iDirect Satellite Router Installation and Commissioning Guide 87iDX Release 3.3Determining the 1 dB Compression Point15.2 Determining the 1 dB Compression PointPerform the 1 dB Compression Point test using the same CW carrier used during the crosspolarization test. This test determines the point at which the Satellite Router’s transmitpower saturates the BUC.If using iSite, perform this procedure in the Adjust Transmit Power section of the CrossPolarization dialog box. If using Web iSite, perform this procedure in the Transmit Powersection of the Cross Polarization page. Both options are shown in Figure 50.Figure 50. Adjusting Transmit Power using iSite and Web iSiteWARNING! To avoid over driving the satellite, the BUC and antenna must be sizedcorrectly for the network.To Determine the 1 dB Compression Point:1. With the access controller observing the transmitted CW signal, increase the TransmitPower in iSite or Web iSite by 1 dBm.WARNING! If no power increase is observed, the BUC may already be saturated.Although this is unusual, it can occur. Reduce power and try again.2. If a 1 dB increase in power is observed, increase the Transmit Power by another 1 dBm.3. Repeat Step 2 until the observed power increase is less than 1 dB.4. Subtract the observed power increase from 1. For example, if power increased by 0.8 dB,the difference is 0.2 dB. Record the difference as “delta.”5. Increase the Transmit Power by 1 dBm. Confirm that the observed power increase is againless than 1 dB from the previous value. Add the difference from 1 to the delta recorded inStep 4.6. Repeat Step 5 until the sum of all differences (delta) is equal to 1.7. Record the Transmit Power setting of the Satellite Router at the point at which deltaequals 1. This is the 1 dB compression point. The Network Operator will enter this valuelater as the Maximum Power for the remote site in iBuilder.
