[NSRCA-discussion] 2,4 Module

Thu May 8 12:01:43 AKDT 2008

Re: [NSRCA-discussion] 2,4 ModuleYupper... "Bat - a - via" , NY -- sorta near Niagara Falls and Buffalo.
 I think the ratio of hams in pattern is much higher ratio than general AMA membership.

 73
    Del 
  ----- Original Message ----- 
  From: Mark Atwood 
  To: General pattern discussion 
  Sent: Thursday, May 08, 2008 3:09 PM
  Subject: Re: [NSRCA-discussion] 2,4 Module

  2???  Del, where do you live??   For some reason I didn't picture you in the NY/NJ area.   That or my regions are messed up.

  KB8TSU

  On 5/8/08 3:03 PM, "Del Rykert" <drykert2 at rochester.rr.com> wrote:

    I thought that was kb2joi  clear  <tic> 

        Del

      ----- Original Message ----- 

      From:  Jay  Marshall <mailto:lightfoot at sc.rr.com>  

      To: 'General pattern  discussion' <mailto:nsrca-discussion at lists.nsrca.org>  

      Sent: Thursday, May 08, 2008 11:35  AM

      Subject: Re: [NSRCA-discussion] 2,4  Module

      Roger that! Over and  out ...

      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 11:31 AM
      To:  General pattern  discussion
      Subject: Re: [NSRCA-discussion] 2,4  Module

      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] <mailto:nsrca-discussion-bounces at lists.nsrca.org%5d>   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 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.

      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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