NOMOGRAPHIC SOLUTIONS FOR THE STANDARD CASE 61 
a IN FEET 
S IN THOUSANDS OF YARDS 
ba} 
+6 
4 EXAMPLE SHOWN BY DASHED LINE 
$=220 
ce C=+10 
H=10,000 
: 
20000 
15000 
12500 
TS00 
§000 
2500 
Figure 6 
Here db stands for the number of decibels that the 
power density is below standard, where we. have 
assumed a power of 1 w for the transmitter. The 
symbol db is defined differently by the MIT group. 
The correspondence is: 
db <—> — [dbmrr + 49] . 
The value of X, which depends only on db and hy, 
was obtained from the nomogram of Figure 4 and 
equals 13.9. The product hif,,, is, of course, 300,000. 
The rest of the table was filled out by the methods 
Just described. 
The lobes corresponding to this data were also 
computed by the MIT method and are shown 
plotted in dotted lines in Figure 8. In general, these 
lobes agree completely with our own. In the cases 
where there is some slight variance, we have also 
drawn our lobes in heavy lines. Note that the MIT 
db of 95 corresponds to our db of 46. The nomograms 
presented herein correspond to a reflection coefficient 
of —1. For any other value they would have to be 
redrawn. 
