Chapter II.
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Chap. II, art. 2 RR)(81) Type of Modulation Type of Transmission Supplementary Characteristics Symbol Telegraphy without the use of modulating audio frequency — P1 Telegraphy by the keying of a modulating audio frequency or audio frequencies, or by the keying of the modulated pulse (special case: an unkeyed modulated pulse) Audio frequency or audio frequencies modulating the pulse in amplitude P2d Audio frequency or audio frequencies modulating the width of the pulse P2e Audio frequency or audio frequencies modulating the phase (or position) of the pulse P2f Telephony Amplitude modulated P3d Width modulated P3e Phase (or position) modulated P3f Composite transmissions and cases not covered by the above P9 Section II.
Bandwidth 81 § 6. Wherever the full designation of an emission is necessary, the symbol for that class of emission, as given 63 Stat. 1606 (82–84)(
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