Message-ID: <555CF143.9090403@freenet.de>
Date: Wed, 20 May 2015 22:40:35 +0200
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: MF 630m: False Decode or Real?
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Hi Jochen,

I think the discussion about Opera's own 'deep search' mode (or whatever 
the proper name is) was done here (or on "the other" reflector) over a 
year ago, and the main problem I see is that the 'real time web-based 
exchange' of currently active stations means fooling oneself.
Consider this: You know there are only four possible callsigns which 
have been transmitting, so in reality the software only has to decide 
for a TWO BIT number. Much easier than "really" decoding the entire 
number of message bits in an Opera message.

In my very personal point of view, this 'real time web exchange of 
stations (calls) which are currently transmitting' should not be used at 
all.
For comparison, Markus' (DF6NM's) own deep search uses a quite large 
table which is *static*, which means that his decoder has no chance to 
play unfair (because it doesn't know who's currently active or not), and 
it also doesn't know what others receive (over the internet). What I 
don't know is how many stations are currently in that list, and thus how 
many bits the algorithm effectively has to "decode" (well, it doesn't 
really decode, it also makes a best guess from a limited number of list 
entries to chose from).

All the additional data which look as if they were "decoded" (eg "VK3ELV 
... 140w + Top loaded L 18m vert 80m horz") have been taken from a 
database (***including the callsign***), not radio .. the only real 
information  is the '- 37 dB' report, and the two question marks which 
imho may as well have been ten or twenty (considering the season and the 
distance).

Well just my two pence of wisdom. I don't use Opera and don't think I 
ever will.

Cheers,
   Wolf .


Am 20.05.2015 22:03, schrieb J. Althoff:
> Hi Wolf,
>
> You are not disappointing me at all. I put this issue under discussion myself.
>
> Please share your opinion about this to this topic to us in detail. Maybe I missed
> A discussion about this before, but I am very interested in arguments about this
> Topic.
>
> Thanks, Jochen
>
>
>     -= DF1VB =-
>    -= KH2MM =-
>   Jochen Althoff
>   df1vb@gmx.de
> +491712020206
>
>
>> Am 20.05.2015 um 21:44 schrieb wolf_dl4yhf <dl4yhf@freenet.de>:
>>
>> Sorry to dissapoint you but .. no, no, no, and again, no.
>>
>> 73,
>>   Wolf
>>
>> Am 20.05.2015 20:02, schrieb Jochen Althoff:
>>> Just popped up at my RX:
>>>
>>> 17:52    477 VK3ELV de DF1VB/3 Op8 Deep Search ?? 16348 km -37 dB in Dortmund with 140w + Top loaded L 18m vert 80m horz
>>>
>>> Any comments welcome
>>>
>>> 73, Jochen
>>
>
>