Dvm Alignment; Figure 34 - Using Dvm For Alignment - Motorola PTP 300 Series User Manual

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Ranging: The PTP 300 Series does not require the user to enter the link range. The
Master unit typically takes less than 60 seconds to determine the length of the link being
installed. The Master unit will remain in the Scanning state until the range of the link has
been established. The Master unit will only move to the Synchronized state when the
range of the link has been established.
•
Retrying same channel: If, at the end of the ranging period, the Registered state is not
achieved due to interference or other reasons, the Master unit will retry twice more on the
same channel before moving to another available channel. Should this occur it might take
a number of minutes to establish a link in the Registered state.
•
Slave unit: The Slave unit does not have a ranging process. The slave unit will change to
the Synchronized state as soon as the wanted signal is demodulated.

6.6.3 DVM Alignment

It is possible to use the BNC connector on the PTP 300 Series ODU and a digital voltmeter
(DVM) to help with the alignment process. The BNC connector provides an analogue voltage
which is proportional to the receive signal strength. To use, remove the protective cap from
the case mounted BNC connector and connect a DVM. You may have to invert the pole for
correct reading. Figure 34 shows the relationship between measured values and the receive
signal strength.
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Figure 34 - Using DVM For Alignment

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6 Installation