Progress Test 3 Flashcards
(48 cards)
Aircraft radios can be different, what functions do all radios have?
Name four functions.
On/Off
Volume
Squelch
Frequency selection
What is Squelch?
When adjusting a radio receiver so that it is silent unless a signal of a certain strength is received.
Most aircraft have a factory set squelch, how can this be overrided?
By pushing or pulling the knob. Most modern radios have an adjustable squelch via the set up menu.
What can be done so that distant stations or intermittent ones can be heard?
Pull out the on/off volume knob.
What is the term used to describe hearing your own voice whilst transmitting.
Side tone
How does frequency selection in the Garmin integrated COM/NAV work?
The frequency selector controls both COM and NAV frequencies, can select either function from another by pressing down on the C/V knob.
How is a radio set normally installed if there are multiple?
COM’s are usually numbered from top downwards in the avionics equipment stack.
How can you test that the volume is set correctly?
Briefly pulling out or pressing the volume knob to disable the squelch (to hear background noise)
On the readability scale what does 1-3 mean and what should not happen when this is the case?
1 = Unreadable
2 = Readable now and then
3 = Readable but with difficulty
A flight should not be flown with these readability scores.
What does 4 and 5 mean on the readability scale?
4 = Readable
5= Perfectly readable
What must be included when asking for a radio check?
Must include the Frequency of the station and it’s ATSU name.
What does an intercom system allow for?
Communication between the pilot, co-pilot and passengers with headsets.
What is a drawback of the intercom system?
Can become a distraction with passenger chatter which can lead to radio calls being missed.
Knowing how to use the intercom system can make a flight less stressful, what does a simple intercom have?
On/Off, volume and intercom squelch.
When turning on the intercom system, the squelch should be set to a minimum and volume should be set. How can you adjust the squelch and volume properly?
Name 3 parts of the process
With no speaking, adjust the squelch until ambient noise stops.
Speak into the microphone to ensure the squelch is broken when you talk.
This process may need to be repeated due to increase ambient noise (Engine noise)
What is VOX?
Voice Operated Transmission/Exchange is the system that allows a person to transmit over the intercom when a sound is detected. Using the Squelch this can be adjusted so only voices are detected.
When is an audio panel (complex intercom) used in an aircraft?
When there are multiple COM/NAV radios, often have separate volume and squelch controls for the pilot and co-pilots. An Audio panel can be functionally split into listen and speak areas of the panel
True or False? Using the audio panel (complex intercom) you can listen and transmit on two frequencies at once.
False. You can only listen to two frequencies at once, you can only transmit on one.
True or False? Some installations allow a split so that the pilot can transmit and receive on COM1 and the co-pilot can do the same on COM2.
True. This can be done at the same time.
How can the intercom system allow the pilot to listen to the radio and not listen to the passengers (passengers can still communicate with each other)?
By pressing a button on the intercom the pilot can isolate themselves from the passenger chatter, this can be done for the pilot and the co-pilot as well.
What does the AUTO position do on the intercom system?
This selects the appropriate ‘listen’ COM purely by selecting the required ‘speak’ setting.
What two types of noise cancelling headsets are there?
Passive and active noise reduction - the more noise reduction the better
True or False? The microphone position is more optimum when placed at a close distance to the mouth.
True.
What is the PTT switch?
Push To Talk.
