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IC-7400 

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HF/50MHz/144MHz base station transceiver

The IC-746 achieved a fantastic reputation as a powerful HF base station that gave excellent performance at a competitive price. Well its successor is here: the IC-7400. Covering HF, 50MHz and 144MHz bands, with the same powerful 100W of output power, the IC-7400 carries on the reputation earned by the IC-746, but offers improved performance and a wide range of new features that are destined to set a new benchmark in this important market.

The biggest news of all is that this new transceiver has adopted the same IF DSP as the IC-756PRO and its successor, the IC-756PRO2. ICOM has used a 32-bit floating point DSP and 24-bit AD/DA converter at the heart of the IC-7400, which makes this base station fresh and exciting. Furthermore, the digital IF filter shape is selectable from sharp to soft for both SSB and CW modes. Now let's just see what else this new rig has to offer the demanding Amateur.

32-bit floating point DSP and 24-bit AD/DA converter- The IC-7400 adopts the 32-bit floating point DSP and 24-bit AD/DA converter in the IF stage. This combination dramatically improves the precision and the scale of the signal processing and provides a wide dynamic range from HF to 144MHz band.

Digital IF filter - DSP is used for the IF filters on all bands. This means no optional IF crystal filters are required for bandwidth selection. Fifty-one different passband widths are available according to operator needs from 50Hz to 3600Hz.

Filter Shapes
No optional crystal filters required or needed! 51 built-in, adjustable filters allow for incredible selectivity. The tuning shapes for CW & SSB are independently selectable. You’ve got to try it to believe it!

AGC loop management - Digital IF filter and manual notch are included in the AGC loop controlled by the DSP unit. It rejects blocking by extremely strong adjacent signals out of the filter pass bands. Therefore, you will never suffer from blocking of the AGC gain. In addition, the AGC constants are adjustable for each operating mode (slow, medium, and fast preset).

HF + 50MHz + 144MHz all band coverage - The IC-7400 covers the 1.8MHz to 144MHz amateur bands in all modes (including RTTY). Also the receiver continuously covers from 30kHz to 60MHz and 108-174MHz.*Specifications guaranteed 1.8-29.99, 50-54MHz and 144-148MHz only.

Powerful 100W output for all bands - The IC-7400 generates 100W of RF output power not only for HF and 50MHz, but also for the 144MHz band.

PSN (Phase Shift Network) - All of the modulation and demodulation, including FM and RTTY utilises the DSP unit. Especially in the SSB mode, the PSN generates a very clear and high quality transmit signal. The SSB demodulation reproduces received signals with a high S/N (Signal-to-Noise) Ratio which is 10dB better than that of the IC-746.

Digital twin PBT (Pass Band Tuning) capability - The digital twin PBT actually changes the IF passband. The twin PBT narrows and shifts the IF passband to effectively eliminate interfering signals. This is useful during crowded band conditions such as pileups, or contests etc.

Notch functions - The manual notch function attenuates beat tones. The automatic notch function can eliminate 2 or more interfering signals simultaneously.

Other Features Include:
- Built-in RTTY demodulator
- Digital RF Speech compressor
- Microphone equaliser
- Noise reduction
- Optional CR-338 for high frequency stability
- Memory keyer
- Noise Blanker
- SSB/CW Synchronous Tuning
- Ample functions for CW operators
- Band scope function
- Triple band stacking register
- Tx monitor function
- High contrast, easy to see LCD
- 102 memory channels with 9 character names
- And much, much more.
Specifications

  • Mode: USB, LSB, CW, RTTY, AM, FM

  • USB, LSB, CW, RTTY, FM: 5 - 100W

  • AM: 5 - 40W

  • Number of Memory Channels: 102

  • Dimensions: 287 (w) x 120 (h) x 316.5 (d)mm

  • Weight: 9.0kg

Options

  • AH-2b Mobile whip & bracket (operating with AH-4)

  • AH-4 100 W HF+50 MHz automatic antenna tuner

  • CR-338 High Stability Crystal unit

  • CT-17 CI-V converter

  • HM-36 Hand microphone

  • PS-125 25A Power Supply unit.

  • OPC-025 DC lead

  • SM-20 DESKTOP MICROPHONE
    Unidirectional, electret microphone for base station operation. [UP/DOWN] switches and a low cut function are available.

  • SP-21 Base-station loudspeaker 5W

  • UT-102 Voice synthesiser unit
Automatische Tuner AH-4 CT-17 CI-V Level Converter Breedbandantenne Icom Tafelmicrofoon SM-20 Voeding 220V/13,8V PS-125
AH-4 CT-17 AH-2b SM-20 PS-125
ICOM SP-20 Externe Speaker Filters UT-102 Icom Voice Synthesizer Unit
SP-21 SP-20 Filters UT-102 HM-36
SPECIFICATIONS

 
 GENERAL
Frequency coverage : Rx   0.030 - 60.000 MHz*   144.000 - 146.000 MHz*
  Tx   1.800 -  1.999 MHz*    3.500 -  3.999 MHz*    7.000 -  7.300 MHz*
       10.100 - 10.150 MHz*  14.000 - 14.350 MHz*  18.068 - 18.168 MHz*
       21.000 - 21.450 MHz*  24.890 - 24.990 MHz*  28.000 - 29.700 MHz*
       50.000 - 54.000 MHz*  144.000 - 148.000 MHz*
* Some freq. bands are not guaranteed.
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)
Temp. range : -10°C to +60°C
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 : 1 Hz
Power supply requirement : 13.8 V DC ±15% (negative ground)
Power consumption
: Tx  
  Rx		   Max. power  
  Standby
  Max. audio		   23 A
  2.2 A 
  3.0 A 
Dimensions
 (projections not included)		 : 287(W) × 120(H) × 316.5(D) mm;
  
Weight (approx.) : 9.0 kg
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
 TRANSCEIVER
Output power
 (continuously adjustable)
: SSB, CW, RTTY,
  AM		   FM 5-100 W
  5-40 W
Modulation system : SSB    PSN modulation
  AM      Low power modulation
  FM      Phase modulation
Spurious emission : 50 dB (HF bands)  
  60 dB (50/144 MHz bands)
Carrier suppression : More than 40 dB
Unwanted sideband
suppression		 : More than 55 dB
ΔTX 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)
 RECEIVER
Receive system : Triple conversion superheterodyne system
Intermediate frequencies : 1st 64.455 MHz (for all modes)
  2nd 455 kHz (for all modes)
  3rd 36 kHz (for all modes)
Sensitivity (typical)
: 
Frequency Range
(MHz)		 SSB, CW, RTTY
(at 2.4 kHz BW)		 AM
(at 6 kHz BW)		 FM
(at 15 kHz 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 0.25µV *2
144.0 - 148.0 0.1µV *3 1µV *3 0.1µV *3

10 dB S/N for SSB, CW, RTTY and AM, 12 dB SINAD for FM
*1 Pre-amp 1 is ON,   *2 Pre-amp 2 is ON,  *3 Pre-amp is ON

Squelch sensitivity
 (Pre-amp: OFF)
: SSB, CW, RTTY     
  FM		   Less than 5.6 µV
  Less than 1 µV
Selectivity
 (representative value)
: SSB (BW: 2.4 kHz)



  CW (BW: 500 Hz)

  RTTY (BW: 350 Hz)

  AM (BW: 6 kHz)

  FM (BW: 15 kHz)		   More than 2.4 kHz/-6dB
  Less than 3.2 kHz/-40dB
  Less than 3.6 kHz/-60dB
  Less than 4.3 kHz/-80dB
  More than 500 Hz/-6dB
  Less than 700 Hz/-60dB
  More than 360 Hz/-6dB
  Less than 650 Hz/-60dB
  More than 6.0 kHz/-6dB
  Less than 15.0 kHz/-60dB
  More than 12.0 kHz/-6dB
  Less than 20.0 kHz/-60dB
Spurious and image
rejection ratio		 : More than 70 dB (HF, 50 MHz bands)
  More than 60 dB (144 MHz)
  (except IF through on 50 MHz band)
AF output power
 (at 13.8 V DC)		 : More than 2.0 W at 10% distortion with an 8 Ω load
RIT variable range : ±9.999 kHz
PHONES connector : 3-pin connector 6.35 (d) mm (1/4")
EXT SP connector : 2-pin connector 3.5 (d) mm (1/4") /8 Ω
 ANTENNA TUNER
Matching impedance range : 16.7-150Ω unbalanced*1 (HF bands)
  20-125Ω unbalanced*2 (50 MHz band)
  *1 Less than VSWR 3:1;   *2 Less than VSWR 2.5:1
Min. operating input power : 8 W (HF bands), 15 W (50 MHz band)
Tuning accuracy : VSWR 1.5:1 or less
Insertion loss : Less than 1.0 dB (after tuning)
 

Supplied accessories:

  • Hand microphone
  • DC power cable
  • Spare fuses
  • CW key plug
  • Nederlandstalige handleiding

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

download: Schema (15mB)