HF/50 MHz ALL MODE TRANSCEIVER

RELAYING THE REAL MEANING OF PLEASURE INTO THE AMATEUR RADIO WORLD. MATERIALIZING TECH-NIQUES NOT PREVIOUSLY ACHEIVABLE, THE IC-756PRO AND ICOM WILL TAKE YOU, YOUR TRANSCEIVERAND OPERATING CAPABILITIES INTO A NEW POWER PERFORMING DIMENSION. BECOMING THE BESTOF 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 GIVEYOU AN ADVANTAGE, AND BACKED BY PERFOR-MANCE THAT WILL KEEP YOUR COMPETITION ONTHEIR TOES. ICOM TECHNOLOGY, STARTING ANEW DIMENSION.

HF/50 MHz ALL MODE TRANSCEIVER

THE DIGITAL REVOLUTIONJUST TOOK A HUGE LEAPFORWARD

It began with developing the ultimate in IF-DSP

HF transceivers with DSP are being intro-duced one after the other. Icom has takenthe lead over other transceivers by notjust using existing DSP, but in an effort tocreate the pinnacle in this technology, hasdeveloped an all new, original DSP unit.

Equipping the 32-bit Floating PointDSP— first in amateur equipment

The 32-bit Floating Point DSP— this DSPprovides a much wider and precise pro-cessing ability than 16-bit Fixed PointDSP, did with previous DSP transceivers.And also, the built-in 24-bit AD/DA con-verter helps to realizeultra wide dynamic rangeoperation. The result is,this unique Icom technol-ogy has made it possibleto realize unparalleledperformance, deservedlyfitting of the name ‘PRO’.

Taking the potential of the transceiverto heights unimaginable, until now.

The combination of the 32-bit FloatingPoint DSP and 24-bit AD/DA converter isloaded with superior digital functions neverbefore available with previous DSP units.With the DSP controlled AGC loop man-agement, it is now possible to achievepure digital functions. The digital IF filter,digital twin PBT and manual notch, theelimination of radio interference, unrivaledtransmission and reception S/N, ultra-lowdistortion transmission and reception tonequality etc., is delivered. The search byIcom for the ultimate HF transceiver, re-sulted in the 32-bit Floating Point DSP and

24-bit AD/DA converter,and brought to life in theIC-756PRO. The moststriking impression of theability of this technologyis without a doubt, theperformance of the digitalIF filter.

For the efficient operation of all functions.

In particular, people on the DX or contestfront lines demand instant response. So,Icom has incorporated a 5-inch TFT colorLCD in the IC-756PRO. The LCD, withsuperior visibility and various types of in-formation clearly defined, has been de-signed to lessen the burden of theoperator, while increasing accuracy andease of understanding.

We completely redesigned the wholetransmitter and receiver.

The IC-756PRO was designed to be the‘Ultimate HF Transceiver’. It is possible toupgrade and make a better machine fromthe previous IC-756. But it is even betterstill, to completely rethink and redesign, andin the process, create revolutionaryprogress in technology. It was this revolu-tionary thinking that lead to the creation andrealization of the ultimate in everything aDSP machine should be, the ‘IC-756PRO’.

32-bit floating point DSP

To dramatically increase the ability of alldigital functions in this all mode trans-ceiver, the latest technology has beenused and a newly designed DSP hasbeen created. The IC-756PRO, has em-ployed an originally designed 32-bit float-ing point DSP unit. Along with this, seesthe adoption of the 24-bit AD/DA con-verter making a formidable team withample capacity. Especially with the re-ceive signal input, the AD/DA converterprovides ultra wide dynamic range, 144dB*, of signal management. Clear signalswithout any distortion are realized even inany signal conditions, such as very weakor extremely strong signals from nearbystations. The DSP has extremely highperformance processing ability, which dra-matically improves signal resolution, aswell as both transmission and receptionS/N ratio, and allows more high perfor-mance 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 con-trolled by the 32-bit floating point DSP.This system removes blocking by ex-tremely strong adjacent signals in out offilter passbands. Therefore, you will neverhave to suffer blocking of the AGC again.The result is that even very weak signalscan be extracted from the noise level inbetween crowded strong signals clearly!In addition, the AGC time constant, (threepresettable slow, medium and fast) are flexi-bly adjustable for each operating mode tosuit operating band conditions, operatingstyle, etc.

