[OZAPRS] alternative to KA9Q NOS ?

[Carlos]

Hi Tom,

I was thinking in one of those 915 MHz modules (frequency hopping, 1 W)
they sell for drones. They seem to be perfectly legal in VK, and provide 64
kbps.

Very good point about some of the parameters "hard coded" in the kernel.

HTTP at 1200 bps must be like watching paint dry I guess...

73,
Carlos VK1EA



On Tuesday, November 6, 2018, Thomas Karpiniec <tk at 1.21jiggawatts.net>
wrote:
> 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
>
> Tom VK7NTK
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