Secondary Surveillance Radar

Question 1

What is IFF?

Answer 1

Identification Friend or Foe

Question 2

What is SSR?

Answer 2

SSR - Secondary Surveillance Radar

Question 3

What frequency does SSR transmit on?

Answer 3

1030hz to interrogating/ request

Question 4

What frequency does a ‘Transponder’ receive on?

Answer 4

1090mhz

Question 5

What do military aircraft use?

Answer 5

IFF

Modes 1 -5

Question 6

What do Civil aircraft use?

Answer 6

SSR

Modes A, B, C and S

Question 7

What 2 modes are the same with SSR and IFF?

Answer 7

IFF mode 3 + SSR mode A

3/A

Question 8

What are the SSR modes and what do they do?

Answer 8

Mode A - 4096 codes (ID)
Mode B - backup Mode A
Mode C - Altitude information
Mode S - 24bit aircraft address, commonly fitted to large aircrafts

Question 9

What are the IFF modes and what do they do?

Answer 9

Mode 1 - Platform function
Mode 2 - Platform ID (ship, aircraft etc)
Mode 3 - Same as Mode A (ID)
Mode 4 - Encrypted response 
Mode 5 - Encrypted data transfer

Question 10

What are the 3 conspicuity codes/squaks?

Answer 10

7700 EMERGENCY
7600 Radio failure
7500 unlawful interference

Question 11

What is TCAS?

Answer 11

Traffic Collision Avoidance System

Question 12

Does TCAS use IFF or SSR?

Answer 12

SSR

Question 13

What modes does TCAS use?

Answer 13

Mode S + C