Radar Flashcards
What does primary radar need in the aircraft
Nothing
What does secondary surveillance radar require in the aircraft (SSR)
Transponder in aircraft
What is the radar dish like for a secondary surveillance radar
Not a big dish as pulses are being send out and being returned
Why is there a difference in frequency from the transmitted frequency of a station and the transponder return for secondary surveillance radar
To avoid echos
What is transponder mode a
Squak
Just code
What is transponder mode C
Altitude = 1013 datum = in 100’s feet
What is transponder mode S
Data link
What determines the difference between transponder mode A and mode C signal
The distance between P1 and P3
Mode A = short = 8 microseconds
Mode C = long = 21 microseconds
What does P 2 do on the signal of a transponder
Eliminates side lobes
If proper lobe = P1 / P2 are bigger
What does a long P4 on a transponder signal mean
All data required for mode S
What does a short P4 on a transponder signal mean
Selective call for selected data from mode S
What is garbling
Signals from 2 or more aircraft merging
Aircraft close together
What is fruiting
Transponder responding to interrogation from another radar
Creates false echo on radar screen
What is 7700
Emergency squak
What is 7600
Radio failure squak
