The Radio Stack (General Questions)

Hi.

First of all, you should understand that all of the buttons on the radio stack are for audio signals that give morse code identifiers so you know you are tuned to the correct frequency. So there is no need to press the NAV1 button to intercept the ILS. as long as it is tuned into the NAV1 radio, it will function just fine.

So, the ADF button, just gives an audio morse id so you know you are tuned to the correct NDB.

The MKR button, when activated gives audio "warnings" when you are overhead the Outer, middle and Inner markers on an ILS approach.

The DME button will sound the same morse id as tuned into the Nav1 and Nav2 radios. If there is no morse, then the DME is not functioning or the VOR station does not have a DME readout.

Hope this helps
Will

An NDB or non directional Beacon is a ground based, low frequency radio transmitter used as an instument approch for airports and offshore platforms.  the NDB transmits and omni-diretional signal that is recieved by the ADF or automatic direction finder, a standard instument onboard aircraft.  The pilot uses the ADF to detrmine the direction to the NDB relative to the aircraft.  To navigate using the ADF, the pilot enters the frequency of the NDB and the compas card on the ADF will indicate the heading to the station.
The signal is transmitted on uninterrupted 24/7 basis..  .An audible Morse Code call sigh of one or more letters or numbers is used to identify the NDB being recieved.