[Namaste-dev] Re: link budget

Frank Brickle brickle at pobox.com
Thu May 29 06:43:38 PDT 2008


IE? You mean people are still using that?

How quaint!

;-)

73
Frank
AB2KT



On Thu, May 29, 2008 at 9:37 AM, Michelle <w5nyv at yahoo.com> wrote:

> I don't think the OpenKM server is open for business quite yet.
> Dave just yesterday (successfully) worked through two issues with me (very
> low file-size limits and batch upload restrictions) and another set of
> issues with internet explorer compatibility was raised with someone else.
> Also, I noticed either a feature or a bug with uploading identical files. I
> don't want the revision rolled when the exact same file is uploaded over
> again, but that seems to be what happens.
> Since OpenKM hasn't "gone public" quite yet, I'll put the documents up on
> the website and in the feed.
> -Michelle W5NYV
>
> ----- Original Message ----
> From: Matt Ettus <matt at ettus.com>
> To: Howie AB2S <howie at aosusa.com>
> Cc: Namaste-dev at amsat.org
> Sent: Wednesday, May 28, 2008 10:06:02 PM
> Subject: [Namaste-dev] Re: link budget
>
> Howie AB2S wrote:
> > OK, I know I am coming to the table a little late and I may have
> > missed something, BUT... from what I have been able to gleen from the
> > information posted so far; the satellite transponder will be a bent
> > pie (no onboard regeneration), with a global beam (about 18 dBi
> > antenna) and a 20W SSPA (EIRP about 31 dBW). The small ground station
> > will use a .5M antenna and 10W SSPA (EIRP 37 dBW). Using this
> > information and assuming typical Intelsat performance parameters of
> > SFD (Saturation Flux Density) of about -78 dB/m2, G/T of 0 dB/K and
> > modest Input and output back-off on satellite transponder, this link
> > will not work if these two stations are trying to communicate in
> > anything other than possibly CW. Given all of the above assumptions,
> > the nearest thing to a practical point to point link that I can come
> > up with is 16 kbps using 10 Watts and 2.4M (6') antennas at each end,
> > this was assuing a threshold Eb/N0 of 4.3db and BPSK modulation. So
> > what am I missing here? ........Howie AB2S
>
>
> The ACP will definitely not be a bent pipe.  It will be demodulation,
> multiplexing, and remodulating the packets which are sent up to it.  It
> will act more like an ethernet switch than a repeater or transponder.  I
> don't know if you have access to the new OpenKM server that Dave put up,
> but if you do, you can read my docs.  I have several presentations up
> there, plus some air interface proposal documents.  In case you don't
> have access, I have attached a presentation I have given a number of
> times about the ACP.  It is longer (but slightly older) than the one I
> gave at Dayton.
>
> We are also hoping to have more like 50W of power out of the ACP.
>
> Matt
>
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>



-- 
The only thing we have to fear is whatever comes along next. -- Austin Cline
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