8
WaveCAST C
Avoiding Hum in the Audio (as a Result of a Ground Loop)
A hum created by a ground loop can often be eliminated by connecting a capacitor in series with the audio line
shield to the transmitter’s ground. This method also maintains good radio frequency (RF) shielding. Determining
the effectiveness of this method for your installation usually requires some experimentation.
IN PHASE
1
2
3
3-PIN
CONNECTOR
BREAKING A GROUND LOOP WHEN
CONNECTING TO A UNBALANCED LINE
BREAKING A GROUND LOOP WHEN
CONNECTING TO A BALANCED LINE
.01 uF CERAMIC DISC
CAPACITOR
.01 uF CERAMIC
DISC CAPACITOR
A110
Selecting an Audio Source Appropriate for Hearing Impaired Listeners
The WaveCAST C transmits audio with excellent fidelity. Therefore, the audio source signal should be of the
highest audio quality and not subject to a compressor, limiter, reverberation, or other signal processing
equipment. While compressed audio is available through the WaveCAST C, excessive compression is not helpful
to the hearing impaired and can contribute to excessive noise in the audio.
The WaveCAST C audio source signal is usually connected to a mixer’s line output signal which is behind the
mixer’s parametric equalizers but ahead of any equalization used for house loudspeakers.
If audio delay is available for use in large auditoriums, it’s usually best to use it. Because radio signals travel faster
than sound, delaying the transmitted audio so that an average listener (in the middle of the listening area) hears
the transmitted audio a few milliseconds after audio from the main sound reinforcement system speaker is
helpful. This will also help audience members who lip read.
Connecting to other Devices
The
Analog LINE/MIC Input (XLR / 1/4")
jack can be used with standard pro audio electronics such as standard
pro audio line level condenser microphones up to 15v or an analog line output from a mixer. The combination
jack accepts either XLR or 1/4” (TRS). This source
must be configured in the menu
before plugging the source
into the jack. If, for example, the MIC Input is selected, and a
line level
source is plugged in, it may be possible to
blow out the MIC input circuitry.
The
Ethernet
and
Dante RJ-45 jacks
can be used to connect the WaveCAST C to either a local network or directly
to a single computer or Dante device. See diagram on page 9.