Chapter 6: Configuration and alignment
Aligning antennas
During alignment, the installation tones should exhibit the following behavior:
•
Band scan: When first started up and from time to time, the Master unit will carry out a band
scan to determine which channels are not in use. During this time, between 10 and 15 seconds,
the Master unit will not transmit and as a consequence of this neither will the Slave unit.
During this time the installation tone on the master unit will drop back to the band scan state,
and the Slave unit will drop back to the Scanning state with the pitch of the tone set to the
background noise level. Alignment of the unit should cease during this time.
•
Radar detection: If the unit is operating where mandatory radar avoidance algorithms are
implemented, the ranging behavior may be affected. The Master has to monitor the initially
chosen channel for 60 seconds to make sure it is clear of radar signals before transmitting. If a
radar signal is detected during any of the installation phases, a further compulsory 60 seconds
channel scan will take place as the master unit attempts to locate a new channel that is free of
radar interference.
•
Ranging: The PTP 650 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.
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.
•
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 may take a number of
minutes to establish a link in the Registered state.
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