[eagle] Re: AO-51 Multiband Antenna???
greencl at mindspring.com
Mon Sep 3 20:22:56 PDT 2007
Let me take my best shot at what I'm reading here... there is
confusion. I think the confusion comes from mixing the term
"multi-band" with "variable frequency receive, aka SQRX". They have
nothing to do with each other.
The multi-band antenna is an L/S antenna. That's it. It's a beautiful
piece of work by Stan.
The SQRX is fed from a splitter that is fed from the VHF antenna. The
majority of the antenna signal goes to a preamp and then is split four
ways to feed the four VHF receivers. The smaller portion of the antenna
signal goes to the SQRX. I believe this antenna was designed by Mark
Kanawati, but I'm not sure.
If you want to see a couple of thousand pictures, including many of the
internals of the satellite, you can look at my collection at
I hope this helps,
Gould Smith wrote:
> As Drew said Stan designed it, with maybe help from Lou.
> I was told that it is an L Band antenna with S band stubs. There is a
> ground plane under it with radials for L and S band.
> I wasn't able to get specifics about gain when I did the book.
> ----- Original Message -----
> From: "Andrew Glasbrenner" <glasbrenner at mindspring.com>
> To: "Bill Ress" <bill at hsmicrowave.com>; <eagle at amsat.org>
> Sent: Monday, September 03, 2007 8:06 PM
> Subject: [eagle] Re: AO-51 Multiband Antenna???
>> Stan Wood designed it. It is a dual band L and S antenna, linearly
>> polarized. I'm not sure what sort of "in orbit data" you are looking for,
>> but it is in use whenever the L band uplink or S band downlink is in use
>> including later this month.
>> http://n4hy.smugmug.com/gallery/2107663#108915239 has good pics of the
>> Something in particular you'd like to try?
>> 73, Drew KO4MA
>> ----- Original Message -----
>> From: "Bill Ress" <bill at hsmicrowave.com>
>> To: <eagle at amsat.org>
>> Sent: Monday, September 03, 2007 7:54 PM
>> Subject: [eagle] AO-51 Multiband Antenna???
>>> Perhaps one of you can detail the "multiband antenna" used with the SQRX
>>> receiver aboard AO-51.
>>> A perusal of Gould Smith's "ECHO" makes reference to it but provides no
>>> Does anyone have any in orbit data for this mode. What's the current
>>> status for its use?
>>> Regards and thanks...Bill - N6GHz
>>> Via the Eagle mailing list courtesy of AMSAT-NA
>>> Eagle at amsat.org
>> Via the Eagle mailing list courtesy of AMSAT-NA
>> Eagle at amsat.org
> Via the Eagle mailing list courtesy of AMSAT-NA
> Eagle at amsat.org
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