[amsat-bb] Polarity

Joe nss at mwt.net
Sat Jan 9 14:58:33 UTC 2016

sorry missed adding the pdf address that I referred to below, here it is,


The Original Rolling Ball Clock
Idle Tyme
On 1/9/2016 8:51 AM, Joe wrote:
> Cross Polarization.
> We all know that vertical to vertical = Zero db loss from cross 
> polarization.
> same with horizontal to horizontal
> and
> Right hand circular to RHC as well s LHC TO LHC
> And then in theory, the "Infinite loss"  when vert to horiz, and RHC 
> to LHC
> But while in theory it says "Infinite" in practicality it's more like 
> 30 to 40 db or so.
> Now I did notice this effect when I had an antenna array that the db 
> loss was NOT linear.
> Like say at 45 degrees of polarity error, being half way in a linear 
> world would be 15 to 20 db loss, but according to this pdf file it is 
> only 3 db down.
> And I do agree with this because I do remember when rotating the 
> polarity little change was noticed till the last bit and the max deep 
> part was very small.
> Now does anyone know of a chart anywhere where the values for every 
> degree of something really is? Like 45 deg is 3 db down,  50 deg =? 55 
> deg =?  etc.
> anyone?
> Joe WB9SBD

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