ICOM IC 756 PRO III Brochure

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HF/50MHz ALL MODE TRANSCEIVER

The 756PRO Series L

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)

Legacy Continues to Grow

New receiver gives +30dBm

third-order intercept point*

Using receiver design techniques intro-

duced in the IC-7800, Icom’s engineering

team focused on producing a distortion-

free, high-dynamic-range. To achieve this

goal, Icom used higher-grade components

in vital receiver sections of the IC-

756PROIII.

* 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 in-

stead of small coils in the bandpass filter

(BPF) stage, because small coils sometimes

cause magnetic sat-

uration in the BPF

stage. Large induc-

tors can handle both

strong signals and

weak signals with

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 sig-

nals. 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 char-

acteristics that prevent formation of distor-

tion components in the BPF stage.

Fundamental-type 64MHz

roofing filter

The IC-756PROIII uses a fundamental-

mode monolithic crystal filter for the roofing

filter. Although it’s more expensive than

overtone-mode filters, the fundamental-

mode filter has a better shape factor and is

less susceptible to intermodulation distor-

tion under strong-

signal conditions.

This is the same

15kHz crystal filter

used in the IC-7800

roofing filter circuit.

Two newly designed preamplifiers

To minimize distortion and maximize dy-

namic range, the IC-756PROIII preampli-

fiers 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

Fundamental-type roofing filter

The 756PRO Third

Large inductors in the RF stage

The 756PRO Third 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 sep-

arate low-efficiency receiving antennas

such as small loops or Beverages.

Real time spectrum scope

with mini scope function

The real time spectrum scope is now an in-

dispensable tool for top performing HF ra-

dios. The IC-756PROIII’s spectrum scope

adds a mini scope function, as requested

by many PROII users. The mini scope al-

lows you to monitor the scope screen while

you use other function menus. For exam-

ple, 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 receiving frequency. In addition, the

spectrum scope has 3 attenuator levels

(10dB, 20dB and 30dB).

Eight-channel RTTY TX memory

The IC-756PROIII has 8 channels of RTTY

transmit memory. You can edit and send up

to a 62 character message for each mem-

ory 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 mes-

sages on site, a Termi-

nal Unit, TNC or PC

and dedicated soft-

ware 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 ad-

justments 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 qual-

ity to suit your oper-

ating style.

Other new features

• New 60 meter band coverage, equivalent

transmit power and antenna tuner capa-

bilities to the other bands.

(U.S.A. version, USB mode only)

• 2 clocks show different time zones at

once, such as local and UTC time.

• Screen saver function

• @ code (• – – • – • ), used in e-mail ad-

dresses, added to memory keyer

RTTY transmit memory screen

SSB transmit bandwidth setting

Mini scope screen Normal spectrum scope screen

d Generation’s new features

Preamp-1 Preamp-2

RF stage & Preamplifiers

32-bit floating point DSP &

24-bit AD/DA converters

The heart of the IC-756PROIII 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-756PROIII, which cannot be achieved

with traditional analog processors. The 24-

bit AD/DA converter has an ultra-wide dy-

namic range. The

receiver delivers a dis-

tortion-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 elimi-

nates “AGC pumping” caused by adjacent

strong signals out of the IF filter passband.

In addition, programmable AGC time con-

stants* (slow, medium, and fast presets) give

flexibility and speed needed for working the

pile-ups.

* Except FM mode.

Dual watch

The dual watch* function allows you to re-

ceive 2 signals on the same band simulta-

neously. You can listen to your favorite net

while keeping an eye or ear on the DX sta-

tion. 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 con-

ditions 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.

455kHz

36kHz

3Lo

Manual

NOTCH IF

Filter

DET

AGC

AGC DSP

D/A

A/D

20

–20

–40

–60

–80

–100 –600 –400 –200 0 200 400 600 800 [Hz]

[dB]

0

–800

Manual Notch characteristics

Inherited Propert

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

The perfect filter shape factor when sig-

nal fidelity or pinpoint accuracy is

needed! A sharp slope from the filter

edges gives full audio response while

eliminating any adjacent interference.

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 sur-

rounded by strong ones. DX hunters will

have to try this

one to really see

the magic of the

Sharp CW filter.

SSB Soft Filter

The perfect filter shape factor when try-

ing to pick out a weak signal! The

rounded filter shape resembles a tradi-

tional analog filter, by rolling off the high

and low ends of the passband. Although

maintaining the steep filter skirt charac-

teristics of a digital filter, the soft filter in-

creases the signal-to-noise ratio of the

intended signal.

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 fil-

ter without the ringing.

Filter shape setting – SSB, CW, sharp

Inherited Properties 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 pro-

duces real results by separating signal

components from the noise with the vari-

able Noise Reduction. By suppressing the

noise components, an outstanding Signal-

to-noise ratio is achieved, providing clear,

clean audio in all modes without distortion

of the target signal.

