RS20S Marine VHF Radio w/ DSC simrad

(the price includes VAT)

Simrad RS20S Class D DSC VHF Radio – The versatile RS20S is ideal for a variety of boats, from small RIBs to larger cruisers, and is designed to match the low profile of the glass bridge displays and accessories.

SKU: RS20S Marine VHF Radio w/ DSC simrad Category:


Stay safe and in touch with this dependable Class D DSC approved VHF radio featuring an integrated GPS receiver.


The versatile RS20S is ideal for a variety of boats from small RIBs to larger cruisers, and is designed to match the low-profile style of our glass bridge displays and accessories.


Key Features

  • High-visibility display with inverted night mode
  • Intuitive rotary dial and keypad controls
  • Four-button fist microphone
  • Class D DSC approved
  • Integrated GPS receiver
  • NMEA 2000® connectivity
  • Dedicated emergency channel key
  • Tri-channel watch function
  • All international channels
  • Easy bracket or flush-mount installation


An Easy to Use Radio for Any Vessel

See clearly in bright daylight with a high contrast black-on-white display, and inverted white-on-black night mode. A rotary dial makes channel selection easy, while large buttons provide quick access to other key functions. Dedicated Channel 16 keys, found on both the radio and its fist microphone, offer instant access to the emergency channel. An included gimbal bracket enables simple table-top, overhead, or bulkhead installation. Flush-mount installation is also possible, with an easy mount-from-front solution, to match the low-profile style of our glass bridge displays and accessories.


Class D DSC Approved

DSC, or “Digital Selective Calling”, makes it easier to stay in touch with other boaters and enables you to broadcast your boat’s location during an emergency. If you find yourself in trouble, the RS20’s dedicated “distress” button will initiate a DSC distress call that sends your boat’s position to anyone within VHF range. Used together with a traditional radio distress call, this makes it easier for other boaters with DSC-capable radios to register your situation and come to your aid. An integrated GPS receiver means your position can be sent even if your boat’s other electronics are powered down.


Easy Access to All International Channels

The RS20S is designed for global use and supports all international channels. With tri-channel watch, easily scan between the current channel, emergency channel 16, and another user-configurable priority channel (in the USA, scan between the current channel, emergency channel 16, and calling channel 9). Alternatively, scan through all available channels or just your selected favourites. Emergency channels can be given priority when scanning to reduce the chance of missing distress calls or other urgent safety messages.

***Minimum product requirements***


Requires a VHF antenna (sold separately). An external GPS antenna may be required in some installations. All DSC functions require an MMSI number issued by local authorities; charges may apply.



Power supply 12 V DC battery system
Nominal operating voltage + 13.6 V DC
Low battery alert 10.5 V DC +/- 0.5 V
Over voltage protection > 15.8 V +/- 0.5 V
Current drain (Transmit) ≤ 6 A @ 25 W / 1.5 A @ 1W (12 V DC)
Current drain (Receive) Less than 450 mA in standby
Replacement Fuse 8 A, Glass type 3 AG; 32 mm (1.25”)
Temperature range -20 ºC to +55 ºC (-4 ºF to 131 ºF)
Usable channels International, USA, Canada, Weather (country specific)
Mode 16K0G3E (FM) / 16K0G2B (DSC)
DSC mode Class D (Global) with dual receiver (individual CH70)
Frequency range (Transmitter) 156.025 – 157.425 MHz
Frequency range (Receiver) 156.050 – 163.275 MHz
Channel spacing 25 KHz
Frequency stability ± 5 ppm
Frequency control PLL


LCD display (viewing) 42 mm x 34 mm (1.65” x 1.3”), FSTN
Contrast control Yes
Backlight control Yes
VHF antenna connector SO-239 (50 ohm)
GPS antenna connector SMA (female)
Waterproof IPx7
Dimensions W=166.7 mm (6.56”) x H=89.2 mm (3.5”) x D=161.4 mm (6.35”) – without bracket
Weight 1.18 kg (2.6 lbs)
Compass safe distance 0.5 m (1.5’)
NMEA 0183 port Yes
NMEA 0183 input RMC, GGA, GLL, GNS
NMEA 0183 output Yes, DSC ( for DSC call), DSE (for enhanced position)
NMEA 2000 port Yes
External speaker support Yes


Flush mount kit Yes
Local/Distant control Yes
Position polling Yes
Group call Yes
Call logs Yes – 20 individual and 10 distress
Channel naming Yes
Tri watch Yes
Favourite channel scan Yes
All scan Yes
User programmable MMSI Yes
MMSI and NAME directory Yes – 20 numbers & group


Frequency error ≤± 1.5 KHz
Output power 25 W (23 ± 2) / 1 W (0.8 ± 0.2)
Transmitter protection Open / short circuit of antenna
Max Frequency deviation ≤± 5
Spurious & harmonics Hi/Lo ≤ 0.25 µ W
Modulation Distortion ±3KHz ≤ 10 % S/N at 3KHz
Deviation ≥ 40 dB
Audio Response at 1KHz +1 to -3dB of 6 dB/octave from 300 hz to 3 KHz
DSC TX deviation at 1.3K 2.6 ± 0.26 KHz
DSC TX deviation at 2.1K 4.2 ± 0.42 KHz
ATIS TX deviation at 1.3 KHz 1.3 ± 0.13 KHz
ATIS TX deviation at 2.1 KHz 2.1 ± 0.21 KHz


12dB SINAD sensitivity 0.25 µV (distant) / 0.8 µV (local)
20db SINAD sensitivity 0.35 µV
Adjacent CH selectivity more than 70 db
Spurious response more than 70 db
Intermodulation rejection more than 68 db
Residual noise level more than -40 db unsquelched
Audio output power 2 W (with 8 ohm at 10% distortion) 4 W (with 4 ohm external speaker)


Receiving frequency 1575.42 MHz
Tracking code C/A code
Number of channels 72 channels
Horizontal accuracy <10 m
Position fixing time Warm start 30s, Cold start 90s
Position update interval 1 second typical


VHF Radio antenna type Dipole. Gain value 6 dBi