Icom IC-FR5000 Series Sales Handbook page 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.
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. Accordingly, the FCC certified the F3061/4061 as the first ever 6.25 kHz radio.
The figure on the right is the emission mask for a 12.5 kHz channel. With a 12.5 kHz channel, you can create
two offset 6.25 kHz channels.
6.25 kHz channel 6.25 kHz channel 6.25 kHz channel 6.25 kHz channel
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.
12.5kHz Analog FM
NOTE: NOTE: The double capacity example shown above may not apply to some countries depending on local regulations.
NOTE: NOTE:
6.25 kHz FDMA Technology
12.5 kHz channel 12.5 kHz channel 12.5 kHz channel 12.5 kHz channel
6.25kHz FDMA
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