Bedienungsanleitung Garmin GTN 650 (Seite 79 von 412) (Englisch)

579857

Zoom out

Zoom in

Vorherige Seite

1/412

Nächste Seite

190-01007-A3 GTN 6XX/7XX AML STC Installation Manual

Rev. 4 Page 2-37

2.4.12 Audio Electrical Noise

Because the audio panel is a point in the aircraft where signals from many pieces of equipment are

brought together, take care to minimize effects from coupled interference and ground loops. Coupled

interference can creep into audio system interconnecting cables when they are routed near large AC

electric fields, AC voltage sources and pulse equipment (strobes, spark plugs, magnetos, EL displays,

CRTs, etc). Interference can also couple into audio system interconnecting cables by magnetic induction

when they are routed near large AC current-carrying conductors or switched DC equipment (heaters,

solenoids, fans, autopilot servos, etc).

Ground loops are created when there is more than one path in which return currents flow or when signal

returns share the same path as large currents from other equipment. These large currents create

differences in ground potential between the various equipment operating in the aircraft. These differences

in potential can produce an additive effect on audio panel input signals. The audio panel may “hear” the

desired input signal plus an unwanted component injected by ground differentials, a common cause of

alternator-related noise. This is the main reason why all audio jacks should be isolated from ground.

Terminating audio shields at one end eliminates a potential ground loop injection point. The audio shields

should only be grounded at one end to prevent ground loops. The wiring diagrams and accompanying

notes in this manual should be followed closely to minimize noise effect

2.4.13 Transmit interlock and Split COM Operation

In small aircraft, COM and NAV receiver interference is affected by both the distance between antennas

and the tuned frequency separation. With transmit interlock activated in the COM transceivers, split COM

operation between a flight crew of more than one pilot is affected.

In aircraft that have a transmit interlock feature, when either transmitter is keyed, all other receivers are

muted so that they won’t pick up interference from the active COM transmitter. This is the preferred

option for single pilot operation.

For aircraft with two flight crew members, transmit-interlock would likely interfere with communications.

When the pilot or the copilot transmit, no audio is heard on any other receiver. This means that if the pilot

is communicating with ATC while the copilot transmits on another radio, all pilot reception is cut off

during the time of copilot transmission.

If the installation does not have transmit-interlock activated, all the receivers are listening all the time

whether any radio is transmitting or not. Split COM performance varies significantly across installations.

If the transceivers interfere with each other, transmission by one radio produces static or squeal, thus loss

of communication from any other radio.

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Garmin GTN 650 Seite 79

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info