Icom IC-756PRO Datasheet
HF/50 MHz ALL MODE TRANSCEIVER
RELAYING THE REAL MEANING OF PLEASURE INTO THE AMATEUR RADIO WORLD. MATERIALIZING TECHNIQUES NOT PREVIOUSLY ACHEIVABLE, THE IC-756PRO AND ICOM WILL TAKE YOU, YOUR TRANSCEIVER
AND OPERATING CAPABILITIES INTO A NEW POWER PERFORMING DIMENSION. BECOMING THE BEST
OF THE BEST, THE IC-756PRO STANDS SECOND TO NONE. AN HF/50 MHz, ALL MODE TRANSCEIVER,
MADE PERFECT FOR THOSE SERIOUS HAMS. FULL OF REVOLUTIONARY FUNCTIONS DESIGNED TO GIVE
YOU AN ADVANTAGE, AND BACKED BY PERFORMANCE THAT WILL KEEP YOUR COMPETITION ON
THEIR TOES. ICOM TECHNOLOGY, STARTING A
NEW DIMENSION.
HF/50 MHz ALL MODE TRANSCEIVER
THE DIGITAL REVOLUTION
JUST TOOK A HUGE LEAP
FORWARD
It began with developing
the ultimate in IF-DSP
HF transceivers with DSP are being introduced one after the other. Icom has taken
the lead over other transceivers by not
just using existing DSP, but in an effort to
create the pinnacle in this technology, has
developed an all new, original DSPunit.
Equipping the 32-bit Floating Point
DSP— first in amateur equipment
The 32-bit Floating Point DSP— this DSP
provides a much wider and precise processing ability than 16-bit Fixed Point
DSP, did with previous DSP transceivers.
And also, the built-in 24-bit AD/DA converter helps to realize
ultra wide dynamic range
operation. The result is,
this unique Icom technology has made it possible
to realize unparalleled
performance, deservedly
fitting of the name ‘PRO’.
T aking the potential of the transceiver
to heights unimaginable, until now.
The combination of the 32-bit Floating
Point DSP and 24-bit AD/DA converter is
loaded with superior digital functions never
before available with previous DSP units.
With the DSP controlled AGC loop management, it is now possible to achieve
pure digital functions. The digital IF filter,
digital twin PBT and manual notch, the
elimination of radio interference, unrivaled
transmission and reception S/N, ultra-low
distortion transmission and reception tone
quality etc., is delivered. The search by
Icom for the ultimate HF transceiver, resulted in the 32-bit Floating Point DSP and
24-bit AD/DA converter,
and brought to life in the
IC-756PRO. The most
striking impression of the
ability of this technology
is without a doubt, the
performance of the digital
IF filter.
For the efficient operation of
all functions.
In particular, people on the DX or contest
front lines demand instant response. So,
Icom has incorporated a 5-inch TFT color
LCD in the IC-756PRO. The LCD, with
superior visibility and various types of information clearly defined, has been designed to lessen the burden of the
operator, while increasing accuracy and
ease of understanding.
We completely redesigned the whole
transmitter and receiver.
The IC-756PRO was designed to be the
‘Ultimate HF Transceiver’. It is possible to
upgrade and make a better machine from
the previous IC-756. But it is even better
still, to completely rethink and redesign, and
in the process, create revolutionary
progress in technology. It was this revolutionary thinking that lead to the creation and
realization of the ultimate in everything a
DSP machine should be, the ‘IC-756PRO’.
■ 32-bit floating point DSP
To dramatically increase the ability of all
digital functions in this all mode transceiver, the latest technology has been
used and a newly designed DSP has
been created. The IC-756PRO, has employed an originally designed 32-bit floating point DSP unit. Along with this, sees
the adoption of the 24-bit AD/DA converter making a formidable team with
ample capacity. Especially with the receive signal input, the AD/DA converter
provides ultra wide dynamic range, 144
dB*, of signal management. Clear signals
without any distortion are realized even in
any signal conditions, such as very weak
or extremely strong signals from nearby
stations. The DSP has extremely high
performance processing ability, which dramatically improves signal resolution, as
well as both transmission and reception
S/N ratio, and allows more high performance features and properties.
*theoretical value at digital operation stage.
■ AGC loop management
The digital IF filter, manual notch filter etc.
are adopted in the AGC loop, and controlled by the 32-bit floating point DSP.
This system removes blocking by extremely strong adjacent signals in out of
filter passbands. Therefore, you will never
have to suffer blocking of the AGC again.
The result is that even very weak signals
can be extracted from the noise level in
between crowded strong signals clearly!
In addition, the AGC time constant,
(three
presettable slow, medium and fast) are flexi-
bly adjustable for each operating mode to
suit operating band conditions, operating
style, etc.
■ RF speech compressor
The IC-756PRO has truly drawn the line
between previous models and their standard equipped compressors. The 32-bit
capacity provided from the DSP, allows
the speech compressor to compress the
transmitter IF signal, therefore, average
talk power is increased. This function of
course is effective for long distance communication, or when propagation conditions are poor. IC-756PRO keeps the
level of distortion to it’s lowest extremity at
maximum compression. In turn this ensures that your fellow ham enthusiasts
are presented with quality readability. In
addition, the transmit bandwidth is selectable, regardless of the speech compressor activity, from 2.2, 2.4 and 2.8 kHz to
suit operating band conditions, etc.
■ Twin peak audio filter
Atwin peak audio filter has been built in. 2
specified audio frequencies only are
passed through the filter in the DSP for
accurately receiving an RTTY signal, for a
profound decoding rate. You will see a
dramatic improvement in the quality of
S/N, as well as removing interfering CW
signals, etc.
■ Edge cutting IF filter
The IC-756PRO is equipped with a digital IF filter that can be set from a total of 51
passband widths. Unacheived with previous analog filters, the IC-756PRO fields an
outstanding inclusion with it’s shape factor. Sharply cutting in on any adjacent signals. Besides this, the SSB filter will firstly respond to various digital modes, making
it possible to narrow a passband to 50 Hz.
An optional filter no longer needs to be installed at each stage to create a full filter
combination to suit your operating needs.
32-bit Floating Point IF DSP teaming
with 24-bit AD/DA converter
455 kHz
36 kHz
3Lo
Manual
NOTCHIFFilter
DET
AGC
AGC
DSP
D/A
D/AA/D AF
Current
analog filter
IC-756PRO s
digital filter
0
—10
—20
—30
—40
—50
—60
—70
—80
—90
—100
0 200 400 600 800 1000 1200 [Hz]
[dB]
CW Filter
SSB Filter
0
—10
—20
—30
—40
—50
—60
—70
—80
—90
—100
—3000 —2000 —1000 0 1000 2000 3000 [Hz]
[dB]
Speech compressor ON
100 W
Speech compressor OFF
100 W
[Hz]
2000 2050 2100 2150 2200 2250 2300 2350 2400 2450
—15
—20
—25
—30
—10
0
—5
[dB]
Example for
setting time
constant for
the SSB, 2.5.
Mode
Passband width range
50–500 Hz 600–3600 Hz
SSB/RTTY 10; 50 Hz step
31; 100 Hz step
CW 10; 50 Hz step
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