[amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ

[Stan W1LE]

Hello Luc,

Like any other fleamarket/hamfest/ebay item, you do not know what you have
till you get it home and and evaluated on the test bench. Bid 
accordingly.....

The feed is probably a simple dipole. Take the plastic housing apart and
tune the dipole (shorten/lengthen) to where you want it.

Or, get another feed for the freqs needed.
The manufacturer may offer different freq response feeds for their same 
dish.

My first gridded dish I tuned up for 2304 MHz and it performed well 
afterwards.
The gridded dish on the satellite tower came with a decent VSWR at 2400 MHz.

The fades in reception of 2.4 GHz satellites are due to using a linear 
polarization
and NOT a circular polarization. Try a circularly polarized feed.
Or try a H AND a V linearly polarized antenna system,
select in the shack which one to listen to.

Stan,W1LE   Cape Cod    FN41sr



Luc Leblanc wrote:
> For those who are using WiFi 802,G beam on S band 
>
> I just found that my Pacific Wireless WIMAX VA 25 -16 antenna for 2.4GHZ has a bandwidth starting at 2.5ghz to 2.7ghz (www.pacwireless.com) 
> Even if at theses frequencies things are a bit larger i'm guessing the 16db gain figures are surely not standing at 2.4ghz. Did any one 
> have a ball game figures of what remains at 2.4ghz? I have no way to measure SWR at this frequency and this is surely not optimal?
>
> Conclusion don't jump too fast on some hamfest deal as what's good for WiFI is not always so good at 2.4ghz!
>
> P.S. I can use the antenna on 2.4ghz and i got fairly good signal from AO-51 when he's in S mode but i cannot get rid out of the fades. 
> Could be i found why?
>
>
> "-"
>
>
> Luc Leblanc VE2DWE
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