HF/50/144MHz ALL MODE TRANSCEIVER - Icom Australia

HF/50/144MHz ALL MODE TRANSCEIVER

Digital Twin PBT –––––––––––––––––––––––––– 

Only Icom brings you Twin Passband tuning! Tailor 

your IF passband with the Twin PBT by electronically 

shifting the upper and lower IF passbands. Depending 

on the use of the concentric knobs, you can either narrow 

the IF passband, or shift the entire passband to 

eliminate interfering signals. 

Manual Notch Filter –––––––––––––––––––––– 

Interference management is not a problem 

with the Manual Notch filter. With it’s 

incredible 70dB attenuation, the manual 

notch can eliminate a wide variety of 

QRM. The Automatic Notch Filter can 

track two or more interfering signals like 

Heterodynes and “Key uppers”! 

Digital Noise Reduction –––––––––––––––––––– 

By digitally manipulating the incoming signal, the DSP is able to reduce 

various types of noise and enhances the receive signal components. Providing 

an outstanding signal to noise ratio to give clean, clear audio. 

Comparison of receive signal speaker output 

NR OFF 

AGC Loop Management –––––––––––––––––––– 

Another first in this class of transceiver, the IC-7400 incorporates a multiple 

AGC loop management system, which uses the DSP filtering to remove 

unwanted signals from the AGC control. This means, if an 

unwanted signal is removed using the DSP, the AGC will not be affected. 

In other words, “No more 

pumping of the AGC!” 

Also, the AGC is independently 

controllable for mode 

and the time settings. 

(Off, 0.1-6.0 or 8.0 sec.) 

3Lo 

AGC 

455kHz 

36kHz 

NR ON 

Manual 

NOTCH 

Microphone Equalizer –––––––––––––––––––––– 

Bring Hi-Fidelity to the amateur airwaves. The Microphone Equalizer will 

change your RST from “59” to “Great Audio” and “Nice Signal”. Adjust 

your audio for Bass and Treble characteristics to total 121 levels for all 

voice operation. The transmit filter width in SSB mode is selectable from 

2.8/2.4/2.2kHz.The Rx tone control is also an equalizer for the received 

audio. As with the transmit audio, select the amount of Bass and Treble 

you need for the audio clarity you want. 

A/D 

D/A 

Manual Notch Characteristics 

[dB] 20 

0 

–20 

–40 

–60 

–80 

–100 

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

IF 

Filter 

AGC 

DET 

DSP 

D/A 

AF 

32-bit DSP Techn 

Even Higher – To 

Icom has taken the DSP technology 

IC-756PRO series, and created a whole ne 

IC-7400 incorporates the 32-bit DSP feat 

the most flexible signal enhancing, and i 

ever offered in this type of radio. So follow 

the latest features now available in the IC 

Starting with the 32-bit DSP processor and 24-bit AD/DA converter, 

Icom enables the ham radio operator to create the listening 

environment that best suites the current band and operating conditions. 

All Mode Digital Modulation and Demodulation 

Let’s start with the modulation and demodulation of the signals. 

For signal purity and clarity, an all mode digital PSN (Phase Shift 

Network) system has been incorporated into the DSP system. For 

transmit, this greatly reduces the intermodulation distortion, producing 

the highest quality transmit audio. While the PSN separates 

the signal from noise by phasing out noise and other 

unwanted signals. 

IF Filter Shapes 

Next is the IF filters. You will never have to purchase optional 

filters, with over 51 different filter widths, just dial in the width 

you want. Then select whether you want a sharp or soft filter 

shape for SSB and CW modes. For the Digital operators, your 

digital filters are separate from the SSB filters. 

HF/50/144MHz ALL MODE TRANSCEIVER 

Digital RF Speech Compressor –––––––––––––– 

Need more punch in your signal; the Icom Digital RF Speech Compressor 

gives you all you need without fuss and noise. Great for breaking through 

QRM. 

