[CQ-Contest] Skimmers, antennas, power, competitors

[Ria Jairam]

Hi Jose,

I notice RBN also has similar capability to compare stations. Check out out.


73
Ria, N2RJ

On Fri, Dec 29, 2017 at 10:13 AM, José Nunes CT1BOH <ct1boh at gmail.com> wrote:
> Hello
>
> I set-up a public.tableau account with the 7 million skimmer RBN spots
> during 2017 CQWW CW Contest
>
> Go to this link
>
> https://tinyurl.com/y8jhn27r
>
> In the page you can compare Contest Calls in the different skimmers world
> wide.
> You can compare your signal against your competitors, check if claimed
> power makes sense, understand antenna performance, etc.
>
> The graph plots for every band, and for every hour of the contest, the
> hourly median SNR signal of selected contest calls, for a selected skimmer,
>
> I will give some examples:
>
> The link opens with CR3OO versus CR3W on 40 meters, as heard by KM3T-2
> Skimmer (a very active and reliable East Cost Skimmer).
>
> Notice that CR3OO is constantly stronger than CR3OO during the two days of
> the contest, except the last 3 hours of the contest. Although CR3OO was
> just using an Inv. V the location is fantastic towards the USA, and much
> better than CR3W, but there was a minor storm and the dipole fall from the
> tree to the ground. So there was only the beam fixed to Europe. That
> explains why CR3OO signal dropped considerably during the last three hours.
>
>
> Now select a European skimmer on the right of the screen. For example DL3KR
> a very active skimmer. You will notice that there is no big difference
> between signals of CR3OO and CR3W, except again at the end of the contest.
> Was CR3W beam just to USA?
>
> Another example:
>
> Remove CR3OO and CR3W from Contest Call list (mouse over each call and
> click the X) and add K3LR and W3LPL, and select DL3KR skimmer
>
> It is interesting to note that W3LPL is stronger at DL3KR skimmer during
> the night both days.
> Both K3LR and W3LPL are big stations. Why is there such a difference?
> Probably different take-off angles of antennas set-up?!
> Also interesting that in first day, after 07Z K3LR becomes stronger.
> Is is because of different take-off angles due to after sunrise in Europe?
> Or is it because K3LR keeps the stack into Europe and W3LPL puts the stack
> into Asia?
>
>
> Last example
>
> Can we use this tool to check if competitors are using adequate Power
> according to claimed category?
>
> Lets select 40 meter for band, CR3OO, CR3W and CT9/OK6RA for contest calls
> and select DL3KR skimmer
> Both CR3OO and CR3W use 1.5K, but CT9/OK6RA is claiming low power 100W
> We look at the graph and everything makes sense. Good!
>
>
> Enjoy and Happy New Year to all
> CT1BOH José Nunes
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> --
> José Nunes
> CONTEST CT1BOH - http://www.qsl.net/ct1boh
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