The Sokkia R4S-BT is a compact, rugged external UHF radio modem designed to expand the communication range of your RTK GNSS system, especially when used with the Sokkia GCX3 receiver line. Featuring built-in Bluetooth® 4.1 connectivity, internal battery power, and full IP67 protection, the R4S-BT delivers wireless freedom and long-lasting performance for demanding field conditions.

This modem is ideal for extending base-to-rover communication up to a full mile in environments where cellular or network coverage is unreliable or unavailable. Whether you’re converting a SiteComm rover into a full UHF rover or building an affordable base-rover solution, the R4S-BT offers flexible, field-ready functionality with fast setup and low power consumption.

Features:

• UHF multichannel radio modem with up to 70 MHz

• Dust, water, and harsh conditions are no match with the R4S-BT’s IP67 cover and rugged design.

• Wireless data transfer via Bluetooth™

• Battery 7200mAh (type 18650)

• IP67 class power and data connector

• Size/Weight 165 x 52 x 52 mm/420g

• Standard kit includes 1x RS4-BT Radio, Antenna, Pole Bracket, Programming/Power Cables, Softcase

Extend your range:

The R4S-BT combines a UHF radio modem, Bluetooth, and an internal battery all together in a rugged IP67 classified housing. If you need to extend the communication radio range between between your RTK base station and rover, the R4S-BT is a perfect fit.

Get more out of your existing equipment:

If you already have a GCX3 but find yourself on a bigger job site or without a clear line-of-sight, you’re now able to extend the range from 300 m up to a mile. Even if you have a third-party GNSS receiver, our open architecture lets you easily adapt the R4S-BT into your workflow and create a modular solution. Easily upgrade your SiteComm rover into UHF rover.

Stay connected:

The R4S-BT is perfect in situations without a network connection, or where network or cellular connections are poor. Simply add on this external UHF radio and extend the range between the base and rover.

Ready for the field:

With an IP67 certification, the R4S-BT is ready to tackle even the toughest jobs. The housing is water and dustproof for rough outdoor conditions.

Stay charged:

The 7200 mAh battery lets you get more done on the job without the need to recharge during the workday. You can get up to 20 hours in receive mode and 6 hours in transmit mode at 1 W.

Light and versatile:

Even though it’s built to withstand the harshest of environments, weighing in at only 420 g, the R4S-BT is light and easy to carry and mount. The R4S-BT also offers flexible mounting options to help adapt to your needs in the field.