[Vk5-wx-sonde] M20

[Mark Jessop]

Hi Bev,

The best I can really point you at is the code for the decoder I'm using:
https://github.com/rs1729/RS/blob/master/demod/mod/mXXmod.c
I've dropped a M20 sample here: https://rfhead.net/sondes/samples/m20.wav

Cheers,
Mark

On Thu, Dec 31, 2020 at 12:49 AM Bev M Ewen-Smith via Vk5-wx-sonde <
vk5-wx-sonde at vk5fo.com> wrote:

> Hi Mark
>
> We are stuck in Portugal this year thanks to Covid-19.  :-(  You seem to
> be in the Lucky Country in more ways than one!
>
> I have had an email from someone in central Europe wanting to decode the
> M20 radiosonde with SondeMonitor.
> In the past you have been kind enough to point me in the direction of
> some hints regarding telemetry formats and I wondered if you had any
> information about the M20 format.
>
> It seems to look broadly similar to the M10 with a trigger byte of 0x45
> instead of 0x64 and the following byte 0x20 (M20?), which is the byte
> that distinguishes the M2K2, M10, etc. but the rest of the frame looks
> rather different.
>
> The audio sample the user has sent to me is rather scratchy so I am not
> making a lot of progress working from the binary.
>
> Any suggestions would be very welcome.
>
> Happy New Year to you and we all hope 2021 is better than 2020!
>
> Regards
> Bev
> COAA
>
>
>
>
>
>
>
>
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