5 BASIC OPERATION5-13■ Dualwatch operationDualwatch operation simultaneously monitors two fre-quencies.The ID-51A/E has two independent receiver circuits asA band and B band.Depending on the operating band or mode, the SUBband audio signal is muted. In such case, “ ”appears.During the dualwatch operation, the audio output maybe interrupted when the frequency is switched whilescanning, or by other factors.D MAIN band selectionPush [MAIN]➥ to alternately select upper halfband or lower half band as the MAIN band.• “MAIN” appears on the MAIN band.• “Band selection, operating frequency input using [DIAL],operating mode selection, Memory channel selection,memory write and band scope function can be made onthe MAIN band.MAIN band is upper halfMAIN band is lower half❍ SUB band mute statusMAIN band SUB bandDV mode DV modeFM-N modeFM-N mode DV modeFM-N modeAIR band AIR bandA/B band selection in the DR modeThe DR mode screen can be displayed on the A band(upper) or B band (lower).When the DR mode is displayed on the A band, andthe DR mode is selected in the B band, the previouslydisplayed frequency or memory before entering theDR mode is displayed on the A band.• Display image for the DR modeDR mode screenA bandB bandA bandB bandAppears when the SUB bandaudio signal is muted.MAIN bandSUB bandExample: MAIN band is FM-N mode.SUB band is DV mode.
