[OZAPRS] alternative to KA9Q NOS ?

Thomas Karpiniec tk at 1.21jiggawatts.net
Tue Nov 6 22:09:51 AEDT 2018

Hi Carlos,

On Tue, 6 Nov 2018, at 8:37 PM, Carlos wrote:
> "Linux especially includes all the necessary kernel functions and
> support utilities for TCP/IP over amateur radio systems, as well as
> basic AX.25 and NET/ROM functionality. Therefore, NOS is regarded as
> obsolete by its original developer."
> Do you guys have experience with that, for example, passing real-time
> video from a webcam from one computer to another using a 9k6 bps link

I did a bunch of experiments a while ago with TCP/IP over 1200 baud VHF, including loading larger images over HTTP. It definitely works but it is slow and the Linux kernel has some hard-coded TCP/IP parameters that cause additional problems at low speeds. It would be better at 9600 but still not optimal. JNOS avoids some of these problems by implementing timeouts that are more sympathetic to low bitrate links. IMO a webcam would be optimistic - but something more like SSTV would be achievable for sure.

Cheers & 73


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