Discussion
Why is the highest frequency performance of a large antenna often checked at night?
Answer: D
Solar heating distorts the surface and the support structure by amounts comparable to the tolerance at millimetre wavelengths, so the surface is at its best in thermal equilibrium after dark. Water vapour does often fall at night, which helps too, but the deformation argument is the one specific to the antenna itself. Interference and receiver temperature are separate considerations. When a measurement is scheduled to avoid an effect, identifying which effect is being avoided explains the rest of the practice.
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