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From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <57DFBEB8.7010207@lineone.net> <E6CEB6CECE844CDDB328F9470A044D6F@AGB> <57E03937.2090308@lineone.net>
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Date: Mon, 19 Sep 2016 21:08:07 +0100
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Subject: Re: LF: A few reports Sept 18th to 19th
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Hi Hugh

Its a little messy , when stations  use half of the  system ,  its possible 
to enter the  dynamic list , by running  the opera app and clicking Tx  on 
136 and/or 477, once in the  list, random noise can  trick the  comparator, 
to show a  match,  the  tell tail is the  time and if the  station is using 
a fixed frequency , the  recovered  frequency  from the  app should be  the 
same  ..

Its possible, to be spotted  by the  dynamic system and  never  actually TX, 
ie , by up loading a call  , hence the  system  cross  checks  with  other 
users for a  time  match, but this is the  downside of the  extra 5 or 6 dB 
gained  by pattern matching , [136 and 477 only]  , that's the same  for 
any correlation system

73-G

example of time stamp quality check ,

g4wgt has decode at 1929 , DL-SWL has detection, the  spot times  meet the 
check limits = ok

19:29    477 G0NBD de DL-SWL Op8 569 mi -32 dB F:10% in  1502,2 Hz
19:29    477 G0NBD de G4WGT Op8 21 mi -9 dB F:19% in Chorley, IO83qo, 1511.2 
Hz

Ik1HGI decode  with DF8UO , then   qty-3 dynamic spots at the  same  time  = 
ok  as well

19:37    477 IK1HGI de DF1VB Op8 Deep Search -36 dB in Dortmund 1496,1 Hz
19:37    477 IK1HGI de DF1VB/1 Op8 Deep Search -34 dB in Dortmund 1496,3 Hz
19:37    477 IK1HGI de F6CNI Op8 Deep Search -35 dB in JN19QB

19:36    477 IK1HGI de DF8UO Op8 -27 dB F:14% in Karlsruhe

random noise  has triggered g4wgt by vk -  '??' = false  g4wgt not sending 
at this time

18:29    477 G4WGT de VK3XHM Op8 Deep Search ?? -37 dB in Melbourne 
Australia 1503.4 Hz

'??'  Not known , if the  next  spot from df1vb/1 shows  1510 Hz , then is 
valid , if not = false

18:12    477 G0NBD de DF1VB/1 Op8 Deep Search ?? 465 mi -37 dB in Dortmund 
1510,0 Hz

My local spots for df1vb = same  frequency = ok

19:48    477 DF1VB Op8 Deep Search -35 dB 1496.1 Hz
18:42    477 DF1VB Op8 Deep Search -36 dB 1496.1 Hz
--------------------------------------------------
From: "LineOne" <dhchurch@lineone.net>
Sent: Monday, September 19, 2016 8:15 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: A few reports Sept 18th to 19th

> Hello Graham.
>
> It was a suspect positive at 1702 but it's a bit too late to double check 
> the dynamic list and other receiving stations though I recall 
> transmissions were listed at several times in succession but differ from 
> my report. I suppose there are other possibilities such as his entering 
> the wrong frequency. Rightly or wrongly my posting was only information 
> for the sending stations and I naturally rejected all the other suspect 
> reports.
>
> 73, Hugh, M0DSZ
>
> On 19/09/2016 16:27, Graham wrote:
>> Hugh
>>
>> For the  call  to be  in the  dynamic list , it has to be  either by  the 
>> TX station  using the  opera  app and  setting TX with 136  selected , 
>> the web - beacon will  update the  system , or QTY 2 decodes of the  same 
>> call by other  stations ...
>>
>> The call  must of  been  in the  list , for  you to spot it .. [ dynamic 
>> only compares the  call's  listed ]
>>
>> If the  class  cannot  use 136 , then  its possible  you  have a false 
>> positive
>>
>> Where you the  only  station to  see  the  call  at 17-02 ? if so, then 
>> the web linked  spot  would of been  stamped  '??'
>>
>> 73-G,
>>
>>
>>
>>
>> --------------------------------------------------
>> From: "LineOne" <dhchurch@lineone.net>
>> Sent: Monday, September 19, 2016 11:32 AM
>> To: <rsgb_lf_group@blacksheep.org>; <hugh@dhchurch.eclipse.co.uk>
>> Subject: LF: A few reports Sept 18th to 19th
>>
>>> A few reports overnight from Sept 18th to 19th:
>>>
>>> WSPR15
>>> 1600  -13   0.8    0.137620    1   DK7FC         JN49     30
>>> 1630  -14   0.8    0.137620    0   DK7FC         JN49     30
>>> and then consistently until:
>>> 2330  -12   0.4    0.137620    0   DK7FC         JN49     30
>>> 0030  -34   0.4    0.137603    0   R7NT          KN97     53
>>> 0230  -35   0.4    0.137603    0   R7NT          KN97     53
>>> 2145   -9  -0.6    0.137623    0   G8HUH         IO81     20
>>> 2215  -11  -0.9    0.137623    0   G8HUH         IO81     20
>>>
>>> WSPR2
>>> 0850  -32  -0.5    0.137459    0   DF1VB         JO31     13 437
>>>
>>> OPERA32
>>> 17:02  -42         1468.4 Hz      DO5JWA
>>> (deep search: appears to be correct)
>>>
>>> Hugh, M0DSZ
>>>
>>
>>
>
>