ICOM IC 756 PRO III Brochure

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HF/50MHz ALL MODE TRANSCEIVER

The 756PRO Series L

Legacy Continues to Grow
Icom and the renowned IC-756PRO series continue to make ham radio history:
• First 32-bit floating point DSP transceiver
• First transceiver with customizable filter shapes. There were no optional filters to buy, for none were needed.
• First mid-class HF transceiver with +30dBm-class third-order intercept point*
• First amateur HF transceiver with a large TFT color LCD
For the new IC-756PROIII, Icom’s combined the cutting-edge receiver technology of the IC-7800
with the familiar ergonomics of the IC-756PROII.
Take your DXing to the next level with Icom’s IC-756PROIII.
(*in the 14MHz band)

The 756PRO Third Generation’s new features

The 756PRO Third
New receiver gives +30dBm
third-order intercept point*
Using receiver design techniques introduced in the IC-7800, Icom’s engineering
team focused on producing a distortionfree, high-dynamic-range. To achieve this
goal, Icom used higher-grade components
in vital receiver sections of the IC756PROIII.
* Under the condition of receive frequency 14.2MHz, input frequencies
14.3MHz and 14.4MHz, Pre-amp OFF, mode USB BW: 2.4kHz

Large inductors
The IC-756PROIII uses large inductors instead of small coils in the bandpass filter
(BPF) stage, because small coils sometimes
cause magnetic saturation in the BPF
stage. Large inductors can handle both
strong signals and
weak signals with
Large inductors in the RF stage
lower distortion.

Low-distortion BPF switching
The BPF switching circuitry is one of the
critical points in a receiver where distortion
can be produced by strong out-of-band signals. Distortion at this early receiver stage

then propagates throughout the remaining
stages and cannot be removed by signal
processing. The IC-756PROIII uses low
distortion diodes with wide frequency characteristics that prevent formation of distortion components in the BPF stage.

Fundamental-type 64MHz
roofing filter
The IC-756PROIII uses a fundamentalmode monolithic crystal filter for the roofing
filter. Although it’s more expensive than
overtone-mode filters, the fundamentalmode filter has a better shape factor and is
less susceptible to intermodulation distortion under strongsignal conditions.
This is the same
15kHz crystal filter
used in the IC-7800
roofing filter circuit. Fundamental-type roofing filter

Two newly designed preamplifiers
To minimize distortion and maximize dynamic range, the IC-756PROIII preamplifiers use the same basic circuit design as
the IC-7800 preamplifiers. Preamp-1 is a
noiseless feedback design, with push-pull
amplifiers. This design has a high intercept

d Generation’s new features
point and covers a wide frequency range.
Preamp-2, which uses bipolar transistors
for higher gain, is ideal when you use separate low-efficiency receiving antennas
such as small loops or Beverages.

the receiving frequency. In addition, the
spectrum scope has 3 attenuator levels
(10dB, 20dB and 30dB).

Mini scope screen

Normal spectrum scope screen

Eight-channel RTTY TX memory
RF stage & Preamplifiers

Preamp-1

Preamp-2

Real time spectrum scope
with mini scope function
The real time spectrum scope is now an indispensable tool for top performing HF radios. The IC-756PROIII’s spectrum scope
adds a mini scope function, as requested
by many PROII users. The mini scope allows you to monitor the scope screen while
you use other function menus. For example, you can monitor the scope screen
even while you are changing the IF filter
shape and passband width. The scope
range can be set in 4 steps ±12.5 kHz, ±25
kHz, ±50 kHz and ±100 kHz, centered on

The IC-756PROIII has 8 channels of RTTY
transmit memory. You can edit and send up
to a 62 character message for each memory channel without a PC or other external
unit*. The transmit memory is displayed on
the screen so you won’t send the wrong
message. The built-in RTTY demodulator
and decoder allow you to check the callsign
of the station on the air instantly. A PC or
external unit is not also necessary.
* When

writing and
sending RTTY messages on site, a Terminal Unit, TNC or PC
and dedicated software is required.

Adjustable SSB transmit BW
The SSB transmit bandwidth is selectable
from 100, 300 and 500Hz at the high-pass
edge, and 2500, 2700 and 2900Hz at the
low-pass edge respectively. 3 types of high
and low combinations can be stored in the
memory. In addition, the built-in audio
equalizer has separate bass and treble adjustments for a total of 121 combinations,
so you can tone your voice up or down as
you want. With this
flexible DSP-based
waveform shaping,
you can tailor your
transmit audio quality to suit your operSSB transmit bandwidth setting
ating style.

