TRANSMISSION EXPERIMENTS 29 
= SS 
SSS SS 
as ae oa 
OB BELOW | WATT 
- HIGH AND STEADY 
= AUGUST 6, 1944 
NEAR STANDARD AND STEADY = 
> AUGUST 11, 1944 
———— ——= = 
eee 
= See ae = 
= NEAR STANDARD WITH FAST VARIATIONS = 
. AUGUST 8, 1944 
OB BELOW | WATT 
= NEAR STANDARD WITH SLOW VARIATIONS : 
AUGUST 31, 1944 
LOW AND VARIABLE 
AUGUST 18, 1944 
Ficure 4. Signal types at 256 cm (117 mc per sec), Massachusetts Bay. 
signal became more common and substandard signal 
less frequent especially in the S band. This is shown 
in Table 2. 
These statistical results are characteristic of the 
over-water path near a coast used in the experiments 
of the Radiation Laboratory; and, while the signal 
types shown in Figures 3 and 4 are about the same 
in overland paths, the relative frequency of incidence, 
for the various types is quite different. This frequency 
depends not only on the location of the path but, 
also as shown above, on the season. A more detailed 
analysis shows that it also depends on the particular 
weather situation, which may prevail for periods of 
several days or longer. 
It has been mentioned before that the signal . 
patterns on the S and X bands and those on the 
