Quick Installation Guide
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WERA4-Quick-US-200917
Page 59 of 73
The light grey lines in the background show the reference DPT data.
In this example it can be seen that the RMS voltages have all dropped compared to
the reference (from a real measurement after initial installation), but they are linearly
increasing, which looks good.
The phases look very good, too.
Note that only phase values b/-180 degrees are measured.
That is why the phases of channel 11 and 12 in the following plot seem to be shifted.
(See channel 11 in the plot: +140 d140-360= -220 degrees)
For a standard antenna distance of 0.45 lambda the phases between the receive
channels should be around 162 degrees for the DPT signal. But note that due to the
landscape the DPT signal might not be able to travel the shortest route to all antennas
and this will change the phases.
7.6
WERA DPT (Direct Path Test) time series overview (optional)
W
ith the DPT time series of measurements it is possible to retrieve information about
antenna behaviour. Often it is possible to detect a degrading receive antenna before it
fails completely.
Additionally the time series will show, if some of the receive channels are sometimes
overdriven by the TX signal. The RMS voltages of each receive antenna should
always be below 7 V.
For each receive channel plots like these will be available: