Line-Of-Sight And Redundant Rf Path; Antenna Height + Distance - NEUTRIK xirium pro User Manual

Description of product

4.4.7 Line-of-sight and redundant RF path

For a reliable wireless audio link, make sure all XIRIUM PRO devices have a line-of-sight connection.
If a line-of-sight connection cannot be established, the receiver may be in a drop-out zone. A drop-
out zone is a point where phase cancellation occurs between the direct signal and the deflected one.
Relocating the transmitter (TX) and/or receiver (RX) can help eliminate this phase anomaly. Using a
repeater can also eliminate the problem of the drop out zone. A repeater effectively provides a re-
dundant RF path to all receivers within range. The RX receives identical audio signals from both the
transmitter and repeater.
Transmitter signal
RX with repeater module

4.4.8 Antenna height + distance

Consider the Fresnel zone, which is an ellipsoidal area between wireless devices. For XIRIUM PRO
TX and RX devices, there should be no obstacles within the Fresnel zone. Maintaining proper
antenna height is essential to ensure trouble-free communication between XIRIUM PRO devices. To
define an area that is free of obstacles, use the following chart to estimate proper antenna height.
Fresnel zone
26
Repeater
signal
radius r
distance d
Identical audio signal
from two different
sources = redundancy
distance d radius r
150 ft 2.7 ft
300 ft 3.8 ft
900 ft 6.6 ft
1500 ft 8.5 ft
3000 ft 12 ft
User Manual – XIRIUM PRO ® CA | BDA 471 2016/09