6.25 kHz FDMA Technology
10
Because the emission mask is tight, 6.25 kHz channels can be used next to each other without causing
interference. The bandwidth measurements below show the 6.25kHz FDMA signal meets the FCC
designated emission mask requirements. (For reference only)
NOTE: The double capacity example shown above may not be applicable in some countries depending on
local regulations.
Range
Audio quality over distance is also greatly improved
with Icom’s 6.25 kHz technology. Instead of the early
degradation of audio that you see in an analog signal,
the 6.25 kHz digital audio quality remains higher over
a comparable distance.
6.25kHz FDMA12.5kHz Analog FM
6.25 kHz FDMA makes twice the number of channels available within the same spectrum as shown below.
This is a real solution to meet expanding demand for spectrum every year.
6.25kHz channel 12.5kHz channel
The IDAS system doubles the capacity of the current 12.5kHz channel allocation to meet any narrow
bandling requirements.
The figure on the left is the emission mask for a 6.25 kHz channel. The Icom 6.25kHz FDMA signal clearly
operates within the mask.
Span 25.0kHz Span 50.0kHz
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