[amsat-bb] Re: S band downlink on P3E
Eric H. Christensen
kf4otn at ericsatcom.net
Fri Sep 8 04:41:14 PDT 2006
Who is designing the ground equipment? It sounds like someone has a
get-rich-quick scheme up their sleeve...
kf4otn at amsat.org
Quoting AL7CR <al7cr at punakea.com>:
> I too totally agree. I see no reason why we can not vote on the
> designers decision with our support dollars. Personally, I am giving
> all mine to P3E.
> The fact that they are "designing the ground equipment too" is of no
> comfort to me. My S band gear is on the tower and operating.
> If AMSAT thinks this is such a great decision then let them find the
> money to support it without the majority of us.
> Dean Shutt
> sco at sco-inc.com wrote:
>> I totally agree with you.
>> Les W4SCO
>> 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.
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