></DIV><FONT size=4><FONT
face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt">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:<BR><BR></SPAN></FONT></FONT>
<BLOCKQUOTE><FONT size=4><FONT
face="Calibri, Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 11pt">***</SPAN></FONT></FONT><FONT size=5><FONT
face=Arial><SPAN style="FONT-SIZE: 14pt"><B>When you realize all this from
that measley little 4" antenna, it's almost jaw-dropping.
***<BR></B></SPAN></FONT></FONT><FONT size=4><FONT
face="Calibri, Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 11pt"><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> <BR></SPAN></FONT></FONT>
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