Message-ID: <002e01d0304e$1368c500$6401a8c0@JAYDELL>
From: <jrusgrove@comcast.net>
To: <rsgb_lf_group@blacksheep.org>
References: <54B6D3D8.7070000@kpnmail.nl> <7A64238C4EA44F11B7BB8CDA9687EC2A@AGB>
Date: Wed, 14 Jan 2015 18:01:47 -0500
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Subject: Re: LF: Opera -Just a 2 mins carrier gives ghost detection.
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Status: O

> More than  one  detection/decode  is  then  used  to  certify the  spot.

Certify the spot? The fact that someone else somewhere received a spot means that your spot 
certified good? Really? No further corroboration necessary?

With DF6NM's OPDS system there's the correlation % and dB 'certainty' indicator, an accurate time 
indicator of the transmission and a highly accurate frequency readout that are all used for 
corroboration.

Jay W1VD  WD2XNS  WE2XGR/2


----- Original Message ----- 
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, January 14, 2015 4:17 PM
Subject: Re: LF: Opera -Just a 2 mins carrier gives ghost detection.


> Jan,
>
> As posted , any decode  in dynamic , will  only  show  calls  from the  list , this  is the  bill 
> for  the  extra  5/6 dB  gain ..
> your spots  are  pre-fixed   with  ''??''   this  is  added  by  the web-linked  system and 
> denotes  a  unique  detection , false Opera  decodes have  a  call  sign  format  , with  random 
> characters.
>
> Deep Search ??
>
> More than  one  detection/decode  is  then  used  to  certify the  spot
>
> To  check  the  validity ,  you  can  use  the  psk-data  base , which holds  the  web-tx beacon 
> and  rx-spot time  stamped ,  Opera 8 Dynamic resolves  in 0>2  mins  , Op32Dy  2 >5 Mins  after 
> tx /end/decode
>
> Otherwise , the  system  provides  the  quality  check ...
>
> false ....
> 19:31    477 SV8CS de NL9222 Op8 Deep Search ?? 1260 mi -35 dB in Mijdrecht with 0.1w + Marconi 
> "T"
>
> Ok ...inside  the 2<>5 Min  processing  time  for  op32 dy , G3XDV validating  the  tx  /rx  time
>
> 20:21    136 G8HUH de EA5DOM-RX Op32 Deep Search 889 mi -41 dB in Albir RX Site
> 20:17    136 G8HUH de G3XDV Op32 124 mi -13 dB F:0% in Welwyn IO91VT
>
> 73-G,
> --------------------------------------------------
> From: "pa3abk" <pa3abk@kpnmail.nl>
> Sent: Wednesday, January 14, 2015 8:38 PM
> To: "blacksheep" <rsgb_lf_group@blacksheep.org>
> Subject: LF: Opera -Just a 2 mins carrier gives ghost detection.
>
>> This eve I monitored MF Opera, however my WSPR timer was operational the same time giving a 2 min 
>> carrier at h10, h30 & h50.
>> Sorry for the unwanted QRM, however to my surprise NL9222 detected following:
>> 18:51    477 SV8CS de NL9222 Op8 Deep Search ?? 2027 km -35 dB in Mijdrecht with 0.1w + Marconi 
>> "T"
>> 19:11    477 LA3EQ de NL9222 Op8 Deep Search ?? 693 km -37 dB in Mijdrecht with 0.01w + Marconi-T
>> 19:31    477 SV8CS de NL9222 Op8 Deep Search ?? 2027 km -35 dB in Mijdrecht with 0.1w + Marconi 
>> "T"
>>
>> NL9222 is 42km from me and receives my sigs at +1dB
>>
>> No other stations detected these stations. I assume they were not QRV either.
>> Maybe on LF?
>>
>> I have the feeling that Opera DS is acting more human than desired.
>> It's the same when a CW human taker is decoding a plain language text in heavy QRM at QSA 0.
>> You assume that certain patterns is forming a plain word which match the look_up table you have 
>> stored in your brain.
>>
>> Jan/pa3abk
>>
>> -- 
>> pa3abk <-> dordrecht jo21it
>> Sent by Philips STB-75 with T100
>>
>>
>