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 style of our glass bridge displays and accessories.
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
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 |
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