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IC-781 - HF Base Transceiver | Radioaficion Ham Radio

IC-781 - HF Base Transceiver

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ICOM IC-781 - HF Base Transceiver

Manufactured: Japan, 1987-1993 (Discontinued)

ICOM IC-781 - HF Base Transceiver

Once in a lifetime, a transceiver is introduced thaf s so extraordinary and innovative that it opens a totally new era in HF communications. ICOM's pacesetting IC-781 proudly exhibits that hallmark achievement with futuristic designs and features of true legendary proportions. Whether DX'ing, contesting, pioneering new interests or enjoying unquestionable top-of-the-line performance, the IC-781 is indeed today's standard of excellence!

Multi-Function Rve Inch CRl Displays frequencies, modes, memory contents, operating notes, RIT, two menu screens, plus a panofamlc view of all signals in a selected range, A portion of the screen also serves as a display for data modes like RTTY AMTOR, and PACKET,

Unique Spectrum Scope. Continuously indicates all signal activities and DX pileups with your operating frequency in the center Selectable horizontal frequency spans of 50,

100, and 200KHz for each skje of the frequency you're listening to. Vertical range indicates relative signal strengths, A contested dream!

Dual Width Noise Blanker includes MCF filter plus level and width controls to eliminate pulse and woodpecker noise with minimum adjocent-signal interference.

Incomparable Filter Flexibility.

Independent selection of wide and narrow SSB filters plus CW filters. Second and third CW IF filters are Independently selectable!

Dual Watch. Simultaneously receives two frequencies in the same band! Balance control adjusts VFO A/B receive strength levels. You can check additional band activity, even tune in your next contact, while in QSO without missing a single word!

DX Rated! 150 watts of exceptionally clean RF output, Easily drives big amplifiers to maximum power

Twin Passband Tuning with separate controls for second and third IF stages!

Increases selectivity and narrows bandwidth, independently varies low and high frequency response, or functions as IF shift. It's DX'ing Dynamite!

A Total Communications System)

Includes built-in 100% duty AC supply, high speed automatic antenna tuner, iambic keyer, semi-automatic or full QSK CW break-in to 60 wpm, Audio Peaking filter (APR, RF speech processor, multiscannmg. 105db dynamic range, all-band/all-mode receiver with general coverage, and much more!

ICOM Dependability. The phenomenal IC-781 Is built for action and backed with the most extensive warranty in the industry.

Quick Specs:
HF base transceiver
RX: 0.1-30.0 MHz
TX: all amateur HF bands
Output power: 150 W (75 W AM)
Modes: CW, SSB, AM, FM, RTTY
Receiver sensitivity: see the table in the detailed specifications


Detailed Specifications

General

  • Frequency Coverage:
    • Receive:
      • 0.1 ~ 30.0 MHz
      • guaranteed range 500 kHz ~ 30 MHz
    • Transmit:
      • 160-m band 1.8 ~ 2.0 MHz
      • 80-m band 3.5 ~ 4.0 MHz
      • 40-m band 7.0 ~ 7.3 MHz
      • 30-m band 10.1 ~ 10.15 MHz
      • 20-m band 14.0 ~ 14.35 MHz
      • 17-m band 18.068 ~ 18.168 MHz
      • 15-m band 21.0 ~ 21.45 MHz
      • 12-m band 24.89 ~ 24.99 MHz
      • 10-m band 28.0 ~ 29.7 MHz
  • Modes: A3J (SSB),A1 (CW),F3 (FM), F1 (RTTY), A3 (AM)
  • Frequency step: 10 Hz (with [TS] OFF); 1 Hz (with [TS] ON)
  • Antenna impedance (with [TUNER] OFF): 50 ohms (unbalanced)
  • Power Supply Requirement: 100 ~ 120 V AC (U.S.A. version); 220 ~ 240 V AC (Australia, Europe, France versions)
  • Power consumption:
    • Receiving maximum. audio: 150 VA; standby: 140 VA
    • Transmitting maximum.: 760 VA; minimum: 325 VA
  • Usable Temperature Range: -10°C to +60°C; +14°F to +140°F
  • Frequency stability: ±15 Hz (-10°C to +60°C; +14°F to +140°F)
  • Dimensions: 425(W) x 149(H) x 411(D) mm, 16.7(W) x 5.9(H) x 16.2(D) in
  • Weight: 23 kg; 50.7 lb.

