Operational Restrictions; Radar Avoidance - Motorola PTP 300 series User Manual

5.3 Operational Restrictions

5.3.1 Radar Avoidance

Radar Avoidance requires that equipment used in the region:
Detects interference from other systems and avoids co-channel operation with these systems,
notably radar systems.
Provide on aggregate a uniform loading of the spectrum across all devices, i.e. Fixed Frequency
operation is not allowed.
To address the primary aims the Spectrum Management algorithm implements a radar detection
function which looks for impulsive interference on the active channel only. If impulsive interference
is detected Spectrum Management will mark the current active channel as having detected radar
and initiate a channel hop to an available channel. The previous active channel will remain in the
radar detected state for thirty minutes after the last impulsive interference pulse was detected.
After the thirty minutes have expired the channel will be returned to the available channel pool.
The radar detection algorithm will always scan the active channel for 60 seconds for radar interfer-
ence before using the channel. This compulsory channel scan will mean that there is a 60 seconds
service outage every time radar is detected and that the installation time is extended by 60 seconds
even if there is found to be no radar on the channel.
NOTE: On system installation or start-up this extends the initial scan time of the Master unit
by 60 seconds. To address the "provide aggregate uniform loading of the spectrum across all
devices" requirement, the channel selection algorithm will choose a channel at random from a list
of available channels. The channel selection algorithm is initiated at link initialization and when
radar interference is detected.
General Considerations
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