13
RF power setting
The RF power level at which the Bluetooth interface operates – and hence the operational range of the BT-1 – is adjustable.
Units are shipped with the power setting at maximum, but in some installation circumstances, it may be desirable to limit the
power of the module, thereby restricting the operational range. Typically, it may be necessary to do this where there are BT-1
modules installed in adjoining rooms, as it reduces the likelihood of the BT-1 in one room appearing in the Device List on
smartphones, tablets, etc., in other rooms.
The power level is set by SW2, SW3 and SW4 on the left-hand DIP switch (as seen from the rear of the module). The three
switches work in a binary manner, thus eight power levels are theoretically available, though this is limited to seven in practice.
The power levels are in 4 dBm steps. The table below lists the available power settings:
LEVEL SW2 SW3 SW4 POWER
1
1 OFF OFF OFF -18 dBm
2 OFF OFF ON -14 dBm
3 OFF ON OFF -10 dBm
4 OFF ON ON -6 dBm
5 ON OFF OFF -2 dBm
6 ON OFF ON +2 dBm
7 ON ON OFF
+6 dBm
8
2
ON ON ON
NOTES:
1. relative to 0 dBm = 1 mW
2. Level 8 is set at the factory as the default
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