Receiver

  • Receive system:
    • SSB, CW, AM, RTTY: Quadruple-conversion superheterodyne
    • FM: Triple-conversion superheterodyne
  • Intermediate frequencies:
    Mode 1st 2nd 3rd 4th
    SSB 46.5115 MHz 9.0115 MHz 455 kHz 10.6950 KHz
    CW, RTTY 46.5106 MHz 9.0106 MHz 455 kHz 10.6950 KHz
    AM 46.5100 MHz 9.0100 MHz 455 kHz 10.6950 MHz
    FM 46.5100 MHz 9.0100 MHz 455 kHz -
  • Sensitivity (preamp ON):
    • SSB, CW, RTTY (for 10 dB S/N):
      • 0.1 ~ 0.5 MHz Less than 0.5 µV
      • 0.5 ~ 1.8 MHz Less than 1.0 µV
      • 1.8 ~ 30 MHz Less than 0.16 µV
    • AM (for 10 dB S/N):
      • 0.1 ~ 0.5 MHz Less than 3.2 µV
      • 0.5 ~ 1.8 MHz Less than 6.3 µV
      • 1.8 ~ 30.0 MHz Less than 1.0 µV
    • FM (for 12 dB SINAD):
      • 28 ~ 30.0 MHz Less than 0.23 µV
  • FM squelch sensitivity: 28 ~ 30 MHz Less than 0.23 µV
  • Selectivity:
    • SSB, CW-W, RTTY-W, AM-N: More than 2.4 kHz/-6 dB ; Less than 3.8 kHz/-60 dB
    • CW-N, RTTY-N (with [CW250Hz] OFF): More than 500 kHz/-6 dB; Less than 1 kHz/-60 dB
    • CW-N, RTTY-N (with [CW250Hz] ON): More than 250 kHz/-6 dB; Less than 800 kHz/-60 dB
    • AM-W: More than 6.0 kHz/-6 dB ; Less than 15.0 kHz/-60 dB
    • FM: More than 15.0 kHz/-6 dB ; Less than 30.0 kHz/-50 dB
  • Spurious and image rejection ratio:
    • Image: Less than -80 dB
    • IF: Less than -70 dB
  • Audio output: More than 2.6 W with an 8 ohm load at 10% distortion
  • Notch filter attenuation: More than 45 dB
  • RIT variable range: ±9.99 kHz

Transmitter

  • Maximum output power:
    • SSB: 150 W PEP
    • CW, RTTY, FM: 150 W
    • AM: 75 W
  • Modulation system:
    • SSB: balanced modulation
    • FM, RTTY: reactance frequency modulation
    • AM: low level modulation
  • Maximum frequency deviation: ±5 kHz
  • RTTY shift width: 170 Hz, 425 Hz, 850 Hz selectable
  • Spurious emissions: Less than -60 dB
  • Carrier suppression: Less than -40 dB
  • Unwanted sideband: Less than -55 dB (with 1 kHz modulation)
  • Microphone impedance: 600 ohms

Antenna Tuner

  • Output matching range: 16.7 ~150 ohms unbalanced
  • Minimum input power: 15 W
  • Auto tuning accuracy: VSWR less than 1.2:1
  • Insertion loss: Less than 0.5 dB (after tuning)

CRT Display

  • Output level:
  • Composite video signal: 1 Vp-p
  • Video components: 0.7 Vp-p positive
  • Synchronous components: 0.3 Vp-p negative
  • Output impedance: 75 ohms
  • Horizontal frequency: 15.75 kHz
  • Vertical frequency: 60 Hz

IC-781 Options

  • IC-4KL 1 kW HF LINEAR AMPLIFIER
  • IC-2KL 500 W HF LINEAR AMPLIFIER
  • IC-AT500 500 W AUTOMATIC ANTENNA TUNER
  • SP-20 EXTERNAL SPEAKER WITH AUDIO FILTERS (8 ohms/5 W)
  • SM-6 DESKTOP MICROPHONE
  • SM-8 DESKTOP MICROPHONE
  • SM-20 DESKTOP MICROPHONE
  • HM-12 HAND MICROPHONE (includes UP/DOWN switches)
  • UT-36 VOICE SYNTHESIZER UNIT
  • CT-16 SATELLITE INTERFACE UNIT
  • CT-17 CI-V LEVEL CONVERTER
  • EX-627 HF AUTOMATIC ANTENNA SELECTOR
  • FL-103 SSB WIDE FILTER (9.0115 MHz, 2.8 kHz/-6 dB)

Related documents:

Icom IC-781 User manual

IC-781 & R9000 LCD Installation

SERVICE MANUAL

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