All voltages measured here are peak voltages

------------------------------------------------------
Attenuation over Frequency
Input Amplitude (40kHz Scope): 16Vac,peak
Distance between sensors: 0.6m
Transmitter angle: horizontal orientation of pins
Receiver angle: vertival orientation of pins

Maximum amplitude at 40.4kHz

Frequency  Voltage
35.0kHz    3.75mV
35.5kHz    5.00mV
36.0kHz    8.00mV
36.5kHz   12.00mV
37.0kHz   20.00mV
37.5kHz   33.50mV
38.0kHz   55.00mV
38.5kHz  110.00mV
39.0kHz  205.00mV
39.5kHz  310.00mV
39.75kHz 380.00mV
40.0kHz  440.00mV
40.25kHz 530.00mV
40.5kHz  510.00mV
40.75kHz 480.00mV
41.0kHz  330.00mV
41.25kHz 220.00mV
41.5kHz  165.00mV
42.0kHz   84.00mV
42.5kHz   45.00mv
43.0kHz   27.50mV
43.5kHz   16.50mV
44.0kHz    9.75mV
44.5kHz    7.25mV
45.0kHz    5.75mV



-------------------------------------------------------
Attenuation over angle
Frequency: 40.4kHz
Input Amplitude (40kHz Scope): 16Vac,peak = 11.3Vac,rms
Distance between sensors: 0.6m
Transmitter angle: horizontal orientation of pins
Receiver angle: vertival orientation of pins

Angle   Voltage
00°     570mV
05°     560mV
10°     540mV
15°     500mV
20°     430mV
25°     390mV
30°     320mV
35°     265mV
40°     190mV
45°     145mV
50°     100mV
55°      73mV
60°      55mV
65°      49mV
70°      45mV
75°      47mV
80°      47mV
85°      42mV
90°      43mV


-------------------------------------------------------
Attenuation over distance
Frequency: 40.4kHz
Input Amplitude (40kHz Scope): 16Vac,peak = 11.3Vac,rms
Transmitter angle: horizontal orientation of pins
Receiver angle: vertival orientation of pins

Distance  Voltage
0.3m   1150mV
0.4m    900mV
0.5m    700mV
0.6m    580mV
0.7m    500mV
0.8m    420mV
0.9m    370mV
1.0m    330mV
1.1m    300mV
1.2m    275mV
1.3m    225mV
1.4m    250mV
1.5m    200mV
1.6m    200mV
1.7m    110mV
1.8m    165mV