Garmin GMA 340 설치 매뉴얼 - 페이지 24

{카테고리_이름} Garmin GMA 340에 대한 설치 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Garmin GMA 340 43 페이지. Audio panel
Garmin GMA 340에 대해서도 마찬가지입니다: 파일럿 매뉴얼 (12 페이지), 추가 운영 매뉴얼 (10 페이지), 파일럿 매뉴얼 (4 페이지), 파일럿 매뉴얼 (8 페이지), 파일럿 매뉴얼 (8 페이지), 파일럿 매뉴얼 (12 페이지)

13. Transceiver Audio Selector Buttons (COM 1, COM 2, COM 3)

14. Transmitter (Audio/Mic) Selection Buttons

15. Split COM Button (SPKR in Dual ADF)

16. Aircraft Radio Audio Selection Buttons (NAV1, NAV2, DME, ADF)

17. Annunciator Test Button

18. Locking Screw Access

19. Photocell – Automatic Annunciator Dimming

3.1.2

On, Off, and Failsafe Operation

The GMA 340 is powered off when the left small knob (figure 3-1, item 5) is rotated fully CCW into the detent.

To turn the unit on rotate the knob clockwise past the click. The knob then functions as the pilot's ICS volume

control. A failsafe circuit connects the pilot's headset and microphone directly to COM 1 in case the power is

interrupted or the unit is turned off. Refer to the note in paragraph 2.6.2.

3.1.3

The intensity of the button annunciators and marker beacon LEDs are controlled automatically by a built-in

photocell (19) on the front panel. Nomenclature backlighting is controlled by the aircraft dimmer bus. See

installation wiring diagrams in Appendix B for guidance on connecting the dimmer bus to the GMA 340.

3.1.4

Audio level is controlled by the selected com radio volume control.

Selection of either COM 1, COM 2, or COM 3 (13) for both MIC and audio source is accomplished by pressing

either COM 1 MIC, COM 2 MIC, or COM 3 MIC (14). The active com audio is always heard on the headphones.

Each audio source can be selected independently by pressing COM 1, COM 2, or COM 3 (13). When selected in

this way, they remain active as audio sources independently of which transceiver has been selected as the active

microphone source.

When a microphone is keyed, the active transceiver's MIC button LED blinks approximately once per second to

indicate the transmitter is active.

When no aircraft radio activity is detected by the GMA 340, the amount of ambient background noise from the

radios is further reduced by the MASQ

3.1.7). If this feature is not desired, then J1 pin 16 (MASQ INH*) should be tied to ground.

Page 3-2

Rev. L

NOTE

circuit. This processing is also applied to the Nav radios (described in

GMA 340 Installation Manual

190-00149-01