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<p>frequency which is heard as a tone in the speaker. BFOs are also used to demodulate <a href="page.php?w=single-sideband_modulation">single-sideband</a> (SSB) signals, making them intelligible, by essentially restoring the <a href="page.php?w=carrier_wave">carrier</a> that was suppressed at the transmitter. BFOs are sometimes included in <a href="page.php?w=communications_receiver">communications receiver</a>s designed for <a href="page.php?w=short_wave">short wave</a> listeners; they are almost always found in communication receivers for <a href="page.php?w=amateur_radio">amateur radio</a>,</p><p>
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