[amsat-bb] Re: S band downlink on P3E

sco@sco-inc.com sco at sco-inc.com
Thu Sep 7 12:30:15 PDT 2006

I totally agree with you.


At 02:38 PM 9/7/2006, you wrote:
>I am in _TOTAL_ agreement. I live in the suburbs of Tampa/St. Pete and never
>had an interference problem on my 3 foot dish. I have used the same dish to
>log well over a dozen WiFi access points in that immediate neighborhood.
>With properly designed equipment, all that trash on 2.4 ghz goes away with
>some elevation. What won't work is helixes with multiple sidelobes, and
>surplus dishes that let one whole polarity of noise right thru the back.
>Everyone knows I'm a big supporter of AMSAT, but I gotta call it as I see
>it. It makes me think of "bait and switch" to collect money for a project
>featuring such a popular mode and then drop it.
>The loss of Mode B on AO-40 caused a lot of the hardcore AO-10/AO-13 types
>to walk away, and that was tough to overcome. Now that we have, and we have
>people wanting S band, we leave them behind too. Even if it's a sound
>engineering decision (and that hasn't been proven to me) it's a horrid
>marketing decision. Bad mojo for a organization that lives on the donations
>of it's members.
>Sorry if this causes any pain to those involved with Eagle, but I needed to
>get it off my chest.
>73, Drew KO4MA
>AMSAT LM 2332
> >While AO-40 was still alive and I was working it from deep within "Silicon
> >Valley", an area blanketed by WiFi, 2.4GHz cordless phones, etc., I
> >discovered that a parabolic dish with a properly positioned and designed
> >patch feed (slightly under-illuminating the dish and having no significant
> >side-lobes) would bring in AO-40's S-band downlink very nicely and cleanly.
> >Of course, other feed or antenna types such as helical antennas/feeds were
> >useless in that environment.
> >I have to admit that I don't buy the "too noisy" argument.
> >73,
> >Rick
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