6.25 kHz FDMA Technology
Future Applications for 6.25kHz Technology
Future Applications for 6.25kHz Technology
Future Applications for 6.25kHz Technology
Future Applications for 6.25kHz Technology
This new digital land mobile technology can be a platform for future integration of IT/IP/VOIP technologies. To this
end, there are some initiatives between a number of manufacturers to promote 6.25kHz technology more widely.
VHF Considerations*
VHF Considerations*
VHF Considerations*
VHF Considerations*
The VHF narrowband plan is 7.5 kHz channels, which
has eliminated the geographical separation
requirement. Tests have proven the Icom 6.25 kHz
signal can be used within a 7.5 kHz channel with no
interference to the adjacent channel.
Split a 25 kHz or 12.5 kHz Channel
Split a 25 kHz or 12.5 kHz Channel
Split a 25 kHz or 12.5 kHz Channel
Split a 25 kHz or 12.5 kHz Channel
This is similar to the UHF application. With a 12.5 or
25 kHz channel, you can create two or four offset 6.25
kHz channels. This may require a waiver from the FCC.
One 25 kHz Channel to Three 6.25 kHz Channels
One 25 kHz Channel to Three 6.25 kHz Channels
One 25 kHz Channel to Three 6.25 kHz Channels
One 25 kHz Channel to Three 6.25 kHz Channels
A single 25 kHz channel can be converted to three
6.25 kHz channels, each operating within a 7.5 kHz
channel.
* Some of the content above applies to the U.S.A. only.
VHF offers even more opportunities due to its original
30 kHz channel width plan. When the FCC moved to
25 kHz and then 12.5 kHz an overlap was created
requiring geographical separation between two
contiguous channels. For example, 3 contiguous could
not be used at the same location.
12
This new digital land mobile technology can be a platform for future integration of IT/IP/VOIP technologies. To this
end, there are some initiatives between a number of manufacturers to promote 6.25kHz technology more widely.
An example is the formation of the dPMR MoU in Europe, and the FCC in the U.S.A. has recently proposed that
system owners consider switching to 6.25kHz technology where possible. Japan and China are also considering
6.25kHz for future digital radio standards.
The above is system is an image only.
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