Lectrosonics T1 - Manual (Page 9)

Multi-Frequency IFB Transmitter
Installation and Operation
1) The T1 transmitter is shipped with pin 1 of the XLR
input connector tied directly to ground. If a floating
input is desired, a Ground Lift Jumper is provided.
This jumper is located inside the unit on the PC
board near the rear panel XLR jack. If a floating
connection is desired, open the unit and move the
Ground Lift Jumper to the desired location.
Location of Ground LIft Jumper:
2) Set the MODE switches on the rear panel to match
the specific input source to be used. (See Mode
Switches.)
3) Insert the power supply plug into the 12 VDC jack
on the rear panel.
4) Insert the microphone XLR plug into the input jack.
Ensure the pins are aligned and that the connector
locks in.
5) Attach the antenna (or antenna cable) to the BNC
connector on the rear panel.
6) Mute the sound source connected to the T1.
7) Set the OFF/TUNE/XMIT switch to TUNE.
8) Adjust the transmitter to the desired frequency with
the front panel FREQ up/down buttons.
9) Position the microphone. The microphone should
be placed in the position in which it will be used
during the program.
10) While speaking at the same voice level that will be
used during the program, observe the front panel
“0” and “-20” Modulation LEDs. Set the AUDIO
LEVEL control to minimum (maximum counter­
clockwise), then adjust the AUDIO LEVEL control
until the “-20” LED begins to flicker. Gradually,
increase the gain until the “-20” LED glows and the
0 LED begins to flicker. The “-20” LED lights when
the audio level is about 20 dB below full modulation.
The “0” LED lights when the limiter begins to
operate. There is over 15 dB of limiting range
without overload above the “0” LED. It is desirable
that it glows about 5-10 percent of the time during
use.
11) Once the transmitter audio gain has been set, the
receiver and other components of the system can
be energized and their audio levels adjusted. Set
the power switch on the T1 transmitter to the XMIT
and adjust the associated receiver and sound
system level as required.
Note: There will be a delay between the moment
the transmitter is energized and when audio will
actually appear at the receiver output. This
intentional delay eliminates turn on thumps, and is
controlled by the pilot tone squelch control.
Rio Rancho, NM 9