How many permanent echoes are permitted by the advanced signal data processor (ASDP)?

How many permanent echoes are permitted by the advanced signal data processor (ASDP)?

• A. 15
• B. 20
• C. 25
• D. 30

Answer: (C)

Permanent echoes are fixed radar returns from terrain and man-made features that show up in every scan. The advanced signal data processor builds a permanent-echo table so these stationary reflections can be suppressed from weather returns, keeping the display clear of ground clutter. The system is designed to hold up to twenty-five permanent echoes in that table. When the table is full, new entries may replace older ones to maintain the limit, ensuring memory usage stays manageable while still filtering the common fixed clutter. Therefore, twenty-five is the correct limit.

Permanent echoes are fixed radar returns from terrain and man-made features that show up in every scan. The advanced signal data processor builds a permanent-echo table so these stationary reflections can be suppressed from weather returns, keeping the display clear of ground clutter. The system is designed to hold up to twenty-five permanent echoes in that table. When the table is full, new entries may replace older ones to maintain the limit, ensuring memory usage stays manageable while still filtering the common fixed clutter. Therefore, twenty-five is the correct limit.