[Skimmertalk] FW: Split Down of Skimmer

[Dai NAGAKURA]

de JF2IWL

The agenda (or problem) is that
Compareing RBN with DXA , Skimmer captures many Fakes
which is calling CQ with normal pattern (not DN).

In this case, RBN wolud be never , rather not excact data.
Although split down operation is unique, rare,
I think it had better DN keyword be added skimmer algorithm
in  future.

Dai JF2IWL



On Thu, 24 Mar 2016 12:23:47 -0400
"Jeff Maass K8ND" <jmaass at k8nd.com> wrote:

> 
> The VK0EK  DXPedition does not need RBM  / Skimmer spots. 
> 
> There are more than enough Packet spots to keep them busy for 17 more days. Amateurs who need it can see what bands they are on by looking at their DXA3 web site (http://dxa3.org/) and check their announced frequencies on their web site 'Plan' link (http://vk0ek.org/the-plan/). When they are fully installed, it will not be hard to find them.
> 
> No 'foot shooting' is occurring.
> 
> 73,  Jeff  K8ND
> 
> -----Original Message-----
> From: Skimmertalk [mailto:skimmertalk-bounces at contesting.com] On Behalf Of Andy KU7T
> Sent: Thursday, March 24, 2016 11:22 AM
> To: 'David Robbins' <k1ttt at arrl.net>; 'Bob Wilson, N6TV' <n6tv at arrl.net>; 'Dai NAGAKURA' <ndai at cameo.plala.or.jp>
> Cc: 'SkimmerTalk Reflector' <skimmertalk at contesting.com>
> Subject: Re: [Skimmertalk] Sprit Down of Skimmer
> 
> Has anyone contacted them yet to tell them to not use DOWN?  They are shooting themselves in the foot I guess... 
> 
> Andy
> KU7T
> 
> -----Original Message-----
> From: Skimmertalk [mailto:skimmertalk-bounces at contesting.com] On Behalf Of David Robbins
> Sent: Thursday, March 24, 2016 3:45 AM
> To: 'Bob Wilson, N6TV' <n6tv at arrl.net>; 'Dai NAGAKURA' <ndai at cameo.plala.or.jp>
> Cc: 'SkimmerTalk Reflector' <skimmertalk at contesting.com>
> Subject: Re: [Skimmertalk] Sprit Down of Skimmer
> 
> One of the other recent expeditions was listening down occasionally also... I thought they were doing it as a cw copying test as they had a huge pileup up from their frequency, but were easy to work if you copied the dn.
> 
> David Robbins K1TTT
> e-mail: mailto:k1ttt at arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
> 
> 
> 
> -----Original Message-----
> From: Skimmertalk [mailto:skimmertalk-bounces at contesting.com] On Behalf Of Bob Wilson, N6TV
> Sent: Thursday, March 24, 2016 01:08
> To: Dai NAGAKURA
> Cc: SkimmerTalk Reflector
> Subject: Re: [Skimmertalk] Sprit Down of Skimmer
> 
> Sorry, I should have reviewed my own presentation <http://bit.ly/UsingRBN2015> on this subject.  See slide 22.  Briefly:
> 
> Originally CW Skimmer recognized just: "CQ", "TEST", and "QRZ"
> VE3NEA later added "FD", "SS”, "NA" and "UP"
> 
> If they are listening down instead of up (can't remember *ever* seeing that done before), CW Skimmer will *not* recognize "DN" as a "CQ" and they will not be spotted much.
> 
> Thanks to K6MR for the reminder.
> 
> 73,
> Bob, N6TV
> 
> On Wed, Mar 23, 2016 at 5:13 PM, Dai NAGAKURA <ndai at cameo.plala.or.jp>
> wrote:
> 
> > Thank you Bob , This must be my misunderstanding.
> >
> > Just after VK0EK started , Skimmers cannot copy them then I thought 
> > Skimmer does not recognize callsign when DN(DWN) is just before 
> > callsign.
> >
> > Now I understand algorithm .
> > Many thanks
> >
> > Dai JF2IWL
> >
> >
> >
> > On Wed, 23 Mar 2016 16:48:08 -0700
> > "Bob Wilson, N6TV" <n6tv at arrl.net> wrote:
> >
> > > I do not understand what you mean by "before DN letter".
> > >
> > > If they do not send CQ or TEST, or if they send the callsign only 
> > > once every 10 minutes, or if they send "UP" at a different speed 
> > > than the callsign, they will rarely if ever be spotted by a CW Skimmer.
> > >
> > > 73,
> > > Bob, N6TV
> > >
> > > On Wed, Mar 23, 2016 at 11:02 AM, Dai NAGAKURA 
> > > <ndai at cameo.plala.or.jp>
> > > wrote:
> > >
> > > > World Skimmers cannot caprure VK0EK now Is CW Skimmer Server does 
> > > > not acaputure callsign before DN letter?
> > > >
> > > > Dai JF2IWL
> > > > --
> > > > Dai NAGAKURA <ndai at cameo.plala.or.jp>
> > > >
> > > > _______________________________________________
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> > > >
> >
> > --
> > Dai NAGAKURA <ndai at cameo.plala.or.jp>
> >
> >
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-- 
Dai NAGAKURA <ndai at cameo.plala.or.jp>