May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone?
Yes, the entire signal will be inside the SSB allocation for Extra class operators
Yes, the displayed frequency is within the 75-meter phone band segment
No, the sideband components will extend beyond the edge of the phone band segment✓Bonne réponse
No, US stations are not permitted to use phone emissions below 3.610 MHz
Explication
Phone privileges on 75 meters begin at 3.600 MHz for every class that has them, and a lower-sideband signal with a 3.601 MHz carrier reaches down to about 3.598 MHz, inside the 80-meter segment where only CW, RTTY and data are authorized. The displayed carrier frequency being inside the phone segment is not the test, because the whole emission has to fit; phone below 3.600 MHz is barred by the emission rules rather than by a 3.610 MHz boundary.