Other new features
• New 60 meter band coverage, equivalent
transmit power and antenna tuner capabilities to the other bands.
(U.S.A. version, USB mode only)

RTTY transmit memory screen

• 2 clocks show different time zones at
once, such as local and UTC time.
• Screen saver function
• @ code (• – – • – • ), used in e-mail addresses, added to memory keyer

32-bit floating point DSP &
24-bit AD/DA converters
The heart of the IC-756PRO III is the
proven combination of the 32-bit floating
point DSP and 24-bit AD/DA converters.
This powerful combination supports many
digital processing features exclusive to the
IC-756PRO III, which cannot be achieved
with traditional analog processors. The 24bit AD/DA converter has an ultra-wide dynamic range. The
receiver delivers a distortion-free,
clear
sound in any signal
condition, from a weak
signal to a strong full
power station.

AGC loop management
The digital IF filter and manual notch filter
are included in the AGC loop driven by the
DSP. This architecture completely eliminates “AGC pumping” caused by adjacent
strong signals out of the IF filter passband.
In addition, programmable AGC time constants* (slow, medium, and fast presets) give
flexibility and speed needed for working the
pile-ups.

Dual watch
The dual watch* function allows you to receive 2 signals on the same band simultaneously. You can listen to your favorite net
while keeping an eye or ear on the DX station. The signal strength balance between
the main and sub frequencies is adjustable
from the balance knob. (* Same band only)

Digital twin PBT
DSP-based twin passband tuning (PBT)
helps eliminate interference by changing the
IF filter bandwidth and/or shifting the center
frequency. With the digital IF filters, the PBT
performance allows you to cut away all the
interference and noise to hear the actual
signal. The LCD indicates the twin PBT conditions across the top of the screen.

Manual notch function
An incredible 70dB of attenuation is at your
command with the manual notch. Eliminate
strong adjacent signals or beat tone noise,
without reducing the performance of the
AGC gain.
[dB]
20

Manual Notch characteristics

0

* Except FM mode.
z
kH
36

5k

H

z

–20

45

Inherited Properties From the 756PROII

Inherited Propert

–40

DET

A/D
Manual
NOTCH
3Lo
AGC

D/A

IF
Filter

–60

AGC

–80

DSP

–100
–800

–600

–400

–200

0

200

400

600

800 [Hz]

Sharp and soft filter shapes are selectable for SSB and CW mode
Select an appropriate filter shape that favors your operating style or band conditions.
Independent SSB and CW filter gives you the flexibility.

SSB Sharp Filter

SSB Soft Filter

The perfect filter shape factor when signal fidelity or pinpoint accuracy is
needed! A sharp slope from the filter
edges gives full audio response while
eliminating any adjacent interference.

The perfect filter shape factor when trying to pick out a weak signal! The
rounded filter shape resembles a traditional analog filter, by rolling off the high
and low ends of the passband. Although
maintaining the steep filter skirt characteristics of a digital filter, the soft filter increases the signal-to-noise ratio of the
intended signal.

CW Sharp Filter
The “too good to be true” CW filter! The
steep filter skirts — only 200Hz from the
–6dB to the –60dB points — allow you to
hear a weak CW signal that is surrounded by strong ones. DX hunters will
have to try this
one to really see
the magic of the
Sharp CW filter.
Filter shape setting – SSB, CW, sharp

CW Soft Filter
Running a pile-up has become easier
with the soft CW filter. By broadening the
filter skirt, the characteristics of the soft
filter perform much like a mechanical filter without the ringing.

ties From The 756PROII
Automatic notch function
Eliminate annoying AM carriers, amplifier or
radio tune up interference with a push of a
button. The automatic notch tracks 2 or
more interfering signals simultaneously
without intended signal loss or distortion.
Very helpful on 80 and 160 meters.

Adjustable noise reduction
The 32-bit DSP processing power produces real results by separating signal
components from the noise with the variable Noise Reduction. By suppressing the
noise components, an outstanding Signalto-noise ratio is achieved, providing clear,
clean audio in all modes without distortion
of the target signal.
Audio output comparison
NR OFF

NR ON

Adjustable noise blanker
Reduce annoying QRN from pulse-type
noise such as engine ignition systems and
sparking appliance motors, with the fully
adjustable (101 steps) noise blanker.

