Re: LF: 8269.9 kHz EbNaut 27/12/17

[Markus Vester <markusvester@aol.com>]

Hi Dex,

correlation processing is relatively cheap, so no harm done ;-)

> No stacking allowed when message is known.

I politely disagree. A decode made after stacking blindly with constant phase and weights (or weights derived solely from noise level) hasn't made use of a priori information of the correct result. Correlations are ok, but their output should not be used to tweak the phases before stacking. As Paul mentioned earlier, stacking a large enough number of tweaked-phase data sets will eventually produce any desired decode from pure noise. 

Best 73,
Markus

iche Mitteilung-----
Von: Dexter McIntyre W4DEX <dexter.mc@gmail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 28. Dez 2017 14:32
Betreff: Re: LF: 8269.9 kHz EbNaut 27/12/17

The message was changed.  No stacking allowed when message is known :)  

Sorry for the confusion and wasted processor time.

Will repeat tonight WX premitting.

Dex

On Wed, Dec 27, 2017 at 4:29 PM, Dexter McIntyre W4DEX <dexter.mc@gmail.com> wrote:

New message tonight

3 chars 16K21A CRC20
30 second symbols
Start 22:30 UT

Dex

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