[Skimmertalk] Help--What's Going On?

[Mark n2qt]

The call detection algorithm can be a bit fussy.   I watched vp9/wa4pgm roll 
in on
6M for ages with a good signal and good decoding on screen.  However he was 
never
spotted with the full call, just a couple of times with wa4pgm.  I added 
vp9/wa4pgm
to the watch list (which does seem to help with the /B beacons) but still 
nothing.
I had the skimmer set to aggressive, a second skimmer running normal did 
much
better, but also has more busted spots than I feel comfortable putting out 
on the RBN.
Alex said he used a call history file to develop his algorithm so it seems 
likely that
the more uncommon call structures have a higher decode threshold.

Mark n2qt



-----Original Message----- 
From: David Robbins
Sent: Wednesday, July 18, 2012 12:29 PM
To: Skimmertalk at contesting.com
Subject: Re: [Skimmertalk] Help--What's Going On?


well, that may be part of it, but not all since my skimmer doesn't use the 
supercheck file.  maybe there is something in the call validation logic that 
is more sensitive to the 2x2 call?  or some kind of sending quirk that the 
skimmer can't figure out??   maybe try some variations with extra half 
spaces in the ws7sx call to break it up differently.

Jul 18, 2012 12:06:16 PM, k1ttt at arrl.net wrote:


let me guess, you see more spots with one call than the other??? most likely 
skimmers that are using the supercheck database are finding one call in the 
database but not the other one so it doesn't get spotted.

Jul 18, 2012 11:56:55 AM, w6sx at arrl.net wrote:

Good Morning All,

I have a club call which I sometimes use to tweak RBN for propagation
checking. But I am often surprised by the lack of hits.

Last night I ran tests with both W6SX and WS7SX. I alternated TEST TEST
TEST W6SX W6SX W6SX TEST and TEST TEST TEST WS7SX WS7SX WS7SX TEST numerous
times on various bands. Everything was the same: power, speed, memory keyer
with auto character space. To see results, use Search Spots by Callsign.

What's going on?

Ski Exuberantly,

Hank, W6SX

Mammoth Lakes, California

Elevation 8083 feet in John Muir's Range of Light
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