[amsat-bb] Re: AO-51 repeater back in operation

Mark L. Hammond marklhammond at gmail.com
Sun Sep 13 15:56:28 PDT 2009

Hi Andrew,

AO-51 is essentially a "next generation" PACSAT.  Each craft runs its own OS, which are all similar. Google Harold Price NK6K and you'll find this link: http://www.amsat.org/amsat/sats/nk6k/msatmain.html  It gives a few important tidbits so you can see the general picture of satellites, OS, file systems, etc.

The size of the upload depends on the satellite; usually there are multiple files, and their sizes vary.  In the end, it's something under 1MB in total.  Each piece of code adds more functions.  So, it's a flying computer with CPU and memory and the OS and applications have to be uploaded and started...not a foreign concept for anybody that has installed an application!

Most satellites these days will probably use a the 9600 baud "standard" data rate for uploading.

When you only get a few minutes to upload/test just a few times each day, it takes a while to pull the whole thing off using a 9600 baud RF connection.  

The good news is that Gould is really good at it :)


Mark N8MH


Re: AO-51 repeater back in operation

Subject: [amsat-bb] Re: AO-51 repeater back in operation 
From: "Andrew Rich" <vk4tec at xxxxxxxxxxxxxxxxx> 
Date: Mon, 14 Sep 2009 01:22:11 +1000 

Could you explain a bit about the software load

Operating system

How much you have to upload

data rates ?

Andrew Rich
Airways Technical Officer Grade 4
Surveillance - RADAR ADS-B
Amateur Radio Callsign VK4TEC
email: vk4tec at tech-software.net
web: www.tech-software.net
----- Original Message ----- 
From: "Gould Smith" <gouldsmi at bellsouth.net>
To: <amsat-bb at amsat.org>
Sent: Monday, September 14, 2009 1:13 AM
Subject: [amsat-bb] AO-51 repeater back in operation

>I turned on the main AO-51 repeater this morning (145.92/435.300).  The 
>software reload continues, the software could crash when the last two tasks 
>are loaded and activated.
> 73,
> Gould, WA4SXM for the Command Team

Mark L. Hammond  [N8MH]

More information about the AMSAT-BB mailing list