RF speech compressor

The IC-756PRO has truly drawn the linebetween previous models and their stan-dard equipped compressors. The 32-bitcapacity provided from the DSP, allowsthe speech compressor to compress thetransmitter IF signal, therefore, averagetalk power is increased. This function ofcourse is effective for long distance com-munication, or when propagation condi-tions are poor. IC-756PRO keeps thelevel of distortion to it’s lowest extremity atmaximum compression. In turn this en-sures that your fellow ham enthusiastsare presented with quality readability. Inaddition, the transmit bandwidth is selec-table, regardless of the speech compres-sor activity, from 2.2, 2.4 and 2.8 kHz tosuit operating band conditions, etc.

Twin peak audio filter

A twin peak audio filter has been built in. 2specified audio frequencies only arepassed through the filter in the DSP foraccurately receiving an RTTY signal, for aprofound decoding rate. You will see adramatic improvement in the quality ofS/N, as well as removing interfering CWsignals, etc.

Edge cutting IF filter

The IC-756PRO is equipped with a digital IF filter that can be set from a total of 51passband widths. Unacheived with previous analog filters, the IC-756PRO fields anoutstanding inclusion with it’s shape factor. Sharply cutting in on any adjacent sig-nals. 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 in-stalled at each stage to create a full filtercombination to suit your operating needs.

32-bit Floating Point IF DSP teamingwith 24-bit AD/DA converter

455

kHz

36 kH

z

3LoManualNOTCH

IFFilter

DET

AGCAGC

DSPD/A

D/AA/D AF

Currentanalog filter

IC-756PRO sdigital filter

0

—10

—20

—30

—40

—50

—60

—70

—80

—90

—1000 200 400 600 800 1000 1200 [Hz]

[dB] CW FilterSSB Filter0

—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 forsetting timeconstant forthe SSB, 2.5.

ModePassband width range

50–500 Hz 600–3600 HzSSB/RTTY 10; 50 Hz step

31; 100 Hz stepCW 10; 50 Hz step

Microphone equalizer

In the high/low sound ranges, there are 11d i fferent levels respectively, which can setfrequency properties. Totalling 121 vari-eties equalized audio can be set with thebuilt in microphone audio equalizer. Suit-able transmit audio can be easily andfreely set using the equalizer according tooperating style, and your personal prefer-ence.

Manual notch capability

The 32-bit floating point DSP has also al-lowed the inclusion of possible manualnotch operation, as well as equipping cur-rent auto notch function. The manualnotch filter achieves more than 70 dB ofattenuation level, and with it’s sharp cut-ting characteristics, the manual notchfunction can accordingly be adjusted tobeat unwanted signals, while protectingthe desired signal— very weak signalsburied in extremely strong beat signals,can be received. Of course with the autonotch function, the notch frequency is au-tomatically adjusted to follow interferingbeat signals— reducing interference fromsweeping beat signals, etc.

DPSN

A digital PSN (Phase Shift Network) is em-ployed at the modulator using an original90˚ phase shifter architecture. The resultis consistently reproducible, clear andhigh quality transmit audio for all voice op-erations. In addition, the DPSN also al-lows SSB operation with superior carriersuppression and unwanted sideband re-jection ratio.

RTTY demodulator

The first in the world, the Baudot RT T Ydemodulator and decoder, boasting a su-perb decoding rate capability, is built-in.Of course, the received alphanumeric de-tails of RT T Y signal are indicated on theLCD display— you don’t need externalunits for RT T Y receiving any more! T h ebuilt-in tuning indicator, located at the topof the LCD, can visually recognize thetuning condition, and in combination withthe 1⁄4 speed dialling function, allows quickand simple zero-in, evenif you are new at or inter-ested in RT T Y r e c e i v i n g .

Digital noise reduction

The newly designed DSP digitally sepa-rates desired signal components fromnoise components. Outstanding signal tonoise ratio is achieved, providing clean,clear audio in SSB, easy-to-copy RT T Yand crisp, clear SSTV reception. In addi-tion, the digital noise reduction has con-tinuously adjustable noisesuppression capabilities—

complicated, high level ofalgorithms are instanta-neously managed by the32-bit floating-point DSP.

CW wave form

With the CW wave form being created inthe DSP— it now has been made possi-ble to materialize CW transmissions withdesired leading and trailing edge charac-teristics. The characteristics are selec-table from 4 available steps to suit youroperating style. 2, 4, 6 and 8 msec. char-acteristics are available

Example forreceiving anRTTYsignal

Spectrum scope

A real time spectrum scope is ideal formonitoring conditions around the dis-played frequency (including relative signalstrengths). With the main frequency dis-played at the center, the sweep frequencyrange (span) is selectable from four indi-vidual levels; ±12.5 kHz, ±25 kHz,±50 kHz, and ±100 kHz for convenient ob-servation at a glance. Furthermore, IC-756PRO’s spectrum scope sports full dotLCD features, including a peak hold func-tion that can set 2 contrasting colors if pre-ferred— Making distinction between bandseasy, and especially for detecting on airstations, has an unsurpassed capability.

