[CQ-Contest] Summarizing the Skimmer Accuracy Thread

[VR2BrettGraham]

S56A added:

> VR2BG/p wrote: How many wrong frequency spots are there on RBN?
>
> I had short 10 minutes CQ run in ON UBA CW contest this morning with 100 W
> and tribander on 14025,75 kHz.
>
> RBN had 3 spots on 14025,7 kHz, 31 spot on 14025,8 kHz and 10 spots on
> 14025,9 kHz. No bad spots.
>
> They all fit within my sharp 250 Hz CW filter on third 455 kHz IF. No 
> sweat
> apart from occassional zero beat.

No wrong-freq RBN spots of me from XV when I was there last summer, 
Marijan - but I was barefoot too & far enough away from all the skimmers 
for any of the mechanisms behind the wrong-freq spots to manifest 
themselves, IMHO.

Instead, take ALL the RBN spots for an entire day & then look for same 
call (not just your own) spotted at exactly the same time on either a 
different band or frequency (say >1 kc away) from any other spot of the 
same call.

I need to correct my previous post - when looking for spots NOT at 
exactly the same time, you will find one wrong-freq spot matches up with 
multiple correct-freq spots.  If you look for spots at EXACTLY the same 
time, they tend come in pairs (a correct one matches up with the wrong 
one; also wrong one matches up with the correct one), so total number of 
wrong-freq spots can be found by dividing by two.  To get a feel for how 
bad it is in a more realistic within-a-minute-or-two-of-each-other (or 
possibly where call is same other than one character) is beyond my 
ability with this new-fangled database stuff.

It could be that during the five minute period I found on 2012-03-08 
where UA9CDC was spotted on three different bands, Igor was really 
there.  Or maybe he had one of those fecal signals he mentioned in his 
post... though there is a mechanism responsible for 
same-or-close-kc-but-different-Mc RBN spots.

Though every non-weekend day I've looked at RBN data I see all the 
various wrong-freq spots & if there was a way to get a feel for how many 
they were & that were added to all the busted call spots, I believe the 
total is more significant than the techno-crowd would like to admit.

73, ex-VR2BG/p.