Lectrosonics T1 - Manual (Page 7)

Multi-Frequency IFB Transmitter
Front Panel Controls and Functions
T1 Front Panel
OFF/TUNE/XMIT Switch
OFF Turns the unit off.
TUNE Mutes the transmitter section while
enabling the up and down frequency
buttons for setting the operating
frequency of the transmitter.
XMIT Normal operating position. With the
switch in this position, the unit is
transmitting a modulated signal to the
corresponding receiver, and the FREQ
buttons are limited to temporarily
displaying the transmitter HEX switch
settings for the operating frequency and
the TV channel, before reverting back to
displaying the actual operating frequency.
Power Up Sequence
When the OFF/TUNE/XMIT switch is first turned on, the
front panel LED display cycles through the following
sequences:
1.“TEST MODE” momentarily illuminating all
display segments (8.8.8.8.)
2.Momentarily displays firmware version number,
(i.e. 4.0)
3.Displays operating frequency in MHz.
LED Display
This 4-digit display indicates the channel (or operating)
frequency of the unit to the nearest 0.1 MHz (100 kHz).
The LED display also indicates low input power by
blinking continuously when the input voltage drops
below 11.0 Volts.
Adjusting Display Intensity
The LED display’s brightness may be adjusted from 1 to
15, with 15 being the highest intensity. To adjust the
display intensity, turn the unit off, then hold the FREQ
up button while turning the unit back on. The display
will show the current intensity setting. Use the FREQ
up and FREQ down buttons to adjust the brightness
setting. When finished, turn the unit off, wait until the
display extinguishes (about 4 seconds), then turn the
unit back on.
Freq Buttons (Up and Down)
The transmitter frequency is changed by pressing the
appropriate button (see Note). Each push will change
the frequency, up or down, in 100 kHz increments, or
one channel at a time. The FREQ buttons are enabled
when the OFF/TUNE/XMIT switch is in the TUNE
position. Whenever a selected FREQ button is pressed
for more than five seconds, the speed of change
increases to about five channels per second. The T1
will “remember” the last channel selected when the unit
is turned off, and it will set itself to that frequency when
the unit is reenergized.
When the switch is in the XMIT mode, pressing the
FREQ up/down buttons will not disturb the frequency or
the transmitter signal output. In XMIT mode, momen­
tarily pressing the up FREQ button momentarily dis­
plays the HEX switch settings (shown with an Fr prefix),
to the TV channel, then automatically reverts to the
operating frequency display after 3 seconds unless the
button is held. Momentarily pressing the down FREQ
button displays the TV channel first, the HEX switch
settings next, and then reverts back to the operating
frequency.
Note: When the highest or lowest frequency is
reached, the unit will wrap around and continue in
the same direction at the other end of the range.
Audio Level Control
The Audio Level Control is used to adjust the audio
input level for proper modulation. The gain range is
+/-15 dB. The reference for this control can be changed
with the rear panel MODE switches. See the INSTAL­
LATION AND OPERATION section for more information
on the MODE switches.
-20/0 LEDs
These two LEDS are used to set the MIC LEVEL
control and provide a visual indication of audio gain
levels during normal system operation.
-20 LED Flickers when audio level is -20 dB below
full modulation.
0 LED Flickers when the input level is high
enough to cause limiting. The input
limiter has a very high overload threshold.
Generally speaking, some limiting is
desirable in normal operation to improve
the signal to noise ratio of the system.
The limiting action is not audible and
does not create distortion.
Rio Rancho, NM 7