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Last modified 2025-05-29

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Uniden UM-425 VHF DSC

A picture of Uniden UM-425 VHF DSC

SPECIFICATIONS

GENERAL
Type:Marine VHF transceiver
Frequency range: TX: 156.025-157.425 MHz
RX: 156.050-162.000 MHz
Tuning steps:Channelized
Frequency stability:±1.5 KHz @ -15 to +55°C (5 to 131°F)
Mode:FM
Channels / memory management: International, US and Canadian channels
Duplex shift / offset:Automatic according to bandplan
Power supply:10.8-15.6 VDC
Current drain / power consumption:RX: 0.4-1 A
TX: Max 6 A
Antenna impedance / connector:50 ohm / SO-239
Dimensions (W*H*D):162*67*128 mm (6.4*2.62*5.04"), without heatsink
Weight:930 g (2.05 lb)
Other features: Class D DSC. Channel 16/9 button. PA. Dual/triwatch. Scanning.
GPS option (NMEA0183).




RECEIVER SECTION
Receiver system: Double conversion superheterodyne
1st IF: 41.925 MHz (Com) - 21.7 MHz (DSC)
2nd IF: 455 KHz
Sensitivity:0.25 uV (12 dB SINAD)
Squelch sensitivity:0.2 uV (Threshold)
Selectivity:78 dB (Adjacent channel)
Image rejection:
AF output power / speaker:2.5 W at 10% distortion / 8 ohm
External speaker connector:




TRANSMITTER SECTION
RF output power: High: 25 W
Low: 1 W
Modulation system:
Max FM deviation (Factory set):±5 KHz
Spurious emissions:Better than -45 dBm @ 25 W
Microphone impedance / connector:2 Kohm / Fixed spiral cord
Microphone input level:? mV




MISCELLANEOUS
Manufactured:China, 2011-20xx (Discontinued)
Additional info:
Related documents:User manual (2.9 MB)
Modifications and fixes:
Reviews:
Options / Accessories:
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