Radio Basics and Equipment Flashcards
Hierarchy of high frequencies?
High
Very High
Ultra High
Super High
Extra High
What is the highest bracket of frequencies?
Extra High (EHF)
What is the second highest bracket of frequencies?
Super High (SHF)
Extra and Super High Frequencies operate with what unit of frequency?
Giga-hertz
What is the VHF’s bracket of frequencies?
30 - 300 MHz
What is the protected range of frequencies for aviation?
118.000 to 136.975 MHz
What term is given to the range of VHF and other associated frequencies?
Line of sight
What two faactors prohibit/restrict VHF etc?
Curvature and terrain
Line of sight formula?
1.23 x Square Root of Altitude Difference
Most tower and approach frequencies have what lateral range?
25nm
Tower frequency ranges?
25nm
4000ft
Approach frequency ranges?
25nm
10,000ft
What term describes the range of frequencies published in the AIP?
Designated Operational Coverage
What does DOC stand for?
Designated Operational Coverage
Designated Operational Coverage can be found where?
AIP
What weather factor affects DOC?
Tropospheric ducting
Tropospheric ducting increases frequency ranges typically during what weather?
Anticyclonic (causing temperature inversions)
Basics of tropospheric ducting?
Colder denser air on the ground slows waves down
Warmer less dense air above (caused by high pressure) means wave curves downwards in terms of range
ILS frequencies operate in what bracket?
108.000 to 111.975 MHz
VOR frequencies operate in what bracket?
112.000 to 117.975 MHz
What operates in 108.000 to 111.975 MHz?
ILS
What operates in 112.000 to 117.975 MHz?
VOR
On a volume knob, how is squelch usually turned off?
By pulling the knob out
Pulling a volme knob outwards typically does what?
Turns the squelch off
What is side-tone?
Hearing your own voice during transmission
Hearing your own voice during transmission is given what term?
Side-tone
What numbers on the readability scale are acceptable?
4 and 5
When conducting a radio check, what must be included?
The frequency and ATSU name
The frequency and ATSU name should be transmttted when performing what?
A radio check
What is VOX?
Voice-operated transmit
Voice-operated transmit is known as what?
VOX
When should squelch be set to minimum?
When setting up the radio
When setting up the radio, what should be done on the radio pane;?
Squelch should be set to a minimum
What is the most basic kind of radar?
Primary Surveillance Radar (PSR)
What frequency does an SSR operate at?
UHF
What sends a UHF signal in an SSR system?
The transponder
A transponder willl only transmit a squawk in what mode?
Mode Alpha
Mode Alpha means a transponder will only transmit what by UHF?
The squawk code
AIP ENR recommends that Mode C should be downgraded to Mode A when the transponder and altimeter indicate a difference of what?
200ft
If your transponder altitude difference is greater than 200ft and you can’t downgrade to Mode A, what would you normally be advised to do?
Squawk 0000 to indicate transponder malfunction
What is the aerobatic conspicuity code?
7004
What does squawk code 7004 represent?
Aerobatic conspicuity code
