[NSRCA-discussion] 2,4 Module

[Mark Atwood]

Yeah...but do we REALLY want to go there????  Lmao...  Then it will start to
sound like the HAM forum...




On 5/8/08 11:27 AM, "Jay Marshall" <lightfoot at sc.rr.com> wrote:

> In free space.  Wire and dielectric will alter this somewhat. <grin>
>  
> 
> Jay Marshall 
> 
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Mark Atwood
> Sent: Thursday, May 08, 2008 11:20 AM
> To: General pattern discussion
> Subject: Re: [NSRCA-discussion] 2,4 Module
>  
> The antenna¹s we used on the 72mhz band were 1/4 wave antenna¹s.  Approx 1 m.
> The 72Mhz wavelength is 416cm for a full wave (varying some for which specific
> frequency you were on.
> 
> 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.
> 
> -M
> 
> PS for those that care, wavelength (in cm) = speed of light (in cm) /
> Frequency (in cycles per second)
> 
> 
> On 5/8/08 10:54 AM, "rcmaster199 at aol.com" <rcmaster199 at aol.com> wrote:
> ***When you realize all this from that measley little 4" antenna, it's almost
> jaw-dropping.  ***
> 
>  
> 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)
>  
> Dean Pappas, Ed Alt and Jim Oddino can explain further if needed
>  
> 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
>  
> MattK
>  
>  
>>>  
>>> 
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