9TAKEOFF TOUR190-00356-00 Rev GSelecting COM and VLOC FrequenciesWhile the 400W-series unit is acquiring a position,let’s take a minute to dial in the active and standbyfrequencies you’ll be using for the first phase of yourflight. The 400W-series display is divided into separate“windows” (or screen areas), including a COM window,VLOC window, and the GPS window.COM Window:Active Frequency COM Window:Standby Frequencywith tuning cursorVLOC Window:Active FrequencyPushing the small left knob activates the tuningcursor in the desired frequency window. To select theactive frequency, you must first enter the frequencyin the standby field, and use the COM flip-flop (orVLOC flip-flop) key to move it to the active field.To change the standby communication (COM) orVLOC frequency:1. If the tuning cursor is not currently in thedesired window (COM or VLOC), press thesmall left knob momentarily to switch thehighlight between the COM and VLOC win-dows. Adjusting the frequencies with the largeand small left knobs will affect the standbyfrequency.2. Turn the large left knob to select the desiredmegahertz (MHz) value. For example, the“135” portion of the frequency “135.325”.3. Turn the small left knob to select the desiredkilohertz (kHz) value. For example, the “.325”portion of the frequency “135.325”.4. To activate the selected frequency, press theappropriate flip-flop key—COM for commu-nication frequencies or VLOC for VOR/Localizerfrequencies.Once you’ve entered the active frequency, simplyrepeat steps 1 through 3, above, to enter the standbyfrequency. After both communication frequencies havebeen entered, you may elect to keep the COM window‘hot’ by leaving the cursor on the standby frequency, ormove the cursor to the VLOC window by pressing thesmall left knob.Once you’ve entered the active frequency, simplyrepeat steps 1 to 3, above, to enter the standby fre-quency. After both communication frequencies havebeen entered, you may elect to keep the COM window“hot” by leaving the cursor on the standby frequency,or move the cursor to the VLOC window by pressingthe small left knob.NOTE: When selecting VLOC frequencies, thetuning cursor automatically returns to the COMwindow after 30 seconds of inactivity.NOTE: GPS level of service annunciations (LPV,ENR, etc. as shown on page 83) are not appli-cable to the external CDI (or HSI) when VLOC isactive.These features are only available in the 420W/430Wunits.Selecting COM and VLOC Frequencies420W / 430W Only
