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IC-756 - HF/6m Base Transceiver

 

Quick Specs:
HF/6 meter base transceiver
RX: 0.03-60.0 MHz
TX: all amateur HF bands + 6 meter band
Output power: 100 W (40 W AM)
Modes: CW, SSB, AM, FM, RTTY
Receiver sensitivity: see detailed specifications

 
Detailed Specifications

GENERAL

  • Frequency Coverage:
    Receive: 0.030 - 60.000 MHz *1
    Transmit:
    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 frequency bands are not guaranteed
    *2 Depending on version
  • Mode: USB, LSB, CW, RTTY, AM, FM
  • Number of Memory Channels: 101 (99 regular, 2 scan edges)
  • Antenna Connector: PL-239x2 and phono [(RCA); 50 ohms]
  • Usable Temperature Range: -10°C to +60°C; +14°F to +140°F
  • Frequency Stability: Less than ±200 Hz from 1 min. to 60 min. after power ON. After that, the rate of stability change is less than ±30 Hz/hr at +25°C; +77°F. Temperature fluctuations 0 °C to +50°C (+32°F to + 122°F) less than ±350Hz.
  • Frequency Resolution: 1 Hz
  • Power Supply Requirement: 13.8 V ±15% (negative ground)
  • Current Consumption:
    • Transmit max. power: 20A
    • Receive standby: 2.5A
    • max. audio: 2.7A
  • Dimensions: 340(W) x 111(H) x 285(D) mm, 13.37(W) x 4.37(H) x 11.22(D) in (projections not included)
  • Weight: 10.5 kg; 23.1 lb.
  • CI-V Connector: 2-conductor 3.5(d) mm (1/8")

Transmitter

  • Output Power:
    SSB/CW/RTTY/FM: 2-100 W
    AM: 1-40 W
  • Modulation System:
    SSB, AM: PSN modulation
    FM: Variable reactance modulation
  • Spurious Emissions: 50 dB (HF bands), 60 dB(50MHz bands)
  • Carrier Suppression: 40 dB
  • Unwanted Sideband Suppression: 55 dB
  • Delta TX Variable Range: ±9.999 kHz
  • Microphone Connector: 8-pin connector (600 ohms)
  • 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

  • Sensitivity:
    SSB, CW, RTTY - 0.16 µV (1.80-29.99 MHz)*1
    (10 dB S/N) - 0.13 µV (50.0-54.0 MHz)*2
    AM - 13 µV (0.5-1.799 MHz)
    (10 dB S/N) - 2 µV (1.80-29.99 MHz)*1
    FM - 0.5 µV (28.0-29.99 MHz)*1
    (12 dB SINAD) 0.32 µV (50.0-54.0 MHz)*2
    *1 Pre-amp 1 ON, *2Pre-amp 2 ON
  • Squelch Sensitivity (threshold):
    SSB, CW, RTTY - Less than 5.6 µV
    FM - Less than 1.0 µV
  • Selectivity:
    SSB, CW, RTTY - More than 2.4 kHz/-6 dB ; Less than 3.8 kHz/-60 dB
    AM - More than 9.0 kHz/-6 dB ; Less than 20 kHz/-60 dB
    FM - More than 12 kHz/-6 dB ; Less than 30 kHz/-60 dB
  • Spurious and Image Rejection Ratio: More than 70 dB (except IF through in 50 MHz band)
  • Delta RIT Variable Range: ±9.999 kHz
  • Audio Output Power (at 13.8 V DC): More than 2.0 W at 10% distortion with an 8 ohm load
  • PHONES Connector: 3-conductor 6.35 (d) mm (1/4")
  • EXT SP Connector: 2-conductor 3.5 (d) mm (1/8") 8 ohms

Antenna Tuner

  • Matching Impedance Range:
    • HF Bands: 16.7 to 150 ohms unbalanced *1
    • 50 MHz band: 20 to 125 ohms unbalanced *2
    • *1 Less than VSWR 3:1; *2Less than VSWR 2.5:1
  • Minimum Operating Input Power:
    • HF bands: 8 W
    • 50 MHz band: 15 W
  • Tuning Accuracy: VSWR 1.5:1 or less
  • Insertion Loss (after tuning): Less than 1.0 dB

IC-756 Options

Linear Amplifiers

  • IC-4KL HF 1 kW LINEAR AMPLIFIER: This is an all solid-state, full-duty 1 kW linear amplifier including an automatic antenna tuner. The IC-4KL is fully controllable from the IC-756. No need to tune and no need to switch the operating band. Full break-in (QSK) operation is possible. The amplifier/power supply unit and the remote control unit are separated.
  • IC-2KL HF 500 W LINEAR AMPLIFIER: All solid state linear amplifier. The power amplifier unit can be separately set up from the power supply unit.

Automatic Antenna Tuners, Antenna Element and Antenna Selector

  • IC-AT500 HF 500 W AUTOMATIC ANTENNA TUNER: Includes automatic antenna selector for 4 separate antennas.
  • AH-3 100 W HF AUTOMATIC ANTENNA TUNER: Weather-proof tuner matches the IC-756 to a long wire antenna for outdoor set up.
  • AH-2b Antenna Element: A 2.5 m long antenna for mobile operation with the AH-3. All bands between 3.5 to 29.7 MHz can be matched.
  • EX-627 AUTOMATIC ANTENNA SELECTOR: Automatically selects the antenna for the selected ham band. Manual selection is also possible. Max input power: 1000 W PEP

DC Power Supplies

  • PS-85 DC POWER SUPPLY: Output: 13.8 V DC (20 A max.)

External Speakers

  • SP-20 EXTERNAL SPEAKER: 4 audio filters; headphone jack; can connect to 2 transceivers. Input impedance: 8 ohms; Max input power: 5 W
  • SP-21 EXTERNAL SPEAKER: Designed for base station operation. Input impedance: 8 ohms; Max input power: 5 W

Microphones

  • SM-8 DESKTOP MICROPHONE: Electret condenser-type desktop microphone including 2 connection cables for simultaneous connection of 2 transceivers. [Up/Down] switches are included.
  • SM-20 DESKTOP MICROPHONE: Unidirectional, electret microphone for base station operation. Includes [Up]/[Down] switches and a low cut function.

Internal Units and Filters

  • FL-100, FL-101, FL-223, and FL-232 9 MHz FILTERS: Have good shape factor and provide you with better reception.
    FL-100: 500 Hz/-6 dB (CW/RTTY nar.)
    FL-101: 250 Hz/-6 dB (CW nar.)
    FL-223: 1.9 kHz/-6 dB (SSB nar.)
    FL-232: 350 kHz/-6 db (RTTY, CW nar.)
  • FL-52A, FL-53A, FL-222, and FL-257 455 kHz FILTERS: Have good shape factor and provide you with better reception.
    FL-52A: 500 Hz/-6 dB (CW/RTTY nar.)
    FL-53A: 250 Hz/-6 dB (CW nar.)
    FL-222: 1.8 kHz/-6 dB (SSB nar.)
    FL-257: 3.3 kHz/-6 db (SSB wide)

Others

  • CT-16 SATELLITE INTERFACE UNIT: Easy tuning when connecting another Icom VHF transceiver for instant satellite communications.
  • 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, memory channels, etc.
  • UT-102 VOICE SYNTHESIZER UNIT: Announces operating frequency and mode.
  • CR-502 HIGH-STABILITY CRYSTAL UNIT: Contains a temperature-compensating oven heater and crystal unit for improved frequency stability. Frequency stability: ± 0.5 ppm.
 
 
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