Message-ID: <6E4F585DCCD348E9B106EF92AB646B4A@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <33CE58375F0E485AA41770E0C8552335@AGB> <21C25792F3E84B2CA4CA3AEBCB7D4011@AGB> <71a26ccf-2a24-26d0-9a7e-aa1485ab1630@n1bug.com>
In-Reply-To: <71a26ccf-2a24-26d0-9a7e-aa1485ab1630@n1bug.com>
Date: Thu, 13 Apr 2017 17:14:43 +0100
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Subject: Re: LF: 136 OP32 LAST 24HR
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Status: O

Thanks  Paul,

Yes , that's  a  full  decode ,  -40 is round the  switch over point ,
The  % fade is  the  amount of lost  'bits'  along  the  time  line ,  the 
graphic , simply  shows , 'where'  the  bits  where 'lost'
A decode or Dynamic  spot  may be achieved with a  loss  up to approx   60% 
of the  data ,  either randomly , or  in block's   along the  time line .
The  displayed  s/n  is the  average over the  Tx period , as  is  the 
Frequency [ recovered  audio] average  of the  Tx

Using Manchester coding ,  There  are  no  synch requirements ,  each  bit 
contains ''data  and  sync''  , so  its  impossible  for the  system to 
loose  lock,  ie,  any bit that  is  recovered is  usable , so  interim's of 
static  / noise ,  the  duration of the  Tx pulse  compared to the  noise 
bursts is  'very long' , this coupled with tailored dsp  routines , provides 
good  performance on the  lower bands ,  as  dose  the 'dispersed'  decoder 
version , deployed at VHF , which provides  immunity  to Doppler  , Luis 
EA5DOM ,  used the  Op1  [ 60 second ]  to achieve  EME on 23 cm , with 
round 50% data loss ,

73-Graham
G0NBD

--------------------------------------------------
From: "N1BUG" <paul@n1bug.com>
Sent: Thursday, April 13, 2017 2:10 AM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: 136 OP32 LAST 24HR

> On 04/12/2017 01:58 PM, Graham wrote:
>> Second decode  for  DF2JP with  N1BUG  , at  -40 could be  either
>> decode or  dynamic  ?
>>
>> 2017-04-12 06 :48:30  DF2JP  AA  N1BUG  FN55MF  0  136  -40  Op32__~40dB
>
> I don't understand Opera very well...
>
> But, I think this was a decode??? On my screen, using opera 1.6.4 in the 
> lower pane it was in red, it did *not* say Deep Search and it said fade 2% 
> with a long row of ---------
>
> -- 
> Paul
> N1BUG  160m-2m         DXCC Honor Roll
> WI2XTC 2200m-630m Experimental license
> FN55mf      ME      Piscataquis County
> http://www.n1bug.com
> http://www.aurorasentry.com
> 

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