Fusion is a digital communications mode for voice and data,
including pictures. It utilizes a customized, yet open, C4FM FDMA
stands for Continuous
Four Level Frequency Modulation, which is a
special type of 4FSK, which is used in conjunction with FDMA -
Division Multiple Access. FDMA is the same mode that is
in P25 Phase 1 by public service groups, including Emergency
Responders, but its not compatible.
What sets this new technology apart from other digital voice
technologies, such as D-STAR, DMR, P25, and NXDN, is its backwards
compatibility with analog FM.
Here's a look at bandwidths used by different analog and digital modes,
Automatic Mode Select
Every Fusion radio and repeater is aware of the current QSO and it's
mode, using a feature called Automatic Mode Select. This function instantly
recognizes whether the received signal is C4FM digital or conventional
FM. The communication mode automatically switches to match the received
mode. Even if a digital signal is being used, you can switch to FM
communication if radio signals are received from an FM station. This
function enables stress-free operation by removing the need to manually
switch the communication method each time.
AMS function breaks down into the
following operating modes that are fully selectable by the radio user:
AUTO: The both RX/ TX mode is
automatically selected from one of the four operating modes (DN, VW, DW
and FM) to match the characteristics of the received signal. This is
the current AMS operation.
MANUAL: The both RX/ TX mode is automatically selected
from four operating modes to match the characteristics of the received
signal. And if desired to change the TX mode, by pressing the
Microphone PTT switch momentarily, the TX mode switch between DN and FM
FM FIXED: The RX mode is automatically selected from one
of the four operating modes, but the TX mode is fixed to FM.
DN FIXED: The RX mode is automatically selected from one
of the four operating modes, but the TX mode is fixed to the ‘DN’
(Digital Voice Narrow) mode.
VW FIXED: The RX mode is automatically selected from one
of the four operating modes, but the TX mode is fixed to the ‘VW’
(Digital Voice Wide) mode.
System Fusion uses a similar
DVSI AMBE DSP
chip as used in DMR & P25, but newer than what's used in
Four Digital Modes
Narrow) – Voice+Digital or “V/D” mode
Voice FR (VW) Mode – Utilizes
all available bandwidth for high-fidelity voice operation, providing
the most crystal clear of voice communications.
Transfer data such as images or
text messages at full rate with speeds up to 9600 Bits-per-second
Analog FM Mode
compatibility with existing Analog FM Equipment, allowing a wide range
of users to experiment with System Fusion Digital.
Capabilities such as Automatic
Mode Select (AMS) on the DR-1X Repeater allow an even wider range of
users to communicate, by running the repeater in “Fixed FM” mode on
Transmit, and “Automatic Mode Select” on receive the repeater will
automatically detect the incoming signal and convert it to an Analog FM
Transmission. This mode allows digital users to communicate with
existing Analog FM users without the need to switch their radios into
FM Mode, allowing crystal clear Digital reception into the repeater
that is converted into a conventional FM Signal.
Auburn, Goff Hill
Poland Spring, White Oak Hill
Brunswick, Woodward Cove
North Conway, Mt. Cranmore
Kensington, Waymouth Hill
Gilford, Gunstock Mountain