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Reference.org
QSA and QRK radio signal reports
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<p>The QSA code and QRK code are interrelated and complementary signal reporting codes for use in wireless telegraphy (<a href="/facts/Morse_code/GXwCl1HV">Morse code</a>). An enhanced format, <a href="/facts/SINPO_code/pXMjYGq0">SINPO code</a>, was published in the ITU Radio Regulations, Geneva, 1959, but is longer and unwieldy for use in the fast pace of Morse code communications. </p>