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

[Mark L. Hammond]

Hi Andrew,

At 10:03 AM 9/14/2009 +1000, Andrew Rich wrote:
>What are the implications of not getting the upload to work ?

The satellite won't work ;)  That's a broad question.  If the satellite is healthy hardware-wise, an upload would be re-attempted (multiple times you can be sure). 

If the uploads don't work--it's time to debug and determine why the uploads aren't working, etc.

>Is there standby memory you check and then swap to the working program ?

In theory, if specific memory locations become useless, they might be programmed around.  But life is probably not so simple!

73,

Mark N8MH



>----------------------------------------------------------
>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: "Mark L. Hammond" <marklhammond at gmail.com>
>To: <amsat-bb at amsat.org>; <vk4tec at tech-software.net>
>Sent: Monday, September 14, 2009 8:56 AM
>Subject: Re: [amsat-bb] AO-51 repeater back in operation
>
>
>>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 :)
>>
>>73,
>>
>>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]
>
>
>--------------------------------------------------------------------------------
>
>
>
>No virus found in this incoming message.
>Checked by AVG - www.avg.com
>Version: 8.5.409 / Virus Database: 270.13.95/2368 - Release Date: 09/13/09 17:50:00


Mark L. Hammond  [N8MH]