The VRs exchange Primary /
Secondary messages on their
Rx frequency while idle. Before
a Primary VR sends out a
Primary Heart Beat (HB), it
checks for RF activity and HB
exceeding the programmed ‘Rx
RSSI Th’ on the Rx frequency.
If the Primary VR does not
detect any RF activity or HB
exceeding the ‘Rx RSSI Th’, it
will proceed with sending a
Primary HB. If it detects HB
exceeding the programmed ‘RX
RSSI Th’, the Primary VR
backs off and becomes non-
Primary, on stand-by. If a HB is
detected but its level is below
the programmed ‘Rx RSSI Th’
the VR will stay a Primary and
send its HB. If it detects RF
activity on the Rx frequency,
the Primary VR will postpone
the sending of its HB until the
Rx frequency is clear to ensure
the HB can be successfully
(without interference) received
by the other VR.
Enables (‘Yes’) or Disables
(‘No’) portable initiated steering
of the MSU mode (zone /
channel). Based on the PL /
DPL programmed in the PSU
and received by the VR. The
VR steers the MSU to the zone
/ channel that is associated with
a specific Rx PL / DPL
programmed in the VR
Steering Table.
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