5511 SET MODESDD Monitor key actionThe monitor key, [MONI], can be set as a ‘sticky’ key. Whenset to the sticky condition, each push of [MONI] toggles themonitor function ON and OFF.• PU (Push) : Pushing and holding [MONI] to monitor the fre-quency. (default)• HO (Hold) : Push [MONI] to monitor the frequency and pushagain to cancel it.DD Tuning speed accelerationThe tuning speed acceleration automatically speeds up thetuning speed when pushing and holding [YY] or [ZZ], or rotat-ing [VOL] rapidly.*• S–S.At : The tuning speed acceleration is activated. (de-fault)• S–S. m : The tuning speed acceleration is not activated.*When tuning dial is assigned with [VOL].DD Mic simple modeThis item turns the microphone simple mode ON and OFF.Microphone simple mode is used to change the function as-signments for keys in the optional HM-75A REMOTE CONTROLSPEAKER - MICROPHONE as below. This assignment is conve-nient for 3-channel use of simple operation.• mIC.n1 : Normal 1 (default)• mIC.n2 : Normal 2• mIC.Sm: Simple modeA 1750 Hz tone can be transmitted with the HM-75A opera-tion.➥ Push [A] while pushing [PTT].Optional HM-75A requiredHM-75A Mode NORMAL1 NORMAL2 SIMPLEkey[A] Freq. [CALL] [MONI] [MONI]CH Null[B] Freq. VFO/Memory VFO/Memory [CALL]CH Null Null[YY] Freq. Freq. Up Freq. Up MR-00CHCH Memory CH Up Memory CH Up[ZZ] Freq. Freq. Down Freq. Down MR-01CHCH Memory CH Down Memory CH Down