Radio Principles & Radar (PSR,SSR,AWR) Flashcards
Electric and Magnetic field components of the electromagnetic wave are at what angle to each other?
Right Angles
With regard to Attenuation, the smoother the surface the wave travels over the (higher, less) the attenuation.
What is the correct answer?
Less
Define Cycle
One complete rotation through all of the values of magnitude and direction of the oscillation (one complete wave)
The most suitable frequency range for Sky Waves is?
**MF and HF
(when higher than HF the radio waves pass through the ionosphere and continue into space)**
The transponder reply light on the the control panel will remain solid (stay on) under what conditions?
When TST (test) function is on or when using the IDENT button
Describe the function of the tilt control on a typical airborne weather radar
Tilt control determines the angle between the beam and the horizon, it is manually tilited in flight up or down (adjust the beam in its vertical plane)
Polarisation is the plane in which the ____ component of the radio wave oscillates
**Electrical **component
State the optimum HF frequencies to use by day and night
At night; lower end of the HF around 3MHz (below 10MHz)
At Day; higher end of the HF band around 30MHz
The transponder code for Radio Failure is?
7600
Wavelength and Frequency are **(inversely, directly) **proportional.
What is the correct answer?
**Inversely **Proportional
PSR radar operates in which frequency bands?
UHF and/or SHF
When the transponder is in SBY mode, it (will, will not) respond to interrogation
What is the correct answer?
Will Not
typical airborne weather radar does not detect… (list three)
Clouds
Fog
Wind-shear
Wind
Clear Air Turbulence
Lightning
Mode A only information will be available when (ON, SBY, ALT, TST) is selected on the transponder control panel
What is the correct answer?
ON
Electromagnetic waves/radiation consist of ____ and ____ fields
consist of **Electric **and **Magnetic **fields
A limit of Mode C information is that it provides pressure altitude to the nearest (10ft,100ft,150ft,50ft)
What is the correct answer?
**100ft
(note: it supplies 1013hPa pressure altitude, which is converted to AMSL by ATC displays/equipment if required)**
Typical airborne weather radar operates on what frequency and what band on the electromagnetic spectrum?
Around 9.4GHz and in the X band microwave spectrum
List two disadvantages of AM over FM
**Requires higher power
Vulnerable to interference causing static**
Sky Wave reception is (improved, degraded) at night
What is the correct answer?
**Improved **at night
When ALT mode is selected on the transponder control panel, the transponder is supplying (Mode C, Mode A) information.
What is the correct answer?
Mode C (Mode A + Altitude)
7500 transponder code is used in what event?
Hijack/Unlawful Interference
Where are Radio Waves positioned on the electromagnetic spectrum?
Lowest end of the spectrum (from Radio up to Gamma)
The frequency of the carrier wave and modulated wave are kept constant but the amplitude of the the carrier wave is varied.
This is describing (AM, FM), What is the correct answer?
AM
One limitation of Mode A or C transponders is that only ____ transponder codes are available for use
4096
Describe Direct Waves
Associated with VHF and higher frequencies, they travel in straight lines and do not bend around obstacles or bend in the ionosphere
State the three emergency transponder codes
7500, 7600, 7700
With regard to airborne weather radar, the ANT STAB switch provides what function?
It enables or disables the automatic antenna stabilisation
The (higher, lower) the frequency the greater the abiliity for the waves to follow the surface
What is the correct answer?
Lower
With regard to airborne weather radar, GAIN control is usually set to what mode?
CAL/AUTO
Define Wavelength
The physical distance between one part of a cycle and the identical part of the following cycle