Fast Gain Ranging

You can set a rough gain very quickly and adjust to an exact gain slightly later by using fine gain ranging and coarse gain ranging together. The benefits of using fine gain ranging and coarse gain ranging are described in the following table.

Table 3. Fine Gain Ranging and Coarse Gain Ranging
Type Implementation Gain Configuration Time to Apply Gain (Typical) Receiving and Transmitting Support
Fine Gain Ranging Using peer-to-peer (P2P) packets Any arbitrary gain 3 μs to 5 μs, depending on other P2P traffic in the system Simultaneously or one at a time
Coarse Gain Ranging Using two PXI triggers One of four values <2 μs One at a time
Note Fast gain ranging features use PXI trigger lines. Ensure that you are using the Route Triggers Gain Ranging VI or that you have manually reserved the specified triggers. If trigger writer and trigger reader modules are not in the same PXI trigger bus, ensure that the trigger lines are routed between buses.

To learn more about using the fast gain ranging feature, open the NI mmWave Reference Project at <NIDIR>\LabVIEW<Year>\examples\instr\niMmWave\niMmWave Reference Project\niMmWave Reference Project.lvproj and select the Gain Ranging Example VI from the Project Explorer window.

Note Once gain ranging is enabled for the receiver scope, you must disable gain ranging before changing any non-gain ranging configurations for the receiver scope. The same is independently true for the transmitter scope.