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Last modified 2023-09-18

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Icom IC-681

A picture of Icom IC-681

SPECIFICATIONS

GENERAL
Type:Amateur VHF transceiver
Frequency range: Japanese domestic market
TX: 50-54 MHz
RX: 50-54 MHz
Tuning steps:5 / 10 / 12.5 / 15 / / 20 / 25 / 30 / 50 KHz
Frequency stability:10 ppm @ -10 to +60C (14 to 140F)
Mode:FM
Channels / memory management: 100 regular
1 call
3 scan edge pairs
Repeater shift / offset:?
Power supply:13.8 VDC 15%
Current drain / power consumption:RX: 0.8 to 1 A
TX: 1.5 to 3.8 A
Antenna impedance / connector:50 ohm / SO-239 (On pigtail)
Dimensions (W*H*D):140*40*132 mm (5.51*1.58*5.2")
Weight:800 g (1.76 lb)
Other features:Dimmer. 1200/9600 bd packet jack.




RECEIVER SECTION
Receiver system: Double conversion superheterodyne
1st IF: 10.7 MHz
2nd IF: 450 KHz
Sensitivity:0.16 uV (12 dB SINAD)
Selectivity:15 KHz (-6 dB)
30 KHz (-60 dB)
Image rejection:60 dB
AF output power / speaker:2.4 W at 10% distortion / 8 ohm
External speaker connector:




TRANSMITTER SECTION
RF output power:

HighLow 2Low 1
6 m:10 W3 W500 mW
Modulation system:Variable reactance frequency modulation
Max FM deviation (Factory set):5 KHz
Spurious emissions:Better than -60 dB
Microphone impedance / connector:600 ohm / 8-pin modular
Microphone input level:? mV




MISCELLANEOUS
Manufactured:Japan, 1995-199x (Discontinued)
Additional info:
Related documents:
Modifications and fixes:
Reviews:
Options / Accessories:
HM-77
HM-78
MB-17A
SP-7
SP-12
UT-85
Hand microphone with DTMF pad
Standard hand microphone (As supplied)
Mobile mounting bracket
External speaker
External speaker
Tone squelch unit (CTCSS/PL encoder/decoder + tone scan)