6.25 kHz FDMA Technology
With a 12.5 kHz channel, you can create two offset 6.25
kHz channels.
2
22
2----for
for
for
for----1
11
1
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
Both 2-for-1 and 4-for-1 efficiencies may be realized by
splitting existing channels. Using 6.25 kHz channels
offset from the center of a 25 kHz channel, it is possible
to fit four 6.25 kHz channels into the 25 kHz bandwidth.
To do this, a waiver from the FCC is required*. Using this
scheme, the four frequencies are now offset 3.125 kHz
from the original 25 kHz channel center frequency.
4
44
4----for
for
for
for----1
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1
U
U
U
UHF Considerations*
HF Considerations*
HF Considerations*
HF Considerations*
A number of frequency allocation options for 6.25 kHz
are available in UHF.
Note:
Note:
Note:
Note: the following options illustrate potential spectrum
opportunities with 6.25 kHz technology. Actual
opportunities may vary by locale and other conditions.
Please check with your frequency coordinator for
opportunities available in your location.
Obtain New 6.25 kHz Frequencies
Obtain New 6.25 kHz Frequencies
Obtain New 6.25 kHz Frequencies
Obtain New 6.25 kHz Frequencies
This may be the best option for a new radio user in a
location where no channels are available. Each 6.25 kHz
frequency is unique. Existing 25 kHz or 12.5 kHz
channels do not have to be “split.” This gives the
greatest flexibility to the frequency coordinator.
New
New
11
2
22
2----for
for
for
for----1
11
1
Expand an Existing System
Expand an Existing System
Expand an Existing System
Expand an Existing System
Spectrum holders can apply for some new additional
6.25 kHz channels and combine them with their
current 25 or 12.5 kHz channels. New frequencies
could occupy the existing 25 kHz or 12.5 kHz
bandwidth. Additional stand-alone 6.25 kHz channels
could also be used.
Channel 1
Channel 2
Channel 3
Hedge Strategy
Hedge Strategy
Hedge Strategy
Hedge Strategy
If you start at the center frequency, you can license 5
each 6.25 kHz frequencies underlying a 25 kHz channel.
The 2 outer frequencies are out of the 25 kHz channel
width. This provides license holders with a “hedge”
against losing that spectrum in 2013 when they will be
forced to 12.5 kHz.
* Some of the content above applies to the U.S.A. only.
*Note: No waiver needed if a 12.5 kHz channel is
exclusive (FB8), under part [90.173(j)]
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