User's Manual

18
minimizing neaR / faR tRansmitteR effects
Line 6 digital wireless systems are designed so that a receiver only passes audio from a transmitter that
is set to the same channel. While other nearby transmitters and RF sources will not create audio in a
receiver not on their channel, under certain conditions they can have an effect on range. When you are
using several channels of wireless, following some simple procedures will minimize any near / far effects.
The XD-V55 receiver constantly monitors the signal from its transmitter, and increases gain (sensitivity)
as the transmitter moves farther away to maintain a good RF signal level. The near / far effect can
happen when the transmitter is at a distance from the receiver’s antennas, and transmitters on different
channels are being used near the antennas. The strong signal from the nearby transmitters, especially
if they are close in frequency to the channel the receiver is set on, can mask the signal from the distant
transmitter – and sometimes cause the audio from that transmitter to drop out.
For example, if the transmitter on the same channel as the receiver is 50 feet away, and another
transmitter is 3 feet from the receiver’s antenna, the range of that distant transmitter might be affected.
Avoid this potential problem by positioning the receivers and their antennas at a more equal distance
from the transmitters that are in use.
Solutions include:
•Making sure that any transmitter is at least 6 feet away from the receivers, and that other RF
sources (such as WiFi routers) are also at a distance from them.
•Placing the antennas higher, which can lessen the difference in distance as well as increase
line-of-sight with the distant transmitter.
•Using remote antennas (with the XD-AD8 antenna distribution system) and placing them
approximately equidistant from each group of transmitters (for example, positioning a remote
antenna connected to
Antenna A nearer to the closer transmitters, and one connected to
Antenna B nearer to the distant transmitters).
•Moving the receiver associated with the distant transmitter closer to it.
antenna mounting and Placement
The XD-V55 receiver is typically used stand-alone, though two will fit side-by-side on a rack tray. When
used by itself and placed on a surface, the antennas are mounted on the rear and connected to the BNC
connectors labeled
Antenna A A and Antenna B . Multiple receivers can share one pair of antennas by
using the XD-AD8 antenna distribution system and P180 directional or P360 omnidirectional remote
antennas.
Note: When rack-mounting receivers, it is preferable to keep them – and their associated antennas –
toward the top of the rack so that line-of-sight to the transmitters is unobstructed for the best range and
performance. Also, keep receivers and equipment such as digital signal processors, computers, WiFi
wireless routers, and other devices that emit RF energy as separated from each other as possible.
Remote antennas become important especially when the distance is significant between the transmitters
and receivers, there are walls or other obstacles between them, or when the receivers are “permanently”
mounted in an equipment room or production vehicle and the transmitters are used at various and
changing locations and distances.
To connect remote antennas to receivers via the XD-AD8, use low-loss 50-ohm coaxial cable with the
appropriate BNC connector on each end. Place the antennas with clear line-of sight to the location
where the transmitters will be used; the Line 6 active antennas provide the convenience of mic stand
mounting. Attach one end of the cable to the antenna, and run it the shortest possible distance to the
antenna distribution system, and from there to the
Antenna A / Antenna B connectors on the back of
the receiver.