LTE交流资料(2)(2)

Unit: 1 % Resolution: 1

Takes effect: Immediately.

It is possible to activate VSWR Antenna Supervision on all RF ports supporting measurements of reflected radio power in the RU. Supervision can be made on Radio Frequency (RF) ports used for downlink where power is transmitted. VSWR supervision is only possible on a Transmitter (TX) branch.

Supervision sensitivity can be set to reduce false alarms and to avoid reflected power becoming too low due to the attenuation in a long feeder cable.

lists the VSWR values based on the following formula: VSWR = (1+10^(-RL/20))/(1-10^(-RL/20)) Where RL is return loss.

Table 1 VSWR Calculation

VSWR Sensitivity [%] ReturnLoss threshold

[dB] 0 10 20 30 40 50 60 70 80 90 100

VSWR 3.00 2.68 2.22 2.42 2.06 1.92 1.81 1.71 1.63 1.56 1.49

6 6.8 7.6 8.4 9.2 10 10.8 11.6 12.4 13.2 14

4，RRUL81如下来看

我们可以“ lh ru psv”看“returnLoss”！

0002BXP_3_1: ch3: txpwr(-27.071273) torPwr(-27.793604) rxPwr(-42.022749) returnLoss(128) ---------128标示-12.8db，对应下表1.59之间