High speed CW and weighting changes. - QRQcw2024-03-28T11:01:22Zhttps://qrqcwnet.ning.com/forum/topics/high-speed-cw-and-weighting?commentId=1993813%3AComment%3A5690&x=1&feed=yes&xn_auth=noRESULTS ARE IN: 18 VOTES TOTA…tag:qrqcwnet.ning.com,2011-01-20:1993813:Comment:56902011-01-20T13:47:23.000ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p><strong><span>RESULTS ARE IN: 18 VOTES TOTAL</span></strong></p>
<div><p>FILE 1 = 50 % WEIGHT <strong> 2.8 to 1</strong> <em>dash/dot ratio</em> 5.5ms rise/fall time</p>
<p>FILE 2 = 50 % WEIGHT <strong>3.2 to 1</strong> <em>dash/dot ratio</em> 5.5ms rise/fall time</p>
<p>FILE 3 = <strong>38 %</strong> WEIGHT <strong>3.0 to 1</strong> <em>dash/dot ratio</em> 5.5ms rise/fall time</p>
<p>FILE 4 = 50 % WEIGHT <strong>3.0 to 1</strong> <em>dash/dot ratio</em> 5.5ms rise/fall…</p>
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<p><strong><span>RESULTS ARE IN: 18 VOTES TOTAL</span></strong></p>
<div><p>FILE 1 = 50 % WEIGHT <strong> 2.8 to 1</strong> <em>dash/dot ratio</em> 5.5ms rise/fall time</p>
<p>FILE 2 = 50 % WEIGHT <strong>3.2 to 1</strong> <em>dash/dot ratio</em> 5.5ms rise/fall time</p>
<p>FILE 3 = <strong>38 %</strong> WEIGHT <strong>3.0 to 1</strong> <em>dash/dot ratio</em> 5.5ms rise/fall time</p>
<p>FILE 4 = 50 % WEIGHT <strong>3.0 to 1</strong> <em>dash/dot ratio</em> 5.5ms rise/fall time</p>
<a href="http://storage.ning.com/topology/rest/1.0/file/get/3127148537?profile=original" target="_self"><img width="437" src="http://storage.ning.com/topology/rest/1.0/file/get/3127148537?profile=RESIZE_480x480" width="437" class="align-left"/></a></div>
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<p><strong> - Dash/dot ratio of 3.2 to 1 , ties with default dash/dot ratio of 3 to 1 -</strong></p>
<p><strong> - all files received a significant amount of votes -</strong></p>
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<p> </p> Here is a link to a short sli…tag:qrqcwnet.ning.com,2011-01-06:1993813:Comment:56752011-01-06T16:30:38.000ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Here is a link to a short slide show that demonstrates the SPECTRUM difference of varying the rise/fall time</p>
<p>from 4 ms to 10 ms while sending cw at 120 wpm. As you will observe, there is a continued improvement in the reduction of low frequency components and edge noise as you go from 4 ms up to 10 ms on Fldigi.</p>
<p><a href="https://docs.google.com/present/view?id=ddw2g8w8_160dfhs62cs&interval=1&autoStart=true&loop=true" target="_blank">SPECTRUM SLIDE SHOW</a></p>
<p>Here is a link to a short slide show that demonstrates the SPECTRUM difference of varying the rise/fall time</p>
<p>from 4 ms to 10 ms while sending cw at 120 wpm. As you will observe, there is a continued improvement in the reduction of low frequency components and edge noise as you go from 4 ms up to 10 ms on Fldigi.</p>
<p><a href="https://docs.google.com/present/view?id=ddw2g8w8_160dfhs62cs&interval=1&autoStart=true&loop=true" target="_blank">SPECTRUM SLIDE SHOW</a></p> One of the more interesting t…tag:qrqcwnet.ning.com,2011-01-06:1993813:Comment:56732011-01-06T15:05:53.000ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>One of the more interesting things I have noticed is that once the CW wpm starts getting over 100 wpm, there is a percussion effect that starts to increase on top of the actual cw note. Also a low bass guitar like thumping also starts to take effect. The lower in rise/fall time you go the more predominant these 2 "extra sounds" become and will actually start to power over the actual cw tone, and you will hear more percussion and bass thumping than actual cw elemental notes.</p>
<p>I have…</p>
<p>One of the more interesting things I have noticed is that once the CW wpm starts getting over 100 wpm, there is a percussion effect that starts to increase on top of the actual cw note. Also a low bass guitar like thumping also starts to take effect. The lower in rise/fall time you go the more predominant these 2 "extra sounds" become and will actually start to power over the actual cw tone, and you will hear more percussion and bass thumping than actual cw elemental notes.</p>
<p>I have found that for cw sent over 100 wpm, I prefer a much higher rise and fall time(my raised cosine edge preference is BLACKMAN waveform- between 8 to 10 ms on FLdigi) </p>
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<p><strong>Here is an example of the spectral purity of a file sent at 120 wpm on FLdigi at 10ms ( ~ 830 hertz )</strong></p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127147982?profile=original"><img class="align-center" width="698" src="http://storage.ning.com/topology/rest/1.0/file/get/3127147982?profile=original"/></a></p>
