[TowerTalk] Raibeams & "Supergain"

[wa4dou@juno.com]

Hi Darrel,
  Is not the ZL Special in the league you describe? The claim nowadays
for it is 3 dbd.
I'm not attacking the Raibeam, only suggesting that its claim to fame,
"Supergain" is not a patented process to Raibeam, but instead, is a
"subtractive" process in the operation of most amateur beams. The ad
suggests that Raibeam has the inside track on Supergain. I hardly call
1-1 1/2 dbd, if indeed that claim can stand the light of day, a
remarkable difference. 
 73 Roy WA4DOU
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> The rule-of-thumb relationship between gain and Yagi boomlength only 
> applies to antennas with one driven element elements and a 
> collection of parasitic elements.  An antenna with active drive of 
> multiple elements controlling power and phase CAN exceed this 
> performance.  The Raibeam 2 element antennas are obviously driving 
> both elements with a delay-line controlled phase shift.
> 
> However, since I have no direct experience with the Raibeam, I won't 
> claim they have suceeded or not (after all, you can also approach 0 
> dBi with the right amplitude and phase).
> 
> --
> Darrel J. Van Buer, AK6I
> vanbuerd@mediaone.net
> 
> 
> 
> 
> --
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