[Moon-net] Orthogonal polarization???

[YU7XL]

Hi all
More than 6 dB is absolutelly impossible. There is
another reason that you get more than 6 dB result. Most of antennas have a
little bit higher gain up of the central frequency. When stacking, the
central frequency shifts downwards, and the area of higher gain is comming
to your wanted frequency. Actually, the gain does not exceed 6 dB.
73, Boban, YU7XL


----- Original Message ----- 
From: "graham" <graham.d at orange.fr>
To: "Edward Cole" <kl7uw at acsalaska.net>; "Leif Asbrink" <leif at sm5bsz.com>; 
<moon-net at list-serv.davidv.net>
Sent: Saturday, January 12, 2008 9:49 AM
Subject: Re: [Moon-net] Orthogonal polarization???


>
>>.  I do not know how
>>one exceeds 6-dB stacking gain
>
> There are a number of antennas that display this characteristic during
> array modelling.....whether they actually realise the result in the real
> world would be difficult/impossible to verify on an amateur range.
>
> It happens 'typically' in some older designs that were not computer
> optimised, the old Tonna 16/17 can be easily made to display this if 
> anyone
> wants to play with it..... I forget the stacking parameters that give
> this > 6dB result.
>
> It occurs because coupling of the antennas together in an array has
> influence on  each part of the array.
>
> But one has to be careful because poor segmentation can also distort
> results, either way,  as can 'short cut' modellers ( such as YO)  and the
> most popular g/t  modeller ( yagi 3.54) which has a 3dB 'assumed' gain in
> one plane also....
>
> Graham F5VHX
>
>
>
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