Pete...
1st, thanks for all the Qs!
2nd: Are the Oxxxx calls coming from the same source (DE spotter/skimmer)
or all over the place?
de Doug KR2Q
On Sun, Sep 5, 2021 at 2:56 PM Pete Smith <pete.n4zr@gmail.com> wrote:
> Interesting hypothesis about speed. I only looked back 100 spots,
> beginning at 0020Z on September 4. I can't discern any pattern, though, as
> to speed or signal strength. Steve was sending consistently >30 wpm.
> Pretty much the same goes for one other "ONxxx" that turned up a lot during
> the CWO. Signal strength of the busts was all over the map, though Steve's
> are as consistently strong as you might expect.
>
> I used the callsign search feature of the RBN's web site to look for
> "*N2IC", which returned the last 100 spots spots for his call and for the
> ON variant. There were only 3 ON spots out of the last 100. For the other
> similar callsign, there were 9 out of 100 ON2 busts of his N2 call.
>
> Looking at the data, I'm inclined to believe that the "solution" is for
> users of RBN spots to make use of the "blacklist callsign" feature
> available in N1MM's Available Mults and Qs window. I don't know (yet)
> whether blacklisting a spot there by right-clicking on it will also cause
> it not to appear in the Bandmap window, but I suspect so.
>
> The second case, where Skimserv thinks you're done sending the callsign
> and drops the last letter, may be different. One station (a 1x2 call)
> either had his last letter dropped or changed from "P" to "I" 20 times in
> his last 100 spots. That suggests that the inter-letter space may be being
> misinterpreted as an inter-word space rather than an inter-letter space.
> In his case, speed was 28-30 wpm. I'm hopeful of hearing from him whether
> he was sending his call by hand, because it seemed by ear as if he was
> leaving a slightly longer space before the "I", perhaps for emphasis. If
> not, then we may have another case where blacklisting the busted versions
> of calls may be the only solution.
>
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at <http://beta.reversebeacon.net> <http://beta.reversebeacon.net>.
> For spots, please use your favorite
> "retail" DX cluster.
>
> On 9/5/2021 1:30 PM, Michael Adams wrote:
>
> [Distribution trimmed; groups I'm not subscribed to removed.]
>
> I just grep'd through the logs from my cluster node. You were mostly spotted
> correctly, with a few stray ON2IC's and a couple of N2TC's and N2ICE's in the
> mix, so I'd say that it's a demonstration of the challenges of automating
> copying code in an HF environment.
>
> One thing I did pick up on was that the error rate increased as your speed
> increased. The skimmer spots showed you mostly running around 34 wpm, but
> you did pick up the pace a couple of times to 36-38wpm, and when you did, you
> were more frequently mis-copied.
>
> Perhaps an argument could be made that those who like to run faster than
> 30-34 wpm might be well-served to throw an extra half-space around their
> calls.
>
> Another argument could be made that folks who use skimmer spots need to tweak
> their filters to remove some of the busted spots. I'm a firm believer that
> optimizing one's spot filters is key to success (or at least maximizing fun)
> when operating assisted.
>
> I didn't notice too many busted spots yesterday (I wasn't very active in CWO,
> but I do keep SpotCollector running pretty much all the time) because of my
> filtering...but my filters do allow uncertain calls from uncommon entities
> through. Belgium, the Czech Republic, and Denmark (ON, OK, OW) aren't
> uncommon, but I do frequently get alerts for Congo and Corsica (TN, TK) on
> Wednesdays during the CWTs.
>
> (I also have my node set to reject spots for about 25 busted calls ending in
> "CWT" generated by some CWT regulars whom the skimmers have trouble
> discerning the final space in "CQ call CWT" transmissions. I don't think
> they're necessarily doing anything "wrong"; it's just a constraint on the
> technology involved; an annoyance that a tweak on my end avoids.)
>
>
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