IC-781

This information is taken directly off of the ICOM IC-781 brochure.

IC-781 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.

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 supression: Less than -40 dB
• Unwanted sideband: Less than -55 dB (with 1 kHz modulation)
• Microphone impedance: 600 ohms

Receiver

• Receive system:

  SSB,CW,AM,RTTY: Quadruple-conversion superheterodyne

  FM: Triple-conversion superheterdyne

• Intermediate frequencies:

  Mode	1st	2nd	3rd	4th
  SSB	46.5115 MHz	9.0115 MHz	455 kHz	10.6950
  CW,RTTY	46.5106 MHz	9.0106 MHz	455 kHz	10.6950
  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 �V

  0.5 ~ 1.8 MHz Less than 1.0 �V

  1.8 ~ 30 MHz Less than 0.16 �V

  AM (for 10 dB S/N):

  0.1 ~ 0.5 MHz Less than 3.2 �V

  0.5 ~ 1.8 MHz Less than 6.3 �V

  1.8 ~ 30.0 MHz Less than 1.0 �V

  FM (for 12 dB SINAD):

  28 ~ 30.0 MHz Less than 0.23 �V

• FM squelch sensitivity: 28 ~ 30 MHz Less than 0.23 �V
• 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

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 fequency: 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)

Back to IC-781 Summary