One of my missions is to get gnu radio running on my Mac
I have airspy RTLSDR and perhaps lime SDR
Andrew
----------------------------- Sent from my iPhone Andrew Rich e [email protected] w www.tech-software.net m 0419 738 223
On 24 Sep 2016, at 02:52, Edson W. R. Pereira [email protected] 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 [email protected] 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 [email protected]. 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