[CQ-Contest] Summarizing the Skimmer Accuracy Thread

[Bryon "Paul" Veal]

I a famous for sending to the rarest DX and multipliers "N0AS" since I still 
use a paddle and after having N0AH, I still can't get the H out 10% of the 
time, or more like 100% to the rare stuff- Could be 10 WPM, or 50 WPM, I 
still screw it up-  Thanks to those of you who realize it is me sending 
"N0AS  N0AH  N0AH, N0AS..........  my guess is that I have melted some of 
the skimmers in heavy traffic from time to time....hihi

Paul  N0AH

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From: "Pete Smith N4ZR" <n4zr at contesting.com>
Sent: Tuesday, February 26, 2013 4:49 AM
To: <cq-contest at contesting.com>
Subject: Re: [CQ-Contest] Summarizing the Skimmer Accuracy Thread

> It also needs to be kept in mind that with rounding taking place at the 
> sending Skimmer's Telnet server, an actual calibration difference of only 
> a couple of Hz can lead to spots being 0.1 KHz apart.  This isn't just a 
> Skimmer issue - in fact, any spotting mechanism that readsthe receiver's 
> frequency can be off by even more - for example, I use a 400 Hz filter to 
> run, and frequently tweak my main tuning control to get out from under a 
> packet pileup.  Any spot I then make can easily be 0.2 KHz or more 
> different from others' spots of the same station.
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network at
> http://reversebeacon.net,
> blog at reversebeacon.blogspot.com.
> For spots, please go to your favorite
> ARC V6 or VE7CC DX cluster node.
>
> On 2/25/2013 9:54 PM, Jim Jordan wrote:
>> There are two explanations for reported frequency variations unless they 
>> are reported at EXACTLY the same moment in time--rx error or tx change. 
>> Many run stations, myself included, if that less than perfect run 
>> frequency becomes even less perfect we will adjust the tx frequency ever 
>> so slightly to try and get in the clear. On the next CQ after that 
>> another skimmer may pick up the new frequency and report that as a new 
>> spot or it may be interpreted as the same spot but a different frequency. 
>> Saw that in ARRL DX CW when I shifted frequency while running at NY4A. 
>> Not sayin' one way or the other, but consider all possibilities.
>>
>> 73,
>>
>> Jim, K4QPL
>>
>> ----- Original Message ----- From: "Pete Smith N4ZR" 
>> <n4zr at contesting.com>
>> To: <vr2bg at harts.org.hk>
>> Cc: <cq-contest at contesting.com>
>> Sent: Monday, February 25, 2013 9:35 PM
>> Subject: Re: [CQ-Contest] Summarizing the Skimmer Accuracy Thread
>>
>>
>>> Bret, send me your data in a form I can look at, and we can have a 
>>> useful discussion.  I can imagine several scenarios for what you 
>>> describe - harmonics, dueling CQs, keyclicks, and so on.
>>>
>>> I'd love to see your data.  Your assertion about 1-2 percent errors is 
>>> totally out of the ball park. The RBN made 3.7 million spots during ARRL 
>>> CW - are you really saying there were 37,000-74,000 erroneous spots? 
>>> Show me!
>>>
>>> 73, Pete N4ZR
>>> Check out the Reverse Beacon Network at
>>> http://reversebeacon.net,
>>> blog at reversebeacon.blogspot.com.
>>> For spots, please go to your favorite
>>> ARC V6 or VE7CC DX cluster node.
>>>
>>> On 2/25/2013 6:33 PM, VR2BrettGraham wrote:
>>>> Here is some more data.  On 2012-09-21, there were 151 RBN spots of the 
>>>> same call but on another frequency >3 kc away on the same band at 
>>>> exactly the same time (to the second) as another skimmer spot. For this 
>>>> query, I can avoid "dupes", so opening that up to spots of the same 
>>>> call >3 kc apart on the same band within about 9 seconds of each other 
>>>> finds 369.
>>>>
>>>> That is just one mechanism.  Spots of same call on different band on 
>>>> the very same second look to have been 140.  That's already 0.3% of RBN 
>>>> spots that day & that will exclude a LOT of wrong-band spots.  Add 
>>>> busted call spots & who-knows-how-many busted call wrong-band or 
>>>> wrong-freq spots & then scale all this up by some factor as activity is 
>>>> much higher on weekends (I'm working with weekday data here, as it 
>>>> makes it easier to find wrong-band spots as no multi-multis on then) - 
>>>> I believe RBN could be blowing 1-2% of what it spots, perhaps more.
>>>
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