Digital voice recorder
The Digital Voice Recorder (DVR) is a very
convenient function for contests, DXpeditions and even normal operation. Record
your callsign, CQ, or other station information into four memory locations. A total of
90 seconds is available for the four memories, with each memory channel being soft
partitioned to allow custom recording sizes.
A quick push of the front-panel DVR button
allows you to record received signal into the
R4 memory. The playback automatically
mutes the receiver for clear playback of the
previous 15 seconds of recorded
audio. The perfect
feature for those
contest operators
wanting to improve
their UBN.
Digital voice recorder

CW memory keyer
A must have feature for the CW operator,
the internal memory keyer provides 4 memories for programming station information,
calling CQ and callsign. Each memory has
a capacity of 55 characters, as well as
other time saving functions such as auto-

matic repeat, serial contest number autocounter, and morse cut number functions.

Digital RF speech compressor
The IC-756PROIII utilizes the 32-bit DSP
for the RF speech compressor providing
the maximum punch without the fuzzy
sound. Great for breaking through the noise
and hash to complete the QSO.
Speech compressor ON

Speech compressor OFF

100W

2.5ms/Div

Highly stable transmitter
For a big, clear signal, the IC-756PROIII
uses two 2SC5125 transistors in the PA
Unit. Along with superior IMD characteristics, these transistors have plenty of power
to allow for 100W full duty cycle operation.
Advanced design considerations along with
an aluminum, die-cast frame, and large
cooling fan, help to stabilize the PA circuit
providing full duty cycle operation.

High stability crystal unit
The IC-756PROIII incorporates a high-stability master oscillator, providing ±0.5ppm
(–10ºC to +50ºC). A must for RTTY, SSTV or
M A R S
operation.

Crystal oscillator

Triple band stacking register
Hop around the band with Icom’s exclusive
triple band stacking registers. Each band
remembers the last 3 frequencies, mode
and other settings used.

5-inch TFT color LCD
Enjoy the full 5-inch TFT color display. The
IC-756PROIII has 8 colors of display settings and 7 types of font settings. Various
information is indicated on the color LCD,
separated into an upper and lower screen.
The lower screen can spread vertically to
increase the information viewing area.

Other features
[Antenna and receiver] • Built-in highspeed auto antenna tuner • 2 TX/RX antenna connectors and RX antenna
connector • 30kHz–60MHz general coverage receiver* • Built-in RX attenuator
(6/12/18dB) • Twin peak audio filter for
RTTY reception
[Transmitter] • Tx monitor function • Tone
encoder • VOX operation • All mode power
control • External Control for Voice Memory
and Memory Keyer
[CW mode] • CW Wave form controlled by
the DSP • Multi-function electronic keyer includes adjustable keying speed and
dot/dash ratio, polarity, bug keyer • Continuously adjustable CW pitch control from
300–900Hz • Double key jacks (Front and
rear panels) • Full break-in (QSK) • CW reverse
[Operation] • Set mode menu for speedy
setting • Analog and digital meter indicates
relative output power, SWR, ALC level and
compression level • Memory pad stores up
to 5 or 10 operating frequencies and
modes • Quick split function • RF gain and
squelch control • ±9.999kHz Adjustable RIT
and ∂TX • 1Hz step tuning and display
• 101 memory channels with 10-character
channel name • Optional Voice synthesizer
announces the operating frequency, mode
and
signal
strength
in
English
• Program, memory, select memory, ∂f
scans • Auto tuning step function • Dial lock
• Band edge beep (can be disabled)
• AH-4 control circuit • Automatic tuning
speed • CI-V interface with optional CT-17
for PC remote control
(* Depending on version)

SSB data communication
When the IF filter passband is reduced to
500Hz or less in SSB/SSB data mode, special bandpass filters are automatically selected. The BPF automatically sharpen for
better rejection of interfering signals. Along
with the BPF, the IC-756PROIII automatically turns off the compression and enables
the 1/4-tuning step for easier operation and
more accurate tuning. Perfect for PSK31,
SSTV or other AFSK modes.

•Rear View

HF/50MHz ALL MODE TRANSCEIVER
SPECIFICATIONS
GENERAL

• Frequency coverage

TRANSMITTER

:

USA version
Rx
0.030– 60.000MHz*1
Tx
1.800– 1.999MHz
3.500– 3.999MHz
5.3305, 5.3465, 5.3665, 5.3715, 5.4035MHz*2
7.000– 7.300MHz
10.100–10.150MHz
14.000– 14.350MHz
18.068–18.168MHz
21.000– 21.450MHz
24.890–24.990MHz
28.000– 29.700MHz
50.000–54.000MHz
Europe version
1
Rx
0.030– 60.000MHz*
Tx
1.810– 1.999MHz
3.500– 3.800MHz
7.000– 7.100MHz
10.100–10.150MHz
14.000– 14.350MHz
18.068–18.168MHz
21.000– 21.450MHz
24.890–24.990MHz
28.000– 29.700MHz
50.000–52.000MHz
* Some freq. bands are not guaranteed.
1

