[amsat-bb] ISS ping box (now PBB

[Andrew Rich]

One of my missions is to get gnu radio running on my Mac

I have airspy RTLSDR and perhaps lime SDR 

Andrew

-----------------------------
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Andrew Rich
e vk4tec at tech-software.net
w www.tech-software.net
m 0419 738 223

> On 24 Sep 2016, at 02:52, Edson W. R. Pereira <ewpereira at gmail.com> wrote:
> 
> Hi Dani,
> 
> I have been following with great interest the commissioning of BEESAT and
> am looking forward to experiment with the digipeater onboard. Daniel,
> EA4GPZ, has implemented a very nice modem for BEESAT in gnuradio (
> https://github.com/daniestevez/gr-satellites). I have tested it with some
> audio samples recorded by Jan, PE0SAT. It works very well.
> 
> It would be very nice if a similar type of experiment could replace the
> ancient AX.25 digipeater onboard the ISS.
> 
> 73, Edson PY2SDR
> 
> 
> ---
> - We humans have the capability to do amazing things if we work together.
> - Nós seres humanos temos a capacidade de fazer coisas incríveis se
> trabalharmos juntos.
> 
>> On Fri, Sep 23, 2016 at 10:59 AM, Dani EA4GPZ <daniel at destevez.net> wrote:
>> 
>>> El 23/09/16 a las 14:22, Edson W. R. Pereira escribió:
>>> What would be required (from the point of view of paper work, logistics,
>>> approvals, etc.) to replace the current ISS packet radio TNC by a device
>>> that would implement some more efficient digital communications? The
>> device
>>> could be a digipeater, but employing strong FEC and a more modern
>>> modulation and framing structure and perhaps some better scheme for
>> channel
>>> access. Perhaps something similar to ngham.
>>> 
>>> https://github.com/skagmo/ngham
>>> 
>>> With FEC and higher speed, we could accommodate many more users on a
>> single
>>> pass. A dedicated software application on the ground would implement the
>>> modem and process information -- separating different types of messages
>> in
>>> different screens, providing a chat like mode for real-time
>> communications,
>>> automatically forwarding APRS packets, etc.
>>> 
>>> Am I day dreaming?
>> 
>> Hi Edson,
>> 
>> You're not daydreaming that much. The BEESAT satellites have a
>> digipeater using the Mobitex-NX protocol, which has some form of FEC.
>> 
>> Many other satellites on the Amateur bands transmit telemetry using
>> strong FEC. For instance, AAUSAT-4 uses an r=1/2, k=7 convolutional code
>> and (255,223) Reed-Solomon with CCSDS scrambling.
>> 
>> Support and experimentation for these and many other protocols is very
>> easy today using SDR.
>> 
>> 73,
>> 
>> Dani.
>> 
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb