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

Jeff Griffin kb2m at comcast.net
Thu Sep 7 14:40:39 PDT 2006

  Ok guy's, how about a test ?  Why not everyone who is mode L/S capable get 
on AO-51 between September 11, and September 18th and  post all results 
here? Or have another mode V/S session for the L band challenged? All we 
need is degree(s) of elevation worked, type of antenna, and rx environment, 
and quality of rx signal received. This should tell us what we want to know. 
I don't think there is a problem, as I worked up to 10 stations a pass last 
mode V/S session , and didn't hear anyone complain....

73 Jeff kb2m

----- Original Message ----- 
From: "Andrew Glasbrenner" <glasbrenner at mindspring.com>
To: "Rick Fletcher" <rfletcher at plumdragon.com>; "'AMSAT'" 
<amsat-bb at amsat.org>
Sent: Thursday, September 07, 2006 2:38 PM
Subject: [amsat-bb] Re: S band downlink on P3E

> Rick,
> 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 
>>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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