• Mode
• Number of memory Ch.
• Antenna connector
• Temperature range
• Frequency stability

* USB mode only
2

: USB, LSB, CW, RTTY, AM, FM
: 101 (99 regular, 2 scan edges)
: SO-239×2 and phono [RCA; (50Ω)]
: –10˚C to +50˚C; +14˚F to +122˚F
: Less than ±0.5ppm (1 min. after power

• Output power
: SSB, CW, RTTY, FM
5–100W
(continuously adjustable) AM
5–40W
• Modulation system
: SSB
DPSN modulation
AM
Digital low power modulation
FM
Digital phase modulation
• Spurious emission
: Less than –50dB (HF bands)
Less than –60dB (50MHz band)
• Carrier suppression
: More than 40dB
• Unwanted sideband suppression:
More than 55dB
• Microphone connector : 8-pin connector (600Ω)

RECEIVER
• Receive system

: Triple conversion superheterodyne
system
• Intermediate frequencies : 1st
64.455MHz (for all modes)
2nd
455kHz (for all modes)
3rd
36kHz (for all modes)
• Sensitivity (typical)
:
Frequency SSB, CW, RTTY
Range (MHz) (at 2.4kHz BW)
0.50–1.799
—
1.80–27.99
0.16µV*1
28.0–29.99
0.16µV*1

ON; 0˚C to 50˚C; +32˚F to +122˚F)

• Frequency resolution
: 1Hz
• Power supply requirement : 13.8V DC ±15% (negative ground)
• Power consumption
: Tx
Max. power
23A
Rx
Standby
3.0A (typ.)
Max. audio
3.5A (typ.)
• Dimensions
: 340(W)×111(H)×285(D) mm;
(projections not included)
133⁄8(W)×43⁄8(H)×117⁄32(D) in
• Weight (approx.)
: 9.6kg; 21lb 1oz
The LCD display may have cosmetic imperfections that appear as tiny spots.
This is not a malfunction or defect, but a normal characteristic of LCD displays.

50.0–54.0

• Selectivity (representative value):
SSB, RTTY
More than 2.4kHz/–6dB
(BW: 2.4kHz)
Less than 3.2kHz/–40dB
Less than 3.6kHz/–60dB
Less than 4.3kHz/–80dB
CW (BW: 500Hz)
More than 500Hz/–6dB
Less than 700Hz/–60dB
AM (BW: 6kHz)
More than 6.0kHz/–6dB
Less than 15.0kHz/–60dB
More than 12.0kHz/–6dB
FM (BW: 15kHz)
Less than 20.0kHz/–60dB
• Spurious and image
: More than 70dB
rejection ratio
(except IF through on 50MHz band)
• AF output power
: More than 2.0W at 10% distortion
(at 13.8V DC)
with an 8Ω load
• RIT variable range
: ±9.999kHz
• PHONES connector
: 2-pin connector 6.35 (d) mm (1⁄4″)
• EXT SP connector
: 2-pin connector 3.5 (d) mm (1⁄4″)/8Ω
ANTENNA TUNER
• Matching impedance range:
HF bands
16.7–150Ω unbalanced*1
50MHz band
20–125Ω unbalanced*2

AM

FM

(at 6kHz BW)

(at 15kHz BW)

*1Less than VSWR 3:1; *2Less than VSWR 2.5:1

13µV
2µV*1
2µV*1

—
—
0.5µV*1

• Min. operating input power: 8 W
• Tuning accuracy
: VSWR 1.5:1 or less

1µV*2

0.32µV*2

• Insertion loss

0.13µV*2

(SWR after the motor has stopped)

: Less than 1.0dB (after tuning)

10dB S/N for SSB, CW, RTTY and AM, 12dB SINAD for FM
*1Pre-amp 1 is ON, *2Pre-amp 2 is ON

• Squelch sensitivity (Pre-amp: OFF):
SSB, CW, RTTY
Less than 5.6µV
FM
Less than 1µV

Supplied accessories:
• Hand microphone
• Spare fuses

All stated specifications are subject to change without notice or obligation.

