Flying at 16K feet, level, antenna elevation centered (or almost). Data says it's slightly down
Test Findings
1. 1 bar is bugged. TDC at any distance always shows zero difference between top and bottom number. (15/15 etc)
2. Bar height at 5 miles is always 10 degrees
3. Bar height for 2 bar gets smaller 10-160 nm, 5.5-3.5 degrees. Use it, but realize this.
4. Bar height for 4 and 6 bar at 10-160 nm is 5 degrees.
Conclusion
Use 4 and 6 bar, 10 - 160 nm for most consistent radar performance.
Data
Bar height = ATAN(H/RANGE)/BARS
2BAR
RANGE TDC_TOP TDC_BOT +H -H BAR_HT
160 34 -4 18 20 3.5
80 25 6 9 10 3.5
40 20 11 4 5 3.5
20 18 13 2 3 4.3
10 17 15 1 2 5.5
05 18 14 2 2 10
Bar height decreases with range?
4 Bar
RANGE TDC_TOP TDC_BOT +H -H BAR_HT
160 73 -43 57 59 5
80 44 -14 28 30 5
40 30 1 14 15 5
20 23 9 7 7 5
10 19 12 3 4 5.5
05 22 10 6 6 10
6 Bar
RANGE TDC_TOP TDC_BOT +H -H BAR_HT
160 99 -82 83 98 5 (+H truncated at 99)
80 64 -33 48 49 5
40 40 -9 24 25 5
20 28 4 12 12 5
10 22 10 6 6 5
05 26 6 10 10 10