Curiouser and curiouser.
The dB values ought to be the same whatever the mode. The assumption
that it was normalised to 2500Hz automatically would have assured
that.
But you have a very clear differeence that even exceeds the ratio of bandwidths.
There is definitely something else going on in the decoder and
measurement of S/N Perhaps in the method used to estimate S/N
What a pity Mr Ros is so unwilling to share the innards of his work to
explain what.
I've just been reading up on the new PSK2k Meteor Scatter waveform by DL5HG
http://www.dk5ew.de/2012/01/13/psk2k-a-new-meteorscatter-mode-by-dj5hg/
There everything is described in precise details, the waveform
description and reasoning behind the pulse shape, how the data is
encoded, the error correction, interleave everything. A shining light
to how amateur datamodes should be presented.
Andy
www.g4jnt.com
On 20 January 2012 16:58, Albert <[email protected]> wrote:
>
> Mike, Andy
>
> Reports from today. I was curious what the difference would be between op8
> and 32.
>
> 13:58 136 PA0A de G3XDV Op8 465 km -14 dB in Welwyn, IO91VT
> 13:49 136 PA0A de G3XDV Op32 465 km -7 dB in Welwyn, IO91VT
> 13:16 136 PA0A de G3XDV Op8 465 km -18 dB in Welwyn, IO91VT
> 12:24 136 PA0A de G3XDV Op8 465 km -17 dB in Welwyn, IO91VT
>
> Albert PA0A
>
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