Discussion
Why is an antifading antenna used for medium wave broadcasting?
Answer: D
A mast about half a wavelength high or a little more concentrates radiation at low angles and puts a null in the direction that would return from the ionosphere nearby, so the fading zone is pushed beyond the intended service area. It is a pattern shaping solution to a propagation problem. Ground wave strength is set by the low angle radiation, uniform radiation would make matters worse, and no practical antenna switches polarisation in response to fading.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development