User manual

9
Personal PA
®
DSP FM Wideband Transmitter
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 RF shielding. Determining the effectiveness of this method for your
installation usually requires some experimentation. Necessary capacitors can be obtained from Williams Sound or from any
electronic parts supplier. See Figure 4.
Figure 4: Connecting to a Balance/Unbalanced Line
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
Installing the ANT 025 Whip Antenna
Gently thread the ANT 025 onto the stud recessed in the hole on the top of the transmitter. See Figure 5.
Figure 5: Installing the ANT 025 Antenna (rear view)
ANT 025 ANTENNA
(INCLUDED)
REMOTE ANTENNA
COAXIAL JACK
FOR
75 Ohm ANTENNAS
(See note below)
A410
24VDC 0.75A
williamssound.com
Line / Mic In
Analog
Audio
Digital
Audio
Line Out AES / EBU In S/PDIF In RF 75 Ω Ant Ethernet
bal
—
unbal
—
phantom
NOTE: If the T45 is going to be rack mounted, you will not be able to install the ANT 025 whip antenna. For rack mounting,
consider installing a remote antenna like the ANT 005 or ANT 024 - these antennas require using the Remote Antenna
Coaxial Jack (above) and a long length of terminated coaxial cable. Another option is to mount the antenna on the
rack itself - consider the ANT 029 which includes a 1RU bracket and a 3ft terminated coaxial cable. For a full list of
antenna options, please go to our website www.williamssound.com and view the Antenna Application Guide under
“Products - Accessories - Antennas”.