• DC power cable
• CW key plug

OPTIONS

AH-4 HF+50MHz AUTOMATIC ANTENNA TUNER
IC-PW1/IC-PW1EURO HF+50MHz 1kW LINEAR AMPLIFIER

AH-2b ANTENNA ELEMENT

CT-17 CI-V LEVEL CONVERTER

Covers 3.5–54MHz with a 7m (23 ft) or
longer wire antenna.

A 2.5m long antenna element for mobile
operation with the AH-4. All amateur bands
between 7–54 MHz can be matched.

For remote transceiver control using a PC
equipped with an RS-232C port. You can
change frequencies, operating mode, etc.

Covers all HF and 50MHz bands, provides clean, stable 1kW output. Automatic antenna
tuner and compact detachable controller are standard. 2 exciter inputs are available.

HM-36 HAND MICROPHONE

PS-125 DC POWER SUPPLY

SM-20 DESKTOP MICROPHONE

SP-23 EXTERNAL SPEAKER

UT-102 VOICE SYNTHESIZER UNIT

Same as supplied.

Style and size are matched to the IC756PROIII.
13.8V DC, 25A max.

Unidirectional, electret microphone for base
station operation. [UP/DOWN] switches
and a low cut function are available.

4 audio filters; headphone jack.
Input impedance: 8Ω
Max. input power: 5W

Announces operating frequency and mode
in English.

1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan Phone: +81 (06) 6793 5302

Fax: +81 (06) 6793 0013

URL: http://www.icom.co.jp/world/index.html

2380 116th Avenue NE,
Bellevue, WA 98004, U.S.A.
Phone : +1 (425) 454-8155
Fax
: +1 (425) 454-1509
E-mail : sales@icomamerica.com
URL : http://www.icomamerica.com

146A Harris Road, East Tamaki,
Auckland, New Zealand
Phone : +64 (09) 274 4062
Fax
: +64 (09) 274 4708
E-mail : inquiries@icom.co.nz
URL : http://www.icom.co.nz

Unit 9, Sea St., Herne Bay,
Kent, CT6 8LD, U.K.
Phone : +44 (01227) 741741
Fax
: +44 (01227) 741742
E-mail : info@icomuk.co.uk
URL : http://www.icomuk.co.uk

6F No. 68, Sec. 1 Cheng-Teh Road,
Taipei, Taiwan, R.O.C.
Phone : +886 (02) 2559 1899
Fax
: +886 (02) 2559 1874
E-mail : sales@asia-icom.com
URL : http://www.asia-icom.com

Glenwood Centre #150-6165 Highway 17,
Delta, B.C., V4K 5B8, Canada
Phone : +1 (604) 952-4266
Fax
: +1 (604) 952-0090
E-mail : info@icomcanada.com
URL : http://www.icomcanada.com

Communication Equipment
Himmelgeister Str. 100,
D-40225 Düsseldorf, Germany
Phone : +49 (0211) 346047
Fax
: +49 (0211) 333639
E-mail : info@icomeurope.com
URL : http://www.icomeurope.com

Zac de la Plaine, 1,
Rue Brindejonc des Moulinais BP 5804,
31505 Toulouse Cedex, France
Phone : +33 (5) 61 36 03 03
Fax
: +33 (5) 61 36 03 00
E-mail : icom@icom-france.com
URL : http://www.icom-france.com

10C07, Long Silver Mansion, No.88, Yong Ding
Road, Haidian District, Beijing, 100039, China
Phone : +86 (010) 5889 5391/5392/5393
Fax
: +86 (010) 5889 5395
E-mail : bjicom@bjicom.com
URL : http://www.bjicom.com

Crta. de Gracia a Manresa Km. 14,750
08190 Sant Cugat del Valles Barcelona, Spain
Phone : +34 (93) 590 26 70
Fax
: +34 (93) 589 04 46
E-mail : icom@icomspain.com
URL : http://www.icomspain.com

Sopot, 3 maja 54, Poland
Phone : +48 (58) 550 7135
Fax
: +48 (58) 551 0484
E-mail : icompolska@icompolska.com.pl
URL : http://www.icompolska.com.pl

A.B.N. 88 006 092 575
Unit 1 / 103 Garden Road,
Clayton VIC 3168 Australia
Phone : +61 (03) 9549 7500
Fax
: +61 (03) 9549 7505
E-mail : sales@icom.net.au
URL : http://www.icom.net.au

JP98/14190QA

Count on us!

Your local distributor/dealer:

TW03/00288EM

Icom Inc. (Japan), is an ISO 9001 and ISO
14001 certification acquired company.

04WS014B* © 2004–2005 Icom Inc.

Printed in Japan



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