DR-4000 Series Owner’s Manual
20
TIPS
Antenna
• For optimum operation with external antennas, low
loss RF shielded cable should be used with the length
of the cable not exceeding 3 meters.
• The receiver’s antennas should be kept away from
any metal surfaces whenever possible, as they can
deter or shield the incoming RF signal.
• If the Volume Control of the receiver is set too high, it
may over-drive the input of the attached audio mixer,
causing distortion. Conversely, if the output is set too
low, the overall signal-to-noise ratio of the system
may be reduced, causing noticeable hiss. If such
noise occurs, adjust the output level of the receiver
such that the highest sound pressure level going into
the microphone transmitter causes no input overload
in the mixer, and yet permits the mixer level control
to operate in the normal range (not too high and not
too low). This provides the optimum signal-to-noise
ratio for the entire system.
• Before operation, please confirm that the receiver
and associated transmitter are tuned to the same
frequency GROUP and CHANNEL number.
• After making a receiver CHANNEL change,
please make sure that the corresponding change is
also made on the matching transmitter (i.e. program
your transmitter).
• Position the receiver such that it has the least number
of obstructions between it and the transmitter. Line of
sight is best.
Transmitter
• During operation, the transmitter and the receiver
should be as close as possible for optimum results, but
never closer than 3’ (1 meter), as that may overload
the receiver’s input circuitry and cause noise.
• It is generally recommended that batteries should be
removed anytime the transmitters are not being used.
• When using the DR-T45 Body Pack for instrument
use, note that scratchy noises can occur when some
electric guitars with dirty pots or connections are
used with any wireless system. Therefore, the supplied
capacitor provides first-order filtering of the RF signal
from the cord into the guitar and eliminates virtually
all scratchy noises. If your equipment still gives you
scratchy noises, follow these troubleshooting steps:
– Make sure all guitar volume and tone pots
are clean and all contacts are solid—this is
very important.
– A 47pF capacitor soldered across the pot to
ground terminal of the guitar’s volume and tone
pots will provide extra filtering.
Batteries
• Before inserting batteries, please make sure that
they are inserted with the correct polarity.
• Use only brand new alkaline batteries. Do not use
“general purpose” carbon batteries. When batteries
are weak, replace the batteries altogether at
the same time. Do not mix or use new and old
batteries together.
Receiver
• For the best operation, the receiver should be placed
at least 1 meter above the ground and 1 meter away
from a wall or metal surfaces. Also, the transmitter
should be also at least 1 meter from the receiver.
Keep antenna away from noise source such as
motors, automobiles, neon lights, signal processors,
computers, as well as large metal objects.
• A receiver cannot receive signals from two or more
transmitters simultaneously.
8868 Digital Ref 4600 Manual.indd 20
10/27/09 10:37:18 AM
