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RY (test signal)
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>An Introduction to Amateur Radioteletype p.10 Archived 2009-03-20 at the Wayback Machine <a href="http://www.hertzmail.com/rtty/ttyinfo1.pdf" target="_blank">http://www.hertzmail.com/rtty/ttyinfo1.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Digital Signal Types <a href="http://www.ominous-valve.com/digital.txt" target="_blank">http://www.ominous-valve.com/digital.txt</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>