Performing foundations

The IC-756PRO covers a wide frequencyrange, 30 kHz to 60 MHz (except some fre-quency bands), with superior performance.A wide dynamic range of 105 dB*, and ahigh intercept point of +23 dBµ*! Ofcourse, Icom’s original DDS (Direct DigitalSynthesizer) is adopted, and it provides asuperior C/N ratio.*Not guaranteed; Rx: 14.1 MHz, interferingfreq.: F1=14.2 MHz, F2=14.3 MHz; IF pass-band width=500 Hz

High frequency stability

A high stability crystal unit, CR-338, is usedfor the PLL ref-erence oscilla-tor, allowing±0.5 ppm (–10˚Cto 50˚C) of ex-tremely high sta-ble operation.

Digital voice memories

Weather you’re contesting or on a DX’-pedition, the digital voice memories are abuilt-in feature you’ll really appreciate. Atotal of 8 memories, 4 each for transmitand receive, with 15 sec. of storage spaceper location, use the recorder for callingCQ, reporting call sign, or any other con-tinuously repeated audio. Of courserecord and playback audio quality is re-markably high.

Highly stable transmitter

The IC-756PRO has a newly adoptedhigh rating power transistor (2SC5125 × 2)in the PA circuit, and with the realizationof superior IMD characteristics, this allmode transceiver easily ensures an out-put of 100 W. The SSB modulator hasalso been able to adopt the PSN modula-tor in the 32-bit DSP. This creates a 10 dBimprovement in the S/N ratio compared toprevious models. Advanced design con-siderations along with an aluminum, die-cast frame, and large cooling fan, help tostabilize the PA circuit providing this100%, full duty cycle operation.

Digital Twin PBT

Proving hard to beat, the IC-756PRO’sdigital twin PBT shows extraordinarysharpness of cutting in on interfering sig-nals. The twin PBT narrows the IF pass-band in one stage, and efficientlyeliminates any interfering signals limitingdelay in operation. The new digital twinPBT function is especially useful duringcrowded band conditions such as pileups,contests, etc. Of course, the twin PBTconditions, such as tuned value (50 Hzstep), direction, and passband width, areindicated on the LCD for easy recognition.This digital twin PBT will prove to be oneof those most vital functions when huntingfor DX stations.

5-inch TFT color LCD

The first in an HF transceiver! The IC-756PRO is Icom’sprized product, and has adopted a 5-inch TFT color LCD thatoffers a concentrated indication of various information rec-ognizable at a glance. 4 colors and 7 types of fonts can beselected at your personal preference. Separated into anupper and lower screen, the TFT color LCD will be sure tooffer that all important quick operation.

Color TypeType A Type B

Type C Type D

Advanced Features and basics...the Mark of a World Leader

Amber colored indication, easy toread even small characters.

Easy to read even in dark shack.The most useful screen, displays va-riety of information.

Spectrumscope screen(peak-holdfunction ON)

A chic, monochrome indicationscreen.

Example fortransmittingcondition ofrecorded con-tents (T1).

Font typeBasic 1

Basic 2

Pop

7-Segment

Italic 1

Italic 2

Classic

High performance memory keyer

CW operators working long hours will ap-preciate the 4 channel memory keyer. Theentire memory channel contents may beviewed on the display— no need to mem-orize the contents yourself. A maximum of55 characters may be recorded. A serialcontest number auto counter is built in,viewable on the TFT.

Analog and digital meters

Addition to the built-in, large analog S/RFmeter, the IC-756PRO employs a digitalS/RF meter. Output power, ALC level,speech compression level and VSWRratio are simultaneously indicated whiletransmitting, and peak hold function isavailable while signal strength level is in-dicated during receive.

Set mode condition list

All set mode items are classified into 4groups and a maximum of 9 items can beeasily called up onto the display. Settingsare simple and straight forward.

Complete CW features

CW enthusiasts won’t be disappointed. Allof the following capabilities are included inthe IC-756PRO;• Continuously adjustable CW pitch con-

trol, from 300 to 900 Hz• Multi-functional electronic keyer includes

continuously adjustable keying speedand dot/dash ratio, from 7 to 56 wpmand from 2:8:1 to 4:5:1, respectively.

• Double key jacks— one each for frontand rear panels

• Full break-in (QSK) respondence

Superior receive IMD

A 4-element system is employed for re-ceiver mixer circuits, providing superior in-band receive IMD, especially near-byinterfering signals, and a well-designedtriple-conversion system to help minimizeimage and spurious responses for bettersignal fidelity, is also standard.

