MARINE海事对讲机 IC-M422/M421船用甚高频对讲机
 

品牌：ICOM	型号：IC-M422	类型：专业级
频率范围：TX:156.025-157.425 RX:156.050-163.275（MHz）	射频输出功率：25W/1W（W）	理论通讯距离：--（km）
工作电压：13.8V DC ±15%（V）	频率稳定度：±10（ppm）	监听功能：有
外形尺寸：164*78*139.3（mm）	重量：1070（g）

​
发射：156.025 - 157.425MHz
接收：156.050 - 163.275MHz
Usable channels USA, INT, CAN, WX channels
Type of emission  16K0G3E (FM), 16K0G2B (DSC) 
Power supply requirement  13.8V DC ±15%
Current drain (at 13.8V DC)

Tx

Rx
 

5.5A (at 25W output)

1.5A (at AF max.)
 
Operating temp. range –20°C to +60°C,

–4°F to +140°F
 
Antenna impedance 50Ω (SO-239) 
Dimensions

(projections not included)
 164(W) × 78(H) × 139.3(D) mm

615⁄32(W) × 31⁄16(H) × 515⁄32(D)in.
 
Weight (approx.) 1070g; 2.4lb 
NMEA In/out formats  RMC, CGA, GNS, GLL 
Transmitter
Output power 25W, 1W (at 13.8V DC) 
Modulation system  Variable reactance freq. mod. 
Max. freq. deviation ± 5.0kHz
Frequency error ± 10.0ppm (-20°C to +60°C)
Spurious emissions Less than –70dBc
Residual modulation  More than 40dB
Adjacent Ch. power More than 70dB
Audio frequency response +1dB to -3dB of 6dB octave from 300Hz to 2500Hz
Receiver
Intermediate freq.  1st 21.7MHz, 2nd 450kHz
Sensitivity  0.22µV typical at 12dB SINAD
Squelch sensitivity  Less than 0.22uV
Adjacent Ch. selectivity More than 70dB
Spurious response More than 70dB
Intermodulation More than 70dB 
Hum and noise ratio More than 40dB
Audio output power  4.5W typical at 10% distortion with a 4Ω load 
Audio frequency response  +1dB to -3dB of 6dB octave from 300Hz to 2500Hz