Garmin GNC 420W Pilots Guide - Page 30
Selecting a COM frequency, Making the standby frequency the active, frequency, COM Flip-flop
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SECTION 2 COM While receiving a station, an 'RX' indication (Figure 2-1) appears in the upper right corner of the COM Window to the immediate right of 'COM'. A 'TX' indication appears at this location when transmitting (Figure 2-2). 'TX' Transmit Indication 2) Turn the small left knob to select the desired kilohertz (kHz) value. For example, the '.325' portion of the frequency '135.325'. NOTE: The active frequency cannot be accessed directly, only the standby frequency is highlighted by the tuning cursor. Making the standby frequency the active frequency: Press the COM Flip-flop Key (Figure 2-4). Figure 2-2 'TX' Transmit Indication Selecting a COM frequency: 1) Turn the large left knob to select the desired megahertz (MHz) value (Figure 2-3). For example, the '135' portion of the frequency '135.325'. Figure 2-4 Active Frequency of 135.325 Figure 2-3 Standby Frequency of 135.325 2-2 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. K