Garmin GMA 340 Instrukcja instalacji - Strona 28

Przeglądaj online lub pobierz pdf Instrukcja instalacji dla Wyświetlacz awioniki Garmin GMA 340. Garmin GMA 340 43 stron. Audio panel
Również dla Garmin GMA 340: Podręcznik pilota (12 strony), Dodatkowa instrukcja obsługi (10 strony), Podręcznik pilota (4 strony), Podręcznik pilota (8 strony), Podręcznik pilota (8 strony), Podręcznik pilota (12 strony)

3.1.13 Marker Beacon Receiver

The marker beacon is part of an ILS system, and in certain instances, used to identify an airway. In addition to

the normal marker beacon functions, the GMA 340 provides an audio muting function. The LEDs illuminate, and

an associated keyed-tone is heard (when MKR audio is selected), when the aircraft passes over a 75 MHz marker

beacon transmitter.

The lights and audio keying for ILS approach operation are summarized below.

Audio

Frequency

400 Hz

1300 Hz

3000 Hz

The marker beacon audio level is aligned at the factory to produce its rated audio output. However, the output

level is adjustable through an access hole in the top cover of the unit (see figure 2-3).

The GMA 340's marker beacon receiver controls are located on the left side of the front panel [(1) through (4)].

The SENS button (4) selects either high or low sensitivity as indicated by the HI or LO LED being lit. Low

sensitivity is used on ILS approaches while high sensitivity allows operation over airway markers or to get an

earlier indication of nearing the outer marker during an approach.

The marker audio is selected initially by pressing the MKR/mute button (2). If no marker beacon signal is

received, then pressing again will deselect the marker audio. This operation is similar to selecting any other audio

source on the GMA 340. However, if the second button press occurs while a marker beacon signal is received,

then the marker audio is muted but not deselected. The button's LED will remain lit to indicate that the source is

still selected.

The GMA 340's SmartMute

when the current marker signal is no longer being received.

In all cases, the marker beacon LEDs operate independently of any audio selection and cannot be turned off. The

GMA 340 can drive external marker lamps if required. Maximum source current is 125 mA (8 Vdc max).

Page 3-6

Rev. L

Audio Keying

function then monitors the marker signal and automatically unmutes the audio

LED Actuated

Blue (Outer)

Amber (Middle)

White (Airway/Inner)

GMA 340 Installation Manual

190-00149-01