210 RADIO WAVE PROPAGATION EXPERIMENTS 
By substituting from equations (8) and (10), equa- and hence, 
tion (4) assumes the form Ma = a ener 
M,= Ado , —ani(r + a7/2) 
_ 7 _ Apo HPT +(@hAT/2T*) 
For all practical cases, Ti 7 
AT Even at heights as’great as 10* m it can be seen that 
sa K1 ; 
27 the second of these exponentials can be replaced by the 
Tas.e 3E. H fort from 10 C (50 F) to 20 C (68 F); h to 2,000 m (6,562 ft). 
po = 1,000 mb at sea level 
h(m) 10 11 12 13 14 15 16 17 18 19 20 Vien 
0.0 
{ 0 279.2 278.2 277.2 276.2 275.3 274.3 273.4 272.4 271.5 270.5 269.6 
10 278.9 277.9 276.9 275.9 274.9 274.0 273.1 272.1 271.2 270.2 269.3 32.8 
20 278.5 277.5 276.6 275.6 274.6 273.7 272.8 271.8 270.9 269.9 269.0 65.6 
30 278.2 277.2 276.2 275.2 274.3 273.3 272.4 271.5 270.5 269.6 268.7 98.4 
40 277.8 276.8 275.9 274.9 274.0 273.0 272.1 271.2 270.2 269.3 268.4 131.2 
50 277.5 276.5 275.6 274.6 273.7 272.7 271.8 270.9 269.9 269.0 268.1 164.0 
75 276.7 PALL 274.8 273.8 272.8 271.9 271.0 270.1 269.1 268.2 267.3 248.1 
100 275.8 274.9 273.9 273.0 272.0 271.1 270.2 269.3 268.3 267.4 266.5 328:1 
150 274.2 273.3 272.3 271.4 270.4 269.5 268.6 267.7 266.8 265.9 265.0 492.1 
200 272.5 271.6 270.7 269.7 268.8 267.9 267.0 266.1 265.2 264.3 263.4 656.2 
250 270:9 270.0 269.1 268,1 267.2 266.3 265.4 264.5 263.7 262.8 261.9 820.2 
300 269.2 268.3 267.4 266.5 265.6 264.7 263.8 262.9 262.1 261.2 260.3 984.3 
350 267.6 266.7 265.8 264.9 264.0 263.1 262.2 261.4 260.5 259.7 - 258.8 1,148.0 
400 266.0 265.1 264.2 263.4 262.5 261.6 260.7 259.9 259.0 258.2 257.3 1,312.0 
450 264.4 263.5 262.6 261.8 260.9 260.0 259.2 258.3 257.5 256.6 255.8 1,476.0 
500 262.8 261.9 261.1 260.2 259.4 258.5 257.7 256.9 256.0 255.2 254.4 1,640.0 
600 259.6 258.8 258.0 257.1 256.3 255.5 254.7 253.9 253.0 252.2 251.4 1,969.0 
700 256.5 255.7 254.9 254.0 253.2 252.4 251.6 250.8 250.1 249.3 248.5 2,297.0 
800 253.4 252.6 251.8 251.1 250.3 249.5 248.7 247.9 247.2 246.4 245.6 2,625.0 
900 250.4 249.6 248.8 248.1 247.3 246.5 245.8 245.0 244.3 243.5 242.8 2,953.0 
1,000 247.4 246.6 245.9 245.1 244.4 243.6 242.9 242.1 241.4 240.6 239.9 3,281.0 
1,500 232.9 232.2 231.6 230.9 230.3 229.6 228.9 228.3 227.6 227.0 226.3 4,921.0 
2,000 219.3 218.7 218.1 217.6 217.0 216.4 215.8 215.2 214.7 214.1 213.5 6,562.0 
On ree on 
50.0 51.8 53.6 55.4 57.2 59.0 60.8 62.6 64.4 66.2 68.0 N\A (ft) 
tFN\ 
Tasie 3F. H for ¢ from 20 C (68 F) to 30 C (86 F); h to 2,000 m (6,562 ft). 
po = 1,000 mb at sea level 
tc— 
h(m)\,__ 20 21 22 23 24 25 26 27 28 29 30 i 
I) 0 269.6 268.7 267.8 266.9 266.0 265.1 264.2 263.3 262.5 261.6 260.7 0.0 
10 269.3 268.4 267.5 266.6 265.7 264.8 263.9 263.0 262.2 261.3 260.4 32.8 
20 269.0 268.1 267.2 266.3 265.4 264.5 263.6 262.7 261.9 261.0 260.1 65.6 
30 268.7 267.8 266.9 266.0 265.1 264.2 263.3 262.5 261.6 260.8 259.9 98.4 
40 | 2684 267.5 2666 265.7 2648 263.9 263.0 2622 2613 260.5 259.6 131.2 
50 268.1 267.2 266.3 265.4 264.5 263.6 262.7 261.9 261.0 260.2 259.3 164.0 
75 267.3 266.4 265.5 264.7 263.8 - 262.9 262.0 261.2 260.3 259.5 258.6 248.1 
100 | 266.5 265.6 264.7 263.9 263.0 2621 2612 2604 2595 258.7 257.8 328.1 
150 265.0 264.1 263.2 262.4 261.5 260.6 259.7 258.9 258.0 257.2 256.3 492.1 
200 263.4 262.5 261.7 260.8 260.0 259.1 258.3 257.4 256.6 255.7 254.9 656.2 
250 261.9 261.0 260.2 259.3 258.5 257.6 256.8 256.0 255.1 254.3 253.5 820.2 
300 260.3 259.5 258.6 257.8 256.9 256.1. 255.3 254.5 253.6 252.8 252.0 984.3 
350 258.8 258.0 257.2 256.3 255.5 254.7 253.9 253.1 252.2 251.4 250.6 1,148.0 
400 257.3 256.5 255.7 254.8 254.0 253.2 252.4 251.6 250.8 250.0 249.2 1,312.0 
450 255.8 255.0 254.2 253.4 252.6 251.8 251.0 250.2 249.4 248.6 247.8 1,476.0 
500 254.4 253.6 252.8 251.9 251.1 250.3 249.5 248.7 248.0 247.2 246.4 1,640.0 
600 251.4 250.6 249.8 249.1 248.3 247.5 246.7 246.0 245.2 244.5 243.7 1,969.0 
700 248.5 247.7 247.0 246.2 245.5 244.7 243.9 243.2 242.4 241.7 240.9 2,297.0 
800 245.6 244.9 244.1 243.4 242.6 241.9 241.2 240.5 239.7 239.0 238.3 2,625.0 
900 242.8 242.1 241.3 240.6 239.8 239.1 238.4 237.7 237.0 236.3 235.6 2,953.0 
1,000 239.9 239.2 238.5 237.8 237.1 236.4 235.7 235.0 234.3 233.6 232.9 3,281.0 
1,500° 226.3 225.7 225.1 224.4 223.8 223.2 222.6 222.0 221.4 220.8 220.2 4,921.0 
2,000 213.5 213.0 212.4 211.9 211.3 210.8 210.3 209.7 209.2 208.6 208.1 6,562.0 
86.0 87.8 89.6 91.4 93.2 95.0 96.8 98.6 100.4 102.2 104.0 ee 
iF 
