 Do you hear that sound? That weird signal that sounds sort of like a fish farting, sort of like the Chevy when it wouldn't start. What the heck is that! They crop up all over the shortwave spectrum. No sooner do we categorize and name them (not decode them, oh, no, not a chance) than an entire new bunch rears up.They sometimes seem to outnumber the recognizable digital signals.
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If you know of these
systems, or have mysteries of your own to be listed, please
contact
me.
| Click on the frequency for the analysis page | Frequency | General Description |  | FSK, 125 Baud, 380 shift (apparently not ARS-ARQ) |  | 200 Baud FSK, in 3 channel widely spaced FDM |  | Sounds like a high speed fax, but what is it really? |  | MFSK, 4 tone, aggregate baud rate 195.5. |  | 2400 Baud PSK, Phase plane image, and others |  | Buzzing Sound, Probably a new type of HF modem. |  | Sliding tone (similar to fax signals). |  | The FACE OF ELVIS embedded in a phase modulated signal!! | |
The
Hoka Code30 was used to perform analysis and receive these signals.
Information is available at Hoka,
and at Computer Aided
Technologies.
Information on most digital signals can be found in the Digital Signals FAQ. |
 Luca
Barbi, the president of the Italian Hoka dealership, has an
interesting site offering analysis of standard RTTY modes. The
descriptions are in Italian, but the images and data are easily
understood by anyone who speaks "RTTY." |
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