1–60. 1–61. 1–62. 1–63. 1–64. 1-65. What type of decoders do TACAN transponders  use? 1. Twin–pulse 2. Single–pulse 3. Neutral–pulse 4. Basic–pulse Which  of  the  following  receiver controls  provides  noise–generated output? 1. Fidelity 2. Sensitivity 3. Cycle 4. Squitter If  more  interrogating  aircraft  come into the TACAN’S range, the number of  noise–generated  pulses  will 1. increase 2. decrease What  signal  does  the  TACAN  ground station  transmit  to  identify itself? 1. Identification  pulse  group 2. Voice  pulse  group 3. Triangulation  pulse  group 4. Burst  pulse  group What  characteristic  of  the transmitted  TACAN  pulses  supplies the  distance  information  to aircraft? 1. Amplitude 2. Frequency 3. Timing 4. Gain What type of modulation is used to convey  TACAN  bearing  information? 1. Frequency 2. Pulse 3. Continuous  wave 4. Amplitude  modulation 6 1-66. 1-67. 1-68. 1-69. 1-70. 1–71. What type of radiation pattern is transmitted  by  the  TACAN  ground station  antenna? 1. Parabolic 2. Cardioid 3. Vectorial 4. Tangential What is the common name of the 135–Hz  reference  burst? 1. Composite  burst 2. North  reference  burst 3. Auxillary  reference  burst 4. East  reference  burst How  often  is  the  identification code  broadcast? 1. Every 37.5 seconds 2. Every 60 seconds 3. Every 37.5 minutes 4. Every 60 minutes What  is  the  designation  of  latest TACAN  equipment  in  the  fleet? 1. AN/URN–25 2. AN/URN-20 3. AN/URN-15 4. AN/URN–10 In  the  AS–3240  electronically– scanned antenna,    the old single- phase  rotating  parasitic  element has been replaced by how many electronically–switched   inner parasitic  elements? 1. 6 2. 12 3. 24 4. 32 What is one big advantage the electronically–scanned  antenna  has over  the  old  mechanically–rotated antenna? 1. It  eliminates  bandwidth limitations 2. It is cheaper to build 3. It is easier to troubleshoot 4. It  eliminates  propagation effects