<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;American_Morse_code" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;American_Morse_code</a> says that &#x27;o&#x27; was encoded as &#x27;dit &lt;space&gt; dit&#x27;, whereas &#x27;i&#x27; was encoded as &#x27;dit dit&#x27;. International Morse Code changes &#x27;o&#x27; to be &#x27;dah dah dah&#x27;. I cannot see any evidence American Morse was used for radio, though it may have been.