Compatible antennas

Applicable receivers:  All receivers

It is always recommended that a Trimble tested and compatible Trimble antenna is used with the receivers. You may use other antennas but ensure that these antennas support the correct frequencies enabled on the receiver. Furthermore, check that the gain at the receiver (after accounting for LNA gain and cable loss) is not less than the minimum LNA gain specified for the receiver.

Receiver model	Required signal at the receiver port
BD910	24.5 dB
BD920	28.5 dB
BD930	31 dB
BD935	31 dB
BD940	28 dB
BD960	37 dB
BD970	32.5 dB
BD982	32.5 dB
BD990	32 dB
BD992	32 dB

Switchable antenna filters

In North America, portions of the MSS band may be used for terrestrial communications. To avoid interference, antennas such as the Zephyr 3, AG25, and GA810 have electronically switchable filters. These filters are engaged if the antenna voltage is > 7 V DC. Determination of whether or not to engage these filters are a function of geolocation (currently in North America) and the specified antenna type. Future receiver firmware will update support as regions and supported antennas evolve.

Not all receivers are designed to handle this interaction with switchable antennas. The BD990, BD992, BD992-INS receiver modules, and the BX992 receiver enclosure have this feature. The AX940 and AX940i have this built into their smart antenna. And, modules such as the BD940 receiver module with the antenna power pass through can be set up to drive the antenna with the desired voltage to set the appropriate filtering.

More information

For information about recommended Trimble antennas, go to https://oemgnss.trimble.com/products-solutions/.