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, DXpedi-

tions and even normal operation. Record

your callsign, CQ, or other station informa-

tion into four memory locations. A total of

90 seconds is available for the four memo-

ries, with each memory channel being soft

partitioned to allow custom recording sizes.

Aquick 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 sec-

onds of recorded

audio. The perfect

feature for those

contest operators

wanting to improve

their UBN.

CW memory keyer

Amust have feature for the CW operator,

the internal memory keyer provides 4 mem-

ories 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 auto-

counter, 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.

Highly stable transmitter

For a big, clear signal, the IC-756PROIII

uses two 2SC5125 transistors in the PA

Unit. Along with superior IMD characteris-

tics, 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-sta-

bility master oscillator, providing ±0.5ppm

(–10ºC to +50ºC). A must for RTTY, SSTV or

MARS

operation.

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.

SSB data communication

When the IF filter passband is reduced to

500Hz or less in SSB/SSB data mode, spe-

cial bandpass filters are automatically se-

lected. The BPF automatically sharpen for

better rejection of interfering signals. Along

with the BPF, the IC-756PROIII automati-

cally 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.

5-inch TFT color LCD

Enjoy the full 5-inch TFT color display. The

IC-756PROIII has 8 colors of display set-

tings 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 high-

speed auto antenna tuner • 2 TX/RX an-

tenna connectors and RX antenna

connector • 30kHz–60MHz general cover-

age 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 in-

cludes adjustable keying speed and

dot/dash ratio, polarity, bug keyer • Contin-

uously adjustable CW pitch control from

300–900Hz • Double key jacks (Front and

rear panels) • Full break-in (QSK) • CW re-

verse

[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)

•Rear View

Digital voice recorder

ties From The 756PROII

Crystal oscillator

Speech compressor ON

Speech compressor OFF

2.5ms/Div

100W

Audio output comparison

NR OFF NR ON

•Frequency coverage :

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

Rx 0.030– 60.000MHz*1

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

*1Some freq. bands are not guaranteed. *2USB mode only

•Mode : USB, LSB, CW, RTTY, AM, FM

•Number of memory Ch. : 101 (99 regular, 2 scan edges)

•Antenna connector : SO-239×2 and phono [RCA; (50Ω)]

•Temperature range : –10˚C to +50˚C; +14˚F to +122˚F

•Frequency stability : Less than ±0.5ppm (1 min. after power

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

•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)

•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) :

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

•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

FM (BW: 15kHz) More than 12.0kHz/–6dB

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 8Ωload

•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

•Matching impedance range:

HF bands 16.7–150Ωunbalanced*1

50MHz band 20–125Ωunbalanced*2

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

•

Min. operating input power

: 8 W

•Tuning accuracy : VSWR 1.5:1 or less

(SWR after the motor has stopped)

•

Insertion loss

:Less than 1.0dB

(after tuning)

SPECIFICATIONS

1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan Phone: +81 (06) 6793 5302 Fax: +81 (06) 6793 0013

Count on us!

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

Printed in Japan

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

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

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

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

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

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

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

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

Your local distributor/dealer:

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

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

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

JP98/14190QA TW03/00288EM

Icom Inc. (Japan), is an ISO 9001 and ISO

14001 certification acquired company.

04WS014B* © 2004–2005 Icom Inc.

HF/50MHz ALL MODE TRANSCEIVER

GENERAL

OPTIONS

RECEIVER

TRANSMITTER

AH-4

HF+50MHz AUTOMATIC AN-

TENNA TUNER

Covers 3.5–54MHz with a 7m (23 ft) or

longer wire antenna.

AH-2b ANTENNA ELEMENT

A2.5m long antenna element for mobile

operation with the AH-4. All amateur bands

between 7–54 MHz can be matched.

CT-17

CI-V LEVEL CONVERTER

For remote transceiver control using a PC

equipped with an RS-232C port. You can

change frequencies, operating mode, etc.

UT-102 VOICE SYNTHESIZER UNIT

Announces operating frequency and mode

in English.

SM-20 DESKTOP MICROPHONE

Unidirectional, electret microphone for base

station operation. [UP/DOWN] switches

and a low cut function are available.

HM-36

HAND MICROPHONE

Same as supplied.

ANTENNA TUNER

Supplied accessories:

•Hand microphone •DC power cable

•Spare fuses • CW key plug

SP-23

EXTERNAL SPEAKER

4 audio filters; headphone jack.

Input impedance: 8Ω

Max. input power: 5W

PS-125

DC POWER SUPPLY

Style and size are matched to the IC-

756PROIII.

13.8V DC, 25A max.

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

Frequency

SSB, CW, RTTY

AM FM

Range (MHz) (at 2.4kHz BW) (at 6kHz BW) (at 15kHz BW)

0.50–1.799 — 13µV —

1.80–27.99 0.16µV*12µV*1—

28.0–29.99 0.16µV*12µV*10.5µV*1

50.0–54.0 0.13µV*21µV*20.32µV*2

IC-PW1/IC-PW1EURO HF+50MHz 1kW LINEAR AMPLIFIER

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.

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.