Dual watch

This function allows you to receive 2 sig-nals on the same band simultaneously.You can conveniently monitor a DX sta-tion while operating on another frequency.To appreciate and fully enjoy HF, the IC-756PRO now makes DXing and huntingfor those rare stations possible, as well asmaking your transceiver respondent tohigh degree contesting.

Memory pad

The memory pad function stores up to 5operating frequencies and modes for easywrite and recall. These memory pads areseparate from the included memory chan-nels, and are convenient especially whenfinding a DX station in a pile-up, or whena station is busy for a long time and youwant to temporarily search for other sta-tions— Use memory pads instead of yourhastily scribbled notes

Other outstanding features

• Triple band stacking register • Quick splitfunction with split lock capability • Built-inantenna tuner covers HF through 50 MHzof amateur bands • AH-4 control circuits• Dial lock • Band edge beep (OFF also se-lectable) • Independent RIT and ∂TX con-trol for each main and sub bands • Dualantenna system • VOX • 2 levels pre-am-plifier and 3 levels attenuator • Auto TSfunction • CI-V interface capability with theoptional CT-17 • Noise blanker • Pro-grammed, Memory, Select memory and∂F scans • 101 memory channels (incl. 2scan edges) with 10-character memorynote • Optional voice synthesizer an-nounces operating frequency, mode, aswell as receiving signal strength • 50 fre-quency tone encoder built-in, and more...

Example forediting amemorychannel 2(M2).

Level settingscreen

Digital meterscreen

• Frequency coverage : Rx 0.030– 60.000 MHz*1, *2

Tx 1.800– 1.999 MHz*2

3.500– 3.999 MHz*2

7.000– 7.300 MHz*2

10.100– 10.150 MHz*2

14.000– 14.350 MHz*2

18.068– 18.168 MHz*2

21.000– 21.450 MHz*2

24.890– 24.990 MHz*2

28.000– 29.700 MHz*2

50.000– 54.000 MHz*2

*1 Some freq. bands are not guaranteed. *2 Depending on version• 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; (50 Ω)]• Temperature range : –10˚C to +50˚C; +14˚F to +122˚F• Frequency stability : Less than ±0.5 ppm (1 min. after pow-

ered ON/0 to 50˚C; +32 to +122˚F)• Frequency resolution : 1 Hz• Power supply requirement : 13.8 V DC ±15% (negative ground)• Power consumption : Tx Max. power 23 A

Rx Standby 3.0 A (typ.)Max. audio 3.5 A (typ.)

• Dimensions : 340(W)×111(H)×285(D) mm;(projections not included) 133⁄8(W)×43⁄8(H)×117⁄32(D) in

• Weight (approx.) : 9.6 kg; 21 lb 1 oz• ACC 1 connector : 8-pin DIN connector• ACC 2 connector : 7-pin DIN connector• CI-V connector : 2-conductor 3.5 (d) mm (1⁄8″)• Display : 5-inch (diagonal) TFT color LCD

• Output power : SSB, CW, RTTY, FM 5–100 W(continuously adjustable) AM 5–40 W

• Modulation system : SSB PSN modulationAM Low power modulationFM Phase modulation

• Spurious emission : 50 dB (HF bands)60 dB (50 MHz band)

• Carrier suppression : 40 dB• Unwanted sideband suppression:

55 dB• ∂TX variable range : ±9.999 kHz• Microphone connector : 8-pin connector (600 Ω)

• ELE-KEY connector : 3-conductor 6.35 (d) mm (1⁄4″)• KEY connector : 3-conductor 6.35 (d) mm (1⁄4″)• SEND connector : Phono (RCA)• ALC connector : Phono (RCA)

• Receive system : Triple conversion superheterodynesystem

• Intermediate frequencies : 1st 64.455 MHz (for all modes)2nd 455 kHz (for all modes)3rd 36 kHz (for all modes)

• Sensitivity (typical) :

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

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

• Selectivity (representative value): SSB, RTTY More than 2.4 kHz/–6 dB(BW: 2.4 kHz) (variable between 50 Hz and 3.6 kHz)

Less than 2.8 kHz/–60 dBCW (BW: 500 Hz) More than 500 Hz/–6 dB

(variable between 50 Hz and 3.6 kHz)Less than 700 Hz/–60 dB

AM (BW: 6 kHz) More than 6.0 kHz/–6 dBLess than 15.0 kHz/–60 dB

FM (BW: 15 kHz) More than 12.0 kHz/–6 dBLess than 20.0 kHz/–60 dB

• Spurious and image : More than 70 dBrejection ratio (except IF through on 50 MHz band)

