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
--------------------------------------------------
From: "Pete Smith N4ZR" <n4zr@contesting.com>
Sent: Tuesday, February 26, 2013 4:49 AM
To: <cq-contest@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@contesting.com>
To: <vr2bg@harts.org.hk>
Cc: <cq-contest@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.
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|