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Shortwave Data Decoding Discussions regarding decoding digital signals on the HF bands, including HFDL, ALE, RTTY, CW, and others.

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Old 02-12-2012, 12:42 PM
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Default Didn't expect this on the waterfall

Caught what appeared to be the image of a ham callsign on 40 mtrs last night. It made me wonder if it was from digital SSTV. I tuned to 14.233 this morning and sure enough, when these stations I.D.'d an image would appear on the waterfall.
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Old 02-12-2012, 1:42 PM
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Yep, cool stuff. Download and install Easypal and you'll be able to view the pictures being sent back and fourth. Here are some receptions from my SDR where you can see the software in action:

HAM Digital SSTV via DRM Reception with Perseus SDR & Easypal - YouTube
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Old 02-12-2012, 2:37 PM
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N7RKY must be in Australia ....... He's upsidedown....
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Old 02-12-2012, 2:52 PM
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As my curiosity grew I did install Easypal and played with that for a little while. I dont know why it shows up reverse image on the sdr wf but normal image on Easypal wf.
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Old 02-12-2012, 3:01 PM
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Quote:
Originally Posted by skidplate View Post
As my curiosity grew I did install Easypal and played with that for a little while. I dont know why it shows up reverse image on the sdr wf but normal image on Easypal wf.

Looks like it's designed for a waterfall moving top to bottom, vs. bottom to top.
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Old 02-12-2012, 6:03 PM
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That makes sense travisd.
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Old 02-12-2012, 10:04 PM
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Hellschreiber perhaps?

Hellschreiber - Wikipedia, the free encyclopedia
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Old 02-13-2012, 8:02 AM
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In Hellschreiber the characters are left to right like they are typed.

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Old 02-17-2012, 1:44 PM
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The waterfall of course 'falls' down the screen and scans left to right - therefore the first point that would be painted is the bottom left corner of the "N" on the screen then work its way along the bottom bits of all the characters, then do the second line from the bottom until finished. Therefore it prints upside down. The hellscreiber program is oriented the other way up so that it does print correctly.

Just like Travis said.
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Old 02-17-2012, 2:24 PM
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I don't know exactly how much it has in common with this instance. but this is an interesting write-up on some similar "hidden" images that have appeared in Music.
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