You've heard MS pings, of course. But what does a HSCW ping sound like? Can it really be as short as some claim and still be usable? Try these first few examples.

Play buttonHear a typical HSCW ping, 0.16 sec long (8 k wave file).

Or, hear it as an MP3 file.
(Slowed down 40 times it says "73 73 73 7". The first 2 are slightly garbled).

Play buttonNow - hear a 0.065 second ping at 8000 lpm (1600 wpm) on KOØU (now KØXP).

Play buttonOr, slow it down 100 times (KOØU slow).

See the GIF file of the 0.065 sec ping (24 K gif file).

Play buttonHear W4WHN, EL96, as received by W1LP/MM, EK30, in the Pacific Ocean. (0.8 sec, 36 K wave file, so slow download; 6000 lpm; only a portion of the overdense burst presented here. Easy QSO).
In MP3 format, 15 K.

QSB on MS signal If you've operated much during the big showers, you've heard the extreme flutter-type QSB (rapid variation of strength) on some of the bursts, especially overdense bursts. It's hard to realize how much flutter some of the pings have until they are viewed on the screen and expanded. Here's a 15 second High Speed CW meteor scatter signal, visualized with Cool Edit. (Click on picture for enlargement - 108K).
Play button Hear the 16 sec ping. NOTE: 162 K - will take a long time to download.

Or, hear it as an MP3 file (30K).

Several pings (both underdense and overdense) with a little Doppler shift on them. (Caused by the reflection of the signal from the head of the train, which is moving rapidly due to the velocity of the meteor).
Play button 4K, underdense ping.

Play button 34K, overdense burst.

Or, hear it as an MP3 file (19K).

Play button 10K, ping.

Or, hear it as an MP3 file (6K).

The previous section was primarily to show you a little about High Speed CW and meteor scatter signals. The following section is a collection of pings for actually testing MSDSP.

Don't bother to download any of the following pings unless you have MSDSP (or an equivalent program or device) ready for testing. You will not be able to do anything useful with them!


Because of the length of some of these files, many will be very slow to download. It is suggested that you select what you need for your immediate tests and download only a few at a time.
To save a ping: Right-click on the name of the file, then "Save Link as...." Store file in the proper directory.
After downloading the pings (be sure you know into which directory they are being downloaded - or save them directly into the WinMSDSP/WAV subdirectory), move the pings into the WAV subdirectory under WinMSDSP, if you haven't already done so. If you are using some other device or program, save and store them properly.
For WinMSDSP, start the program. Click on the first small buffer. Then click on File/Open, choose the wave file you want, and double-click on that file. It will be copied into the small buffer. If you wish to open a second file now, click on the next empty small buffer, copy the next file into that buffer, etc.
Then click on the small buffer of the file you want to examine. The signal will appear in the main buffer's window. Try playing it back slowly (for 6000 lpm, try a -060x slowdown first, then adjust from there). You will want a playback tone of about 425 Hz at first. Then adjust from there.
Some of the files have a tiny ping embedded in the white noise on both sides of it, instead of being edited down as is usually done with saved pings. This is to enable you to hear a very short, weak ping as it might actually be received. Some of these pings can be read, some cannot.
To hear the ping as it sounds in real time, disable the slowdown and also disable the tone. Left-click on the small box to the right of the respective slider, changing the + to a -. (If you have a 3-button mouse, move the pointer into the large buffer's window and click the center button to toggle both the speed and tone. A 3-button mouse is highly recommended for use with WinMSDSP).
Now experiment with different settings - see what you can do with the ping.
Note that these are not necessarily "good" pings. Some are unusable, being too short and/or too weak to copy anything. But they are very good for practice, to learn how to handle the program, and to know just what can and cannot be done!

Even the tiny pings here are OK, but you can't see a weak ping that you have saved? Increase your Pixel Density. (See the "Problems" paper for help. It's available from the MSDSP page).
These pings sound good, but when you save a ping it doesn't sound like that? Increase your Sample Rate, or try turning the playback tone off. (See the "Problems" paper for help and explanations).
You can't copy what is supposed to be in some of these pings? Play each one several times. Experiment with the speed and tone (see above). Add an audio filter between the output of the computer and your headphones. Try "hi-fi" headfones, even cheap ones. And practice!

REMEMBER - the following files will be useless without WinMSDSP or equivalent.
All of the following are at 6000 lpm and were recorded with a sample rate of 44100 unless noted.
0904ES.WAV 1.6 sec, 69K. A short overdense burst.
0904ES2.WAV 0.274 sec, 12K. Just the ping. Quite usable.
0904ES4.WAV 0.176 sec, 8K. Just the ping. Very weak, readable.
NG2.WAV 2 sec, 88K. Ping 0.11 sec. Very weak, not usable. Can be heard.
NG3.WAV 0.45 sec, 20K. Ping 0.01 sec. One character can be copied.
NG4.WAV 2.16 sec, 93K. Ping .08 sec. To see what a tiny, almost-usable ping sounds like in real time. Practice playing it back at full speed.
0904M1.WAV 2.8 sec, 122 K. 2 pings, 0.09 and 0.83 sec. Static crash at beginning of file. First ping short, about 4 characters.
0904M2.WAV 1.1 sec, 47K. Ping 0.08 sec, medium strength, complete calls.
0904M3.WAV 3.1 sec, 134K. 2 pings, 0.67 and 0.186 sec, medium strength.
09904M4.WAV 2.0 sec, 88K. Ping 0.53 sec, lots of information.
0904M5.WAV 1.6 sec, 70K. 2 pings, 0.1 sec and very tiny.

The next two files are to show the difference between using different Sample Rates, etc.
For use, it is suggested that both files be downloaded and then placed into two of the MSDSP buffers.
Play back both pings, both in normal speed and with a -055x or so slowdown (transmission speed is 6000 lpm). When slowed down, try a playback tone of about 425 Hz (or your preference).
Then disable the playback tone (click on the small box, changing the + to a -). Note the difference between sample rates!
(Very few people actually use a sample rate of 11025. Some use 22050, while many use 44100).
(See the "Problems" paper for more information on the settings).
0904TXB.WAV 1.48 sec, 64K. Ping 0.14 sec. Good strength, typical underdense "ping" shape. 44100 sample rate.
0904TX2.WAV 1.48 sec, 12K. Ping 0.14 sec. Same as 0904txb, but 11025 sample rate. See and hear the difference.

Many of the other HSCW Web sites also have sample pings.

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Go to (a href="hscw.html"> HSCW Home Page (if you have not been there previously this time).