The Hemisphere S631 UHF Antenna (QT400-T) broadcasts the S631 on UHF from 410-470 MHz, giving your internal radio a radius of 10 km in ideal conditions.
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The Hemisphere S631 UHF Antenna (QT400-T) allows the S631 to broadcast up to 10 km. The QT400-T has an impressive frequency range of 403-470 MHz- eliminating the need to change antennas. Set-up is easy too; simply screw it into the UHF port on the bottom of the reciever.
The TNC adapter on the QT400-T is compatible with all TNC antenna ports, but also receivers such as the Hemisphere S631 and S320, the Carlson BRx7 and BRx5, the Stonex S900, S850, S990 and S980 families of receivers, and many Topcon, Trimble and Leica receivers. The TNC adapter is perfect for those applications where the antenna must be connected and disconnected regularly as well as remaining snuggly attached to the reciever.
The QT400-T is designed to take the impact of a reciever drop or snag. Rather than breaking the port on the receiver, the antenna is designed to shear, transferring the force to the easily replaceable antenna rather than the internal components of the reciever.
Yes. The QT400-T is listed as compatible with the Hemisphere S631 and Carlson BRX7, along with any receiver that uses a TNC connector antenna. For equipment outside the listed models, it is important to confirm the connector type and supported frequency range before purchase to ensure the antenna is compatible with the radio configuration.
The QT400-T covers the 403-470 MHz range, allowing it to support compatible UHF radio frequencies within that range without requiring a separate antenna for each frequency. The antenna itself is only one part of the radio setup, so the receiver’s radio, configured frequency, and overall system compatibility should also be considered.
When used with a compatible S631 setup, the QT400-T can provide up to 10 km of range in ideal conditions using a 1 Watt internal radio. Actual base-to-rover performance can vary significantly with terrain, obstructions, antenna height, interference, and the way the base and rover are positioned, so the published distance should be treated as an ideal maximum rather than a guaranteed working range.
The QT400-T is a UHF radio antenna, not a GNSS positioning antenna. It supports the receiver’s radio link for transmitting or receiving RTK correction data between compatible base and rover equipment, while GNSS positioning itself is handled by the receiver’s GNSS antenna and board.
The QT400-T uses a sacrificial shear point designed to help protect the receiver when the antenna is subjected to an impact or gets caught during field work. This allows the antenna to break away under excessive force rather than transferring the full load to the receiver’s antenna connection, making replacement easier if damage occurs.
Yes. Compatibility is listed for receivers from manufacturers including Hemisphere, Carlson, Stonex, Topcon, Trimble, and Leica. However, compatibility is not determined by brand alone, so the specific receiver model, UHF frequency range, connector, and radio configuration should be checked before using the antenna with another system.
The required connection depends on the receiver being used. With compatible S631 and BRX7 configurations, the QT400-T connects through the receiver’s UHF antenna connection, while other equipment may require a specific adapter or mounting arrangement. Checking the receiver’s antenna interface before purchase helps avoid compatibility issues in the field.
| Weight | 0.2 kg |
|---|---|
| Dimensions | 31.75 × 40.64 × 4 cm |
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