[amsat-bb] ISS ping box (now PBBS)

John Brier johnbrier at gmail.com
Fri Sep 23 14:14:43 UTC 2016

There is already work being done to replace the old Ericsson HT with a
customized Kenwood D710. Not sure what digital setup will be

73, John Brier KG4AKV

On Fri, Sep 23, 2016 at 9:59 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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