<p><strong>Here is a spectrograph of 120 wpm speed with the only difference being the rise/fall time is 5 milliseconds</strong></p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127150550?profile=original"><img class="align-center" width="698" src="http://storage.ning.com/topology/rest/1.0/file/get/3127150550?profile=original"/></a>As you can see, there are low bass notes starting to get through ~30 & 70 hertz which are very audible using modern headphones... Also getting through are various lower freq "percussive frequencies" that are also very audible...There is a balance between the percussive effects, bass thumping effects, rise/fall time and cw pitch that come together and make adjusting all these cw timing parameters well worth the effort for best cw purity, sound, clarity and best all around settings for optimum, maximum copy and comprehension. </p> Rick, I thought of an experim…tag:qrqcwnet.ning.com,2011-01-06:1993813:Comment:56702011-01-06T14:22:50.000ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Rick, I thought of an experiment that we might try and develop a consensus as you say.</p>
<p>Here is what I suggest to test for best settings on all the cw timing preferences at ones maximum qrq copy speed.</p>
<p>1. Download <a href="http://www.w1hkj.com/download.html" target="_blank">FLdigi</a> <strong>NOTE:</strong> <em>FLdigi is the only qrq cw sending program that will allow you to adjust every</em></p>
<p><em> parameter of CW timing from which type of RAISED COSINE waveform you…</em></p>
<p>Rick, I thought of an experiment that we might try and develop a consensus as you say.</p>
<p>Here is what I suggest to test for best settings on all the cw timing preferences at ones maximum qrq copy speed.</p>
<p>1. Download <a href="http://www.w1hkj.com/download.html" target="_blank">FLdigi</a> <strong>NOTE:</strong> <em>FLdigi is the only qrq cw sending program that will allow you to adjust every</em></p>
<p><em> parameter of CW timing from which type of RAISED COSINE waveform you prefer to incremental changes</em></p>
<p><em> in RISE and FALL TIME as well as weight and dash/dot ratio. At extreme qrq levels, a small change in</em></p>
<p><em> a CW timing option may offer a big improvement in qrq cw copy and the audible beauty of the cw note ! </em></p>
<p>2. load a text file to send at ~1 to 2 wpm above your absolute max qrq cw copy speed: (<strong>RT CLICK</strong> on the blue screen and follow prompt) [<strong>NOTE</strong>: <em>it is much easier to discern an increase in copy ability if you send just above your max while adjusting the timing parameters to see if any combination of timing options helps you copy better etc....</em>]</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127147891?profile=original" target="_self"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127147891?profile=original" width="645" class="align-center"/></a>3. Click on the <strong>Tx</strong> button or the <strong>T/R</strong> button and start sending the file. Then click on the TOP MENU TABS, CLICK ON <strong>CONFIGURE</strong>.. then CLICK ON <strong>MODEMS</strong> to bring up the options for FLdigi select the tabs as you see here:</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127150755?profile=original" target="_self"><img width="645" src="http://storage.ning.com/topology/rest/1.0/file/get/3127150755?profile=RESIZE_1024x1024" width="645" class="align-center"/></a>While this file is being transmitted by FLdigi to your soundcard, use your headphones for best copy and </p>
<p>then adjust the FLdigi timing settings to see which combination of <strong>weight</strong>,</p>
<p><strong>EDGE SHAPE</strong>(HANNING or BLACKMAN) <strong> DASH/DOT</strong> ratio and <strong>EDGE TIMING</strong>(rise and fall time in milliseconds) sounds best to you... and let everyone that would like to participate in this experiment report their final results here in the comments section...</p> Hi Rick,
Excellent question a…tag:qrqcwnet.ning.com,2011-01-01:1993813:Comment:56312011-01-01T17:14:54.000ZChuck aa0hwhttps://qrqcwnet.ning.com/profile/chase
<p>Hi Rick,</p>
<p>Excellent question and I just put up on the front page of our website a new TESTING POLL and 4 CW mp3 files sending just a short phrase from w4bqf's article, "<span style="font-family: Verdana, Helvetica, Arial, sans-serif; color: #1c2023; line-height: 18px;">QRQ or Copying CW over 70 wpm"</span> I varied the weight and dot/dash ratio on each file slightly while sending CW at 75wpm. Let's take a survey and see which mp3 CW file everyone thinks is their choice for best…</p>
<p>Hi Rick,</p>
<p>Excellent question and I just put up on the front page of our website a new TESTING POLL and 4 CW mp3 files sending just a short phrase from w4bqf's article, "<span style="font-family: Verdana, Helvetica, Arial, sans-serif; color: #1c2023; line-height: 18px;">QRQ or Copying CW over 70 wpm"</span> I varied the weight and dot/dash ratio on each file slightly while sending CW at 75wpm. Let's take a survey and see which mp3 CW file everyone thinks is their choice for best sounding cw at that speed. I will give the details<em>(which one has what weight and dot/dash ratio etc)</em> of the files once there are enough poll results to be statistically significant. The files were made with FLdigi and AUDACITY.</p>
<p>Thanks Rick</p>
<p>Chuck</p>