Heli-Coder 4 Transmitter Operation Manual | Doc. No. 6051452100 Rev. C
Broadcast Microwave Services, Inc.
30
The following table summarizes the results of the 4 possible guard interval values:
Guard Interval
Ratio
Guard Interval
Duration (us)
Maximum echoes
dispersion (km)
Maximum transmission
distance (km)
1/32
7
2.1
2-6
1/16
14
4.2
4-12
1/8
28
8.4
8-24
1/4
56
16.8
16-48
Transmission distances can be increased when using directional antennas, but signal break-ups can still
occur if long echoes enter the receiving antenna beam width.
END
