[Moon-net] Dish for 10 meters possible?

[Raymond Cote]

Well, thanks for the formula.  I was thinking of posting such a question 
as to a formula.

Doesn't  the frequency come in to the formula for gain, or am I missing 
something.

Also, since I was talking to a moon-net member about sky noise, sun 
noise and moon noise, does the eclipse tonight change the s/n of the 
received transmission?  How does the sun not shining on the moon durn 
data T/R change with less light.  

Ray



Rastislav Galuscak wrote:

>Gentlemen,
>
>   The Gain of dish antenna is given by formula
>
>      pi2 x D2
>G = ----------------  * efficiency     (ratio)     
>      lambda2
>
>where pi2 is pi power of two, D2 is dish diameter power of two,  lambda2 is lambda power of two. So consider 55% of efficiency for 10 m wavelength, and Gain 45 dBi (express as ratio 31622.7766), we get the dish diameter D = 763.25 m. More about this problem is available in my and Mr. Hazdra article in 1/2007 DUBUS magazine.
>
>   73, Rasto,OM6AA
>
>
>
>
>
>
>scott archer <scott231us at yahoo.com> wrote: Anyone know how large the measurements for a
>dish/feedhorn would need to be, to operate on 10
>meters?  Say to get about 45dbi of gain..  For point
>to point stuff, and experimenting with aiming signals
>towards the tropo/ionospheres..
>
>
>
>Just curious,
>
>
>kb9wis
>
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