Speech compressor OFF 

Speech compressor ON 

100W 

2.5ms/Div 

2.5ms/Div 

HF + 50MHz + 144MHz All Band Coverage –––––– 

Covering all HF bands as well as 50MHz and 144MHz, the IC-7400 all 

mode transceiver also includes a general coverage receiver from 

0.03–60MHz* and 144–146MHz with full IF DSP capability. 

* Some frequency bands are not guaranteed. 

Continuous Duty at 100W–––––––––––––––––––– 

The bipolar 2SC2694’s are used to provide a clean 100 watts of output 

power for SSB, CW, RTTY and FM modes. (40W in AM). The die-case 

aluminum chassis and the variable speed cooling fan enables the 

IC-7400 to transmit full power all the time*; the perfect companion for 

those digital mode contests. 

* On a 50Ω load at room temperature.

ology Takes You 

144MHz ! 

introduced in the 

w radio category. The 

res to create some of 

terference reduction 

along as we describe 

-7400. 

[dB] 

Soft for CW 

0 

–10 

–20 

–30 

–40 

–50 

–60 

–70 

–80 

–90 

–100 

–800 –600 –400 –200 0 200 400 600 800 

[Hz] 

500Hz 

Soft for SSB 

[dB] 

0 

–10 

–20 

–30 

–40 


–60 

–70 

–80 

–90 

–100 

–3000 –2000 –1000 0 1000 2000 3000 

[Hz] 

2.4kHz 

[dB] 

32-bit Floating Point DSP 

24-bit AD/DA Converter 

Sharp for CW 

0 

–10 

–20 

–30 

–40 


–60 

–70 

–80 

–90 

–100 

–800 –600 –400 –200 0 200 400 600 800 

[Hz] 

500Hz 

Sharp for SSB 

[dB] 

0 

–10 

–20 

–30 

–40 


–60 

–70 

–80 

–90 

–100 

–3000 –2000 –1000 0 1000 2000 3000 

[Hz] 

2.4kHz 

Large, Multi-function LCD –––––––––––––––––– 

The large multi-function LCD displays frequency, 

9-character channel name, channel 

number, multi functional meter 

(includes S-meter, RF output, SWR and 

ALC level) and other operating status. The 

dot-matrix portion of the LCD shows the 

following items: 

• Channel name • Function key assignment • Band Scope • RTTY decoder 

screen • Memory keyer contents • Graphical SWR scale 

RTTY Demodulator and Decoder –––––––––––––– 

The built-in RTTY demodulator and decoder 

reads baudot RTTY signals on the 

screen without turning on your PC or other 

gear. The RTTY tuning indicator helps critical 

tuning. The Twin Peak filter removes 

interfering QRM giving you a more accurate 

decoded message. 

Ample CW Functions –––––––––––––––––––––– 

Multi function electronic keyer, variable dot/dash ratio (2.8:1 to 4.5:1) and 

key speed (6-60 WPM), paddle polarity, bug key etc. CW pitch is adjustable 

(300 to 900Hz). Full break-in capability. Double key jacks – one 

each for front and rear panel. 

Memory Keyer –––––––––––––––––––––––––––– 

4 channel memory keyer stores up to 50 characters with serial contest number 

auto-counter, morse cut number and auto repeat function. In addition, a user 

supplied external keypad* controls the memory keyer from your finger tips. 

* Not supplied by Icom. 

Built-in Antenna Tuner –––––––––––––––––––––– 

The internal antenna tuner matches the HF and 50MHz bands automatically. 

After operating on a band for the first time, the tuner memorizes the 

selected antenna and preset point providing for very high speed tuning. 2 

antenna connectors for HF and 50MHz bands and 1 for 144MHz band is 

equipped on the IC-7400. 

SSB/CW Synchronous Tuning –––––––––––––––– 

You no longer have to worry about losing a CW signal while tuning with 

SSB mode. With the SSB/CW synchronous tuning, the frequency automatically 

shifts when you change modes. 