• AF output power : More than 2.0 W at 10% distortion(at 13.8 V DC) with an 8 Ω load

• RIT variable range : ±9.999 kHz• PHONES connector : 2-pin connector 6.35 (d) mm (1⁄4″)• EXT SP connector : 2-pin connector 3.5 (d) mm (1⁄4″)/8 Ω

• Matching impedance range:16.7–150 Ω unbalanced*1 (HF bands)20–125 Ω unbalanced*2 (50 MHz band)

*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• Insertion loss : Less than 1.0 dB (after tuning)

SPECIFICATIONS

6-9-16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan Phone: 06 6793 5302 Fax: 06 6793 0013 Count on us!

Your local distributor/dealer:

Printed in Japan

Icom Inc. (Japan), is an ISO9001 certificationacquired company.

Certificate Number Q14190

<Corporate Headquarters>2380 116th Avenue N.E., Bellevue, WA 98004, U.S.A.Phone : (425) 454-8155 Fax : (425) 454-1509URL : http://www.icomamerica.com<Customer Service>Phone : (425) 454-7619

Communication EquipmentHimmelgeister Str. 100, D-40225 Düsseldorf, GermanyPhone : 0211 346047 Fax : 0211 333639URL : http://www.icomeurope.com

A.C.N. 006 092 575290-294 Albert Street, Brunswick, Victoria, 3056, AustraliaPhone : 03 9387 0666 Fax : 03 9387 0022URL : http://www.icom.net.au

Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K.Phone : 01227 741741 Fax : 01227 741742URL : http://www.icomuk.co.uk

Zac de la Plaine, Rue Brindejonc des MoulinaisBP 5804, 31505 Toulouse Cedex, FrancePhone : 561 36 03 03 Fax : 561 36 03 00URL : http://www.icom-france.com

Crta. de Gracia a Manresa Km. 14,75008190 Sant Cugat del Valles Barcelona, SPAINPhone : (93) 590 26 70 Fax : (93) 589 04 46URL : http://www.icomspain.com

6F No. 68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C.Phone : (02) 2559 1899 Fax : (02) 2559 1874

3071 #5 Road, Unit 9, Richmond, B.C., V6X 2T4, CanadaPhone : (604) 273-7400 Fax : (604) 273-1900URL : http://www.icomcanada.com

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

00DS0020 © 2000 Icom Inc.

HF/50 MHz ALL MODE TRANSCEIVER

GENERAL

OPTIONS

RECEIVER

TRANSCEIVER

AH-4 HF+50 MHz AUTOMATICANTENNA TUNER

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

AH-2b ANTENNA ELEMENTA 2.5 m long antenna element formobile operation with the AH-4. Allbands between 7–54 can bematched.

CT-17 CI-V LEVELCONVERTER

For remote transceiver controlusing a personal computerequipped with an RS-232C port.You can change frequencies, op-erating mode, etc.

SM-8 DESKTOPMICROPHONE

Electret condenser-type desktopmicrophone including 2 connectioncables for simultaneous connec-tion of 2 transceivers. [UP/DOWN]switches are included.

UT-102 VOICE SYNTHESIZER UNIT

Announces operating frequencyand mode.

SM-20 DESKTOPMICROPHONE

Unidirectional, electret micro-phone for base station operation.[UP/DOWN] switches and a lowcut function are available.

SP-20 EXTERNAL SPEAKER4 audio filters; headphone jack;can connect to 2 transceivers.Input impedance: 8 ΩMax. input power: 5 W

HM-36 HAND MICROPHONESame as that supplied.

ANTENNA TUNER

Supplied accessories:• Hand microphone • DC power cable • Spare fuses • CW key plug

SP-21 EXTERNAL SPEAKERDesigned for base station opera-tion.Input impedance: 8 ΩMax. input power: 5 W

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

Frequency SSB, CW, RTTY AM FMRange (MHz) (at 2.4 kHz BW) (at 6 kHz BW) (at 15 kHz BW)

0.50–1.799 — 13 µV —1.80–27.99 0.16 µV*1 2 µV*1 —28.0–29.99 0.16 µV*1 2 µV*1 0.5 µV*1

50.0–54.0 0.13 µV*2 1 µV 0.32 µV*2

IC-PW1 HF+50 MHz 1 kW LINEAR AMPLIFIERCovers all HF and 50 MHz bands, provides clean, stable 1 kW output. Au-tomatic antenna tuner and compact detachable controller are standard. 2exciter inputs are available.