[amsat-bb] ISS ping box (now PBB
vk4tec at tech-software.net
Fri Sep 23 17:20:09 UTC 2016
One of my missions is to get gnu radio running on my Mac
I have airspy RTLSDR and perhaps lime SDR
Sent from my iPhone
e vk4tec at 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
>>> could be a digipeater, but employing strong FEC and a more modern
>>> modulation and framing structure and perhaps some better scheme for
>>> access. Perhaps something similar to ngham.
>>> With FEC and higher speed, we could accommodate many more users on a
>>> pass. A dedicated software application on the ground would implement the
>>> modem and process information -- separating different types of messages
>>> different screens, providing a chat like mode for real-time
>>> 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.
>> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership. Opinions
>> are solely those of the author, and do not reflect the official views of
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
More information about the AMSAT-BB