[Moon] [Moon-net] HB9BBD, DF2ZC, etc

[SV3AAF Petros]

Dear Klaus,

Thank you very much for providing once more (as you did numerous times in Dubus magazine in the past) accurate and credible facts on how deep search module of JT65 works.

73, Petros sv3aaf

DJ5HG <v.d.heide at on-line.de> wrote: 


Dear Dominique, dear Bernd,

Dear EME community,


as a reply to some statements made on this 
reflector I want to express the following:

(1) It is a fact that the "modern correlation 
scheme" as used in JT65 deep search needs the 
prior knowledge of a limited set of possible 
messages. The amount of information that can 
be communicated with the usual list is less 
than half of that of a single callsign.

(2) The fundamental problem in a QSO is to get 
the knowledge what already has been received 
at the other end, i.e. at what stage the other 
station is. In a minimal QSO this meta-knowledge 
is one bit only. From each reception the operator 
must make the decision between "yes he got it" 
and "he did not get it or I don't know". 
If this one bit of basic information is sent 
via the internet, then the dialog is completely 
running on the internet while the radio path is 
used for a physical measurement and not for 
communication. As a consequence, any use of the 
internet in a time window around a radio contact 
clearly invalidates this contact as a QSO. This 
even is true if someone sends his "TNX for QSO" 
via the internet while the other is still sending 
the the final RRR.

The internet is a fine medium to communicate 
problems and solutions of our hobby, especially 
to help newcomers in EME. But an EME-QSO is a 
challenge. It should be a challenge to reach 
the requirements of a QSO, not to find ways 
to reduce the requirements.

There is a basic difference between identifying 
a signal and receiving information. What finally 
is written into the log clearly is information. 
I wonder if there is any doubt that all this 
information must be communicated via the radio 
path. 


73,

Klaus, DJ5HG


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