User's Guide Part 2

User Guide: PTP 600 Series Establishing a radio link
phn-0896_009v003
Feb 2010
UNDER DEVELOPMENT
5-61
Behaviour during alignment
When the units are powered up and alignment begins, the following behavior may be
observed:
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 behaviour for the PTP 600 Series 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 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 Master unit can take up to 60 seconds in 0-40 km (0-25 miles) mode, 90 seconds in
0-130 km (0-81 miles) mode and 120 seconds in 0-200 km (0-124 miles) mode to
determine the range 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.