[Skimmertalk] [N1MM] Re: Frequency (volume) of Spots (OT)

[Luc PY8AZT]

Pete,

I thought about it. We use three stations (3x756Pro3 and 3xAlpha PAs
99, 91b and 374). The 374 is very old and could be a problem, but this
station isn't in CQ any time. We sent CW by USB-Serial interface.

I was running all the time and I try to solve it in many ways. I've
got GW7T spots even after chance de CQ message to "CQ TEST PW7T PW7T"
or "TEST PW7T PW7T", slowdonw, faster, etc...

So, when I got busted I stoped the nonsense dupe pileup and send my
call many many times. Next 10min mostly working dupes. So, I gave up
and I got them all again in the log. I worked NR4M 9 times.

No problema... next time, we should get Z-something callsign hi hi hi
or get back to ZY7C, nasty on SSB, but skimmer liked it.

Luc


2010/12/3 Pete Smith <n4zr at contesting.com>:
> Hi Luc - thanks for this.
>
> My hunch would be that perhaps your transmitter is clipping the first
> "dit" just a little - not enough to confuse the human "decoder" but
> enough to throw the machine decoder off.  I had this problem with my
> Winkey until I set 20 milliseconds of lead time to allow my transceiver
> to "get ready" for CW.
>
> The 11-year database is a database of patterns, not of callsigns per se
> - GW7T would certainly be seen as a legitimate call.  Skimmer Server
> does not permit use of the Paranoid validation level, so there is no
> comparison with master.dta being performed.
>
> 73, Pete N4ZR
>
> The World Contest Station Database, updated daily at www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com,
> spots at telnet.reversebeacon.net, port 7000
>
>
> On 12/3/2010 6:17 AM, Luc PY8AZT wrote:
>> 2010/12/3 Pete Smith<n4zr at contesting.com>
>>> Hi Joe - the process for identification of who is CQing is a little more
>>> sophisticated than that. First, Skimmer identifies what it considers
>>> signals on a given band and assigns a decoder to each one. Then the
>>> decoder starts reading the text being sent, looking for such key words
>>> as TEST, CQ, QRZ, QRZ?, and SS. If it finds a key word, it looks for a
>>> callsign within 256 characters after the keyword. If it finds one, then
>>> it looks for that call to be repeated a number of times set by the level
>>> of callsign validation that the owner has specified. It also compares
>>> the callsign with a table of callsign formats derived from 11 years of
>>> cluster spots, again with varying stringency depending on the level of
>>> validation. If it passes all of these tests, then the callsign is spotted.
>>>
>>> Result is that it is pretty clever at finding people calling CQ. The
>>> only case that causes it real problems is when the contest station
>>> simply signs his call, without ever using a keyword. That could be one
>>> reason why some CQers escape the Skimmer net, and we recommend that to
>>> avoid this, stations should add the word TEST every 10 minutes or so.
>>>
>>> 73, Pete N4ZR
>> Pete,
>>
>> I got your email on N1MMLogger, so I moved the topic to Skimmer maillist.
>>
>> At PW7T we've been spoted many times as GW7T. So, in consequence we've
>> got 290 dupes in the log.
>>
>> Reading your message, I didn't get how we were so badly spoted so many times.
>> It's suppose to be:
>> 1) Our TX had some problem in CW - so human brain fix it and called us
>> correctly - I don't think so... but... It can happens
>> 2) The GW7T exist in this spot database (even as wrong spot)
>> 3) Skimmer had some problem to listen to the very first dot, we were
>> calling "PW7T PW7T Test"
>>
>>
>> --
>> 73, Luc
>> __
>> PW7T Team member
>> WRTC.2010 Brazilian Team Leader
>> PY8AZT (also PT7AG, PX8C, ZZ8Z, ZY7C)
>> LABRE, ARRL, CWJF&  Fortaleza DX Group Member
>> __
>> Visit our websites:
>> PW7T: http://www.pw7t.net
>> DXBrasil: http://www.dxbrasil.net
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-- 
73, Luc
__
PW7T Team member
WRTC.2010 Brazilian Team Leader
PY8AZT (also PT7AG, PX8C, ZZ8Z, ZY7C)
LABRE, ARRL, CWJF & Fortaleza DX Group Member
__
Visit our websites:
PW7T: http://www.pw7t.net
DXBrasil: http://www.dxbrasil.net