Mode 

SSB 

CW 

Passband width range 

50–500Hz 

600–3600Hz 

10 types; 50Hz step 

31 types; 100Hz step 

10 types; 50Hz step 

Voice Squelch Control (VSC) function –––––––––– 

The Voice Squelch Control function opens the squelch only when receiving 

a modulated voice signal. 

Other Outstanding Features –––––––––––––––– 

• Triple band stacking register • 2 types of preamplifier (Regular and Higain) 

for HF and 50MHz bands, 1 for 144MHz band • 20dB RF attenuator 

• Level adjustable noise blanker (101 steps) • BPF function below 500Hz 

band width in SSB mode • 1/4 speed dial tuning function for SSB-data, 

CW and RTTY modes • 108 selectable DTCS and 50 selectable CTCSS 

with encoder/decoder • 1750Hz tone encoder • Optional high stability 

crystal unit, CR-338 • Up to 10 memo-pads temporarily store frequencies 

and modes • Quick split function with split lock function • ± 9.99kHz RIT 

and ∂TX • Band edge beep • CI-V capability for PC control • VOX • Program, 

memory, select memory and ∂F scans • IF transmit audio monitor 

(SSB mode only; AF transmit audio monitor for the other modes) • 102 

memory channels • 9600bps data terminal • AH-4 control circuits • Auto 

TS function • Optional voice synthesizer unit, UT-102 announces the operating 

frequency, mode and S-meter level • 1Hz tuning and indication

HF/50/144MHz ALL MODE TRANSCEIVER 

SPECIFICATIONS 

GENERAL 

• Frequency coverage (unit: MHz) : 

Receive 0.030– 60.000* 144.000–146.000 

Transmit 1.800– 1.999* 3.400– 4.099* 

6.900– 7.499* 9.900– 10.499* 

13.900– 14.499* 17.900– 18.499* 

20.900– 21.499* 24.400– 25.099* 

28.000– 29.999* 50.000– 54.000* 

144.000–146.000 

* Some freq. bands are not guaranteed. 

* Covered frequencies depend on version. 

• Mode 

: USB, LSB, CW, RTTY, AM, FM 

• Number of memory Ch. : 102 (99 regular, 2 scan edges and 1 call) 

• Antenna connector : SO-239×3 (2 for HF/50MHz and 1 for 

144MHz bands; 50Ω) 

•Temperature range : –10˚C to +60˚C; +14˚F to +140˚F 

•Frequency stability : 

Less than ±7ppm from 1 min. to 60 min. after power ON. 

After that, rate of stability change is less than ±1ppm at 

25°C (+77°F). Temperature fluctuations (0°C to +50°C; 

+32°F to +122°F) less than ±5ppm. 

• Frequency resolution : 1Hz 

• Power supply requirement: 13.8V DC ±15% 

• Power consumption : Tx Max. power 23A 

Rx Standby 2.2A 

Max. audio 3.0A 

• Dimensions 

: 287(W)×120(H)×316.5(D) mm 

(projections not included) 

•Weight (approx.) : 9.0kg 

• 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″) 

•DATA connector : Mini DIN 6-pin 

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

TRANSMITTER 

• Output power : SSB, CW, RTTY, FM 5–100W 

(continuously adjustable) AM 5–40W 

•Modulation system : SSB PSN modulation 

AM Low power modulation 

FM Phase modulation 

• Spurious emission : Less than –50dB (HF bands) 

Less than –60dB (50/144MHz band) 

• Carrier suppression : More than 40dB 

• Unwanted sideband suppression: 

More than 55dB 

• ∂TX variable range : ±9.99kHz 

• Microphone connector : 8-pin connector (600Ω) 

• 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) 

RECEIVER 

• Receive system : Triple conversion superheterodyne 

system 

• Intermediate frequencies: 1st 64.455MHz 

2nd 455kHz 

3rd 36kHz 

•Sensitivity (typical) : 

