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Last modified 2014-02-12

Icom IC-781

A picture of Icom IC-781

SPECIFICATIONS

GENERAL
Type:Amateur HF transceiver
Frequency range:TX: 10-160 m + WARC
RX: 0.1-30 MHz
Tuning steps:10 Hz / 1 KHz
Mode:AM/FM/SSB/CW/RTTY
Channels/memory management:99 regular with notes
2 scan edge
Lithium battery backup (and one separate lithium battery for the clocks)
Repeater shift/offset:? KHz
Power supply:Mains: 100-120 VAC (USA) or 220-240 VAC (Europe, Australia)
Current drain/power consumption:RX: 140-150 VA
TX: 325-760 VA
Antenna impedance/connector:50 ohms (AT off) / SO-239
Dimensions (W*H*D):425*149*411 mm (16.8*5.9*16.2")
Weight:23 Kg (50.7 lbs)
Other features:Monochrome CRT, Spectrum scope. Clock/timer, Notch, CTCSS/PL on
transmit. Twin PBT, NB, Dual watch on the same band, VOX, Built-in
keyer and auto-AT (16.7-150 ohms)




RECEIVER SECTION
Receiver system:Triple conversion superheterodyne (FM)
1st IF: 46.51 MHz
2nd IF: 9.01 MHz
3rd IF: 455 KHz
Quadruple conversion superheterodyne (AM/SSB/CW/RTTY)
1st IF: 46.51 MHz
2nd IF: 9.01 MHz
3rd IF: 455 KHz
4th IF: 10.695 MHz
Sensitivity:AM (10 dB S/N)
0.1-0.5 MHz: 3.2 uV
0.5-1.8 MHz: 6.3 uV
1.8-30 MHz: 1 uV
FM (12 dB SINAD)
28-30 MHz: 0.23 uV
SSB/CW/RTTY (10 dB S/N)
0.1-0.5 MHz: 0.5 uV
0.5-1.8 MHz: 1 uV
1.8-30 MHz: 0.16 uV
Selectivity:AM-W
>6 KHz (-6 dB), <15 KHz (-60 dB)
FM
>15 KHz (-6 dB), <30 KHz (-60 dB)
SSB/CW-W/RTTY-W/AM-N
>2.4 KHz (-6 dB), <3.8 KHz (-60 dB)
CW-N/RTTY-N (CM250Hz Off)
>500 Hz (-6 dB), <1 KHz (-60 dB)
CW-N/RTTY-N (CM250Hz On)
>250 Hz (-6 dB), <800 Hz (-60 dB)
Image rejection:-80 dB
AF output power/speaker:2.6 W at 10% distortion / 8 ohms
External speaker connector:




TRANSMITTER SECTION
RF output power:AM: 8-75 W
SSB: 15-150 W PEP
CW/RTTY/FM: 15-150 W
Modulation system:AM: Low level modulation
FM/RTTY: Reactance modulation
SSB: Balanced modulation
Max FM deviation:5 KHz
Spurious emissions:Less than -60 dB
Microphone connector/impedance:8-pin / 600 ohms




MISCELLANEOUS
Manufactured:Japan, 1987-1993 (Discontinued)
Additional info:New price 1988 in Sweden: 46500:- SEK
Related documents:User manual (6.7 MB)
Modifications:
Options/Accessories:
CT-16
CT-17
HM-36
HP-2
IC-AT500
IC-2KL
SM-6
SM-8
SM-10
UT-36
WR-200
WR-2000
Satellite interface unit
CI-V level converter
Hand microphone with up/down switch
Communication headphones
Automatic antenna tuner, 500 W
Linear amplifier, 500 W
Desk microphone, electret condenser type
Desk microphone with dual line outputs
Desk microphone with compressor & graphic EQ
Voice synthesizer unit
SWR/Power meter, 1.8-150 MHz, 200 W
SWR/Power meter, 1.8-54 MHz, 2000 W