Below the antenna pointing, the ACU shows the actual beacon level. The level value shown is that one read by the ODM from the analog input. This value may differ from the level reported by the beacon receiver directly. There is also a strip chart display of the level. The chart moves with the same speed as the angle charts above, so you directly can watch the influence of tracking steps to the beacon level. A click with the right mouse button into the chart shows a pop-up menu for scales and other display options.
The screen also provides fields to set common parameters of the beacon receiver like the receive frequency and polarization, bandwidth parameters and the frequency tracking option. Changing the values in these fields changes the beacon receiver setting immediately.
The threshold value contained in this parameter group is the ACU/ODM level threshold rather than the threshold parameter of the beacon receiver itself. The latter is recommended to be set to a very low value in order to avoid level fault messages from the beacon receiver. The beacon level threshold is to be monitored by the ACU/ODM, hence the level fault can be synchronized with the tracking activities.
The frequency offset display in this group reports the activity of the beacon receiver's frequency track facility, the small yellow lamp is lit while a frequency track cycle is in progress