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* 1 2µV* 1 — 

28.0–29.99 0.16µV* 1 2µV* 1 0.5µV* 1 

50.0 –54.0 0.13µV* 2 1µV* 2 0.25µV* 2 

144.0–146.0 0.11µV* 3 1µV* 3 0.18µV* 3 

10dB S/N for SSB, CW, RTTY and AM, 12dB SINAD for FM 

* 1 Preamp 1 is ON, * 2 Preamp 2 is ON, * 3 Preamp is ON 

• Squelch sensitivity (Preamp: OFF): 

SSB, CW, RTTY Less than 5.6µV 

FM Less than 1µV 

•Selectivity (representative value): 

SSB (BW: 2.4kHz) More than 2.4kHz/–6dB 

Less than 3.2kHz/–40dB 



CW (BW: 500Hz) More than 500Hz/–6dB 

Less than 700Hz/–60dB 

RTTY (BW: 350Hz) More than 360Hz/–6dB 

Less than 650Hz/–60dB 

AM (BW: 6kHz) More than 6.0kHz/–6dB 


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


• Spurious and image : More than 70dB (HF/50MHz) 

rejection ratio 

More than 60dB (144MHz) 

(except IF through on 50MHz) 

• AF output power : More than 2.0W at 10% distortion 

(at 13.8V DC) 

with an 8Ω load 

• RIT variable range : ±9.99kHz 

• PHONES connector : 3 conductor 6.35 (d) mm ( 1 ⁄4″) 

• EXT SP connector : 2 conductor 3.5 (d) mm ( 1 ⁄8″)/8Ω 

•Matching impedance :16.7–150Ω unbalanced* 1 (HF bands) 

range 

20–125Ω unbalanced* 2 (50MHz band) 

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

• Min. operating input power: 8W (HF bands) 

15W (50MHz band) 

•Tuning accuracy : VSWR 1.5:1 or less 

• Insertion loss 

: Less than 1.0dB (after tuning) 

Supplied accessories: 

•Hand microphone 

• Spare fuses 

ANTENNA TUNER 

• DC power cable 

• CW key plug 

OPTIONS 

IC-PW1/EURO 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. 

AH-4 HF+50MHz AUTOMATIC 

ANTENNA TUNER 

Covers 3.5–54MHz with a 7m (23 

ft) or longer wire antenna. 

AH-2b ANTENNA ELEMENT 

A 2.5m long antenna element for 

mobile operation with the AH-4. 

All amateur bands between 7–54 

MHz can be matched. 

SP-20 EXTERNAL SPEAKER 

4 audio filters; headphone jack; 

can connect to 2 transceivers. 

Input impedance: 8Ω 

Max. input power: 5W 


Style and size are matched to the 

IC-7400. 



CR-338 HIGH STABILITY 

CRYSTAL UNIT 

POC type crystal for improved frequency 

stability. 

Frequency stability: ±0.5 ppm 

HM-36 HAND MICROPHONE 

Same as that supplied. 

PS-125 DC POWER SUPPLY 

Style and size are matched to 

the IC-7400. 

13.8V DC, 25A max. 

SM-20 DESKTOP 

MICROPHONE 

Unidirectional, electret microphone 

for base station operation. 

[UP/DOWN] switches and a low 

cut function are available. 

CT-17 CI-V LEVEL 

CONVERTER 

For remote transceiver control using 

a personal computer equipped with 

an RS-232C port. You can change 

frequencies, operating mode, etc. 

UT-102 VOICE 

SYNTHESIZER UNIT 

Announces operating frequency 

and mode. 


4 audio filters; headphone jack. 



Some options may not be available in some countries. Please ask your dealer for details. 

1-1-32, Kami-minami, 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 

Count on us! 

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 

Your local distributor/dealer: 

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 45804, 

31505 Toulouse Cedex 5, 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 

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 

Ctra. Rubi, No. 88 "Edificio Can Castanyer" 

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 

02YS003D 

© 2002–2007 Icom Inc. 

Printed in Japan

HF/50/144MHz ALL MODE TRANSCEIVER - Icom Australia

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