Artemis: Radio Signals Recognition Manual
For those of you that are interested in all the strange and mysterious buzzing, beeps, and shrill tones of shortwave (as well as the VHF/UHF bands) identifying these signals can be difficult. However with the advent of SDR and more and more people dedicated to the identification and decoding of these types of signals it has recently got quite a bit easier.
Enter Artemis and Sigidwiki.com. These resources allow you to easier identify that strange signal that you are receiving on your shortwave receiver and even have links to software to help you decode it.
I have been a user of sigidwiki.com for quite some time now and love how there is a listing of these signals with a waterfall image and a sound file. Artemis takes this a step further by being an installed Windows application so that you can download the sigidwiki database and then keep it on your local computer. It has a dedicated interface and is quite a nice little program.
Artemis is software created by Dalla Tiezza Marco in cooporation with RTL-SDR.com forum.
When you open the software for the first time you will need to update the database files and then load them:
This is a really nice feature as it lets you know if the software and the database files are up to date. Don’t have internet and you are going to be on the go? Just update your laptop before you go and then listen away and you can identify those stations.
The interface has many different modes and explains where most likey there are found, the bandwidth of the type of signal being used, a spectrum waterfall photo, as well as a sound file that will play a sample sound.
Some of these signals listed are quite exotic and interesting. A link to Sigidwiki.com will take you to a web page (Wiki) where you can find out even more informaiton about a given signal.
I found this software and the wiki to be excellent and always have a lot of fun checking out these different signals on shortwave in particular.
This signal is quite interesting: CODAR (Coastal Ocean Dynamics Application Radar) and has been used since the early 1970s to measure and map near-surface ocean currents in coastal waters.
If you ever seem to hear something strange on your receiver you can even capture the audio and the spectrum and then upload it to sigidwiki.com and add a new signal to the list. New signals are being added all the time and it is interesting to see what changes from month to month.
You can download Project Artemis (currently version 1.0 Beta) from http://markslab.tk/project-artemis/ and you can check out sigidwiki.com at http://www.sigidwiki.com/wiki/Signal_Identification_Guide
I can’t wait to see what also becomes of project Artemis. I would love for them to add software decoders built in to the interface or perhaps at least links to the decoders in Artemis.
All in all, it is a very cool little program and I look forward to further development.
73! de Nick N9SJA
K9XN 
That’s a nifty little app. I can’t count how many times I’ve heard some type of digital transmission on the radio and had no clue what it was. Including the spectrum view is very handy to match up with a waterfall image. That codar image is neat-looking!