Graham, thanks for the useful info. I have sent you a direct email
with some constructive suggestions.
One snag with false decodes of this type is that you don't know they
are false unless the sender denies he was sending (or propagation is
impossible) at that time, so there will be statistically far fewer
reports of false decodes than there are in reality. I transmitted
four times in the last 24 hours and there were two additional decodes
falsely carryng my callsign in the same period. That's two out of a
total of six, ie 33%.
regards
Mike
=====
> Some points Mike
>
> 200%F is a bodge to get the text beacon via the server , not
> showing in my latest spot listing ?
>
> JA8SCD de SWL-JA8SCD/1 (): Op32 0 mi -41 dB in Tokyo with 0w +
> 16:29 136 JA8SCD de JA8SCD/1 Op32 Deep Search 0 mi -41 dB in Tokyo
> with 0w +
>
> 4 Min processing delay showing in these detection's
>
> 16:15 136 LA3EQ de G4WGT Op32 Deep Search 468 mi -43 dB in Chorley,
> IO83qo, with 0.2w + Marconi-T 16:11 136 LA3EQ de G8HUH Op32 605 mi
> -34 dB F:15% in Somerset with 0.2w + Marconi-T
>
> 17:23 136 LA3EQ de GW0EZY Op32 Deep Search 541 mi -42 dB in
> Welshpool IO82ho with 0.2w + Marconi-T 17:23 136 LA3EQ de 2E0ILY
> Op32 Deep Search 505 mi -42 dB in Shropshire IO82qv with 0.2w +
> Marconi-T 17:19 136 LA3EQ de G8HUH Op32 605 mi -33 dB F:1% in
> Somerset with 0.2w + Marconi-T
>
>
> >> Nothing can be 100% , Dynamic detections , will show 1
> >> minuet after conventional OP8 and 4 minuets after a
> >> conventional OP32 decode , this is due to data processing
> >> time and is a fixed off set , Time can be used as a reality
> >> check
>
>
> There are now two entirely different systems packaged in the
> one application , the original Opera data mode , which is
> capable of presenting the fade pattern and the s/n , the other
> relies on call matching and presents s/n only , hence the
> 'odd' 200%F , the dynamic search has been trailed on normal 'ham'
> kit and provides an extension to the existing system .
>
> Before any variations are attempted , off air stats are needed
> , there was close to 100 instances of V155 in use since its
> launch , with only 1 error that would be 1% . Occurrences will
> be statistically related to user numbers
>
> Where it is unfortunate 'real' calls are produced , the time
> delay presents a simple , at a glance spot-check , the integrity of
> the original system has not been compromised, at the moment the
> list has a 8 day life , this could be reduced , but with the 7
> day operating cycle , 8 provides overlap
>
> 73-G,
>
>
>
> --------------------------------------------------
> From: "Mike Dennison" <[email protected]>
> Sent: Wednesday, January 07, 2015 3:37 PM
> To: <[email protected]>
> Subject: Re: LF: New version OPERA >> ''Opera Dynamic'' <<
>
> > Sorry, Graham, but you are wrong. Last night's results did not "give
> > a good working compromise between real and false detections." There
> > were several very plausible but false decodes. These appeared much
> > more frequently than they do on OPDS which in any case gives enough
> > additional information on signal quality to be able to spot most
> > false decodes. It's a nice idea, but the real/false threshold is set
> > much too far towards 'real', making the resultant information next
> > to useless.
> >
> > And what is the "200%" fade figure all about? I am 1000% sure I
> > don't know.
> >
> > Mike, G3XDV
> > ==========
> >
> >> All,
> >>
> >> Other than the odd false spot , that looked to be quite a
> >> good launch for the new addition to Opera
> >>
> >> Nothing can be 100% , Dynamic detections , will show 1
> >> minuet after conventional OP8 and 4 minuets after a
> >> conventional OP32 decode , this is due to data processing
> >> time and is a fixed off set , Time can be used as a reality
> >> check .
> >>
> >> Dynamic compares Call Signs with activity , to provide the
> >> lowest possible detection levels , to do this , Opera
> >> changes mode to give a second chance detection , based on
> >> s/n , The detection threshold has been set to give a good
> >> working compromise between real and false detections.
> >>
> >> Noting , each individual transmission is processed independently
> >> , Conventional and Dynamic processes are running in
> >> parallel
> >>
> >> 73-Graham
> >> G0NBD
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> From: Graham
> >> Sent: Tuesday, January 06, 2015 8:38 PM
> >> To: [email protected]
> >> Subject: LF: New version OPERA >> ''Opera Dynamic'' <<
> >>
> >>
> >> New version of opera up-loaded
> >>
> >> Opera Dynamic: Introduces the first, adaptive multi mode
> >> Beacon decoding/detection system , seamlessly taking over from
> >> the Opera data decoder and dynamically configuring the low
> >> level detector.
> >>
> >>
> >>
> >> Opera Dynamic is configured for MF OP8 and LF OP32 ,
> >> providing
> >> a dynamically configured low level detection mode ,
> >> complimenting the Opera Data mode ,
> >>
> >>
> >>
> >> Opera Dynamic forms part of the windows distributed package
> >> ,
> >>
> >>
> >>
> >> 73-Graham
> >>
> >> G0NBD
> >>
> >>
> >>
> >>
> >>
> >> UPLOAD
> >>
> >>
> >>
> >> http://rosmodem.wordpress.com/
> >>
> >>
> >>
> >> SUPPORT
> >>
> >>
> >>
> >> https://groups.yahoo.com/neo/groups/O_P_E_R_A_/info
> >>
> >>
> >>
> >> https://www.facebook.com/groups/operadatamode/
> >>
> >>
> >>
> >> -----
> >> No virus found in this message.
> >> Checked by AVG - www.avg.com
> >> Version: 2015.0.5577 / Virus Database: 4257/8885 - Release Date:
> >> 01/07/15
> >>
> >
> >
> >
>
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2015.0.5577 / Virus Database: 4257/8885 - Release Date:
> 01/07/15
>
|
