SonTek RS5 User Manual (August 2020) 36
Please see Appendix D for detailed instructions on how to enable an external
GNSS/GPS antenna for the first time.
The external GNSS/GPS antenna must supply its own power. Please follow the antenna
manufacturer’s instructions on how to power their system.
5.3. Secure RS5 in Hydroboard II – Micro
Once the RS5 system is powered put the system in the Hydroboard II – Micro hole and
secure the bracket. Make sure that the RS5 heads is further than the bottom of the
board to ensure that the transducers remain in the water (Figure 11).
Figure 11. Installing the RS5 in the HBII-Micro: Ensure that the RS5 head extends further than the bottom of
the board.
5.4. Connect Bluetooth Radio Antenna
There are two options to install the Bluetooth radio antenna on the RS5 unit: directly
attached to the RS5 (no GNSS antenna) or elevated (with GNSS antenna on mount).
Extensive testing has shown that elevating the Bluetooth antenna above the GNSS
antenna drastically improves communications if a GNSS antenna is used. Figure 12
shows what the two configurations look like. If mounting the Bluetooth antenna above
the GNSS, the radio extension cable is required (shown in Figure 2). The extension
cable can be used even without a GNSS antenna if desired.