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<p>(FCC) requirements for amateur radio station identification. Using AX.25, it is possible for any packet station to act as a <a href="page.php?w=digipeater">digipeater</a>, linking distant stations with each other through <a href="page.php?w=ad_hoc_network">ad hoc network</a>s. This makes packet radio especially useful for emergency communications.</p>

<p><big>History</big></p>
<p>Earlier digital radio communications modes were <a href="page.php?w=telegraphy">telegraphy</a> (using <a href="page.php?w=Morse_code">Morse code</a>), <a href="page.php?w=teleprinter">teleprinter</a></p><p>
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