Controls And Functions; Lcd Screen; Power Led; Audio Input Jack - Lectrosonics SMDB/E01 Series Instruction Manual

SMB/EO1 Series

Controls and Functions

Modulation
LEDs
Battery
Compartment
Cover Plate
Battery
Compartment
Retaining
Screw
PWR LED

LCD Screen

The LCD is a numeric-type Liquid Crystal Display with
screens for adjusting power, frequency, audio level
and low frequency audio roll-off. The transmitter can
be powered up with or without the RF output turned
on. A countdown appears in the LCD when powering
on and off, allowing the transmitter to be turned on
without RF for adjustments, and to prevent acciden-
tally turning it off with momentary button presses.

Power LED

The PWR LED glows green when the battery is good.
The color changes to red at a mid-point of operating
life, and will continue to glow red until the battery gets
close to the end of its life. When the LED begins to
blink red, there are only a few minutes remaining.
The exact point at which the LED turns red will vary
with battery brand and condition, temperature and
current drain. The LED is simply a reminder intended
to catch your attention, not an exact indicator of re-
maining time.
Green
1.6
1.4
1.2
1.0
.8
Hours
2
Example of AA lithium battery in SMB transmitter
A NiMH rechargeable battery will give little or no
warning when it is depleted because the voltage does
not vary much during its operating life. If you wish
to use NiMH batteries, we recommend trying fully
charged batteries in the unit and using the battery
timer feature available in most receivers to determine
the available operating time.
A weak battery will sometimes cause the PWR LED
to glow green immediately after the transmitter is
turned on, but the battery will soon discharge to the
point where the LED will turn red or the unit will turn
off completely. When the transmitter is in SLEEP
mode, the LED blinks green every few seconds.
6
LCD
UP Arrow
Input Jack
DOWN Arrow

AUDIO Button

FREQ Button

Varies
Red Blink
4 6

Audio Input Jack

The Servo Bias input circuitry accommodates virtu-
ally every lavaliere, handheld or shotgun microphone
available, plus line level signals.
Modulation LEDs
Proper input gain adjustment is critical to ensure the

Antenna

best audio quality. Two bicolor LEDs will glow either
Jack
red or green to accurately indicate modulation levels.
The input circuitry includes a wide range DSP con-
Audio
trolled limiter to prevent distortion at high input levels.
It is important to set the gain (audio level) high
enough to achieve full modulation during louder peaks
in the audio. The limiter can handle over 30 dB of level
above full modulation, so with an optimum setting,
the LEDs will flash red during use. If the LEDs never
flash red, the gain is too low. In the table below, +0 dB
indicates full modulation.
Signal Level
Less than -20 dB
-20 dB to -10 dB
-10 dB to +0 dB
+0 dB to +10 dB
Greater than +10 db
AUDIO Button
The AUDIO button is used to display the audio level
and low frequency roll-off settings. The UP and
DOWN arrows adjust the values.
The AUDIO button is also used with the FREQ button to
enter standby mode and to turn the transmitter on or off.
FREQ Button
The FREQ Button displays the selected operating fre-
quency and also toggles the LCD between displaying
the actual operating frequency in MHz and a two-digit
hexadecimal number that corresponds to the equiva-
lent Lectrosonics Frequency Switch Setting.
The FREQ button is also used with the AUDIO button to
enter standby mode and to turn the transmitter on or off.

Up/Down Arrows

The Up and Down arrow buttons are used to select
the values on the various setup screens and to lock
8
out the control panel. Pressing both arrows simultane-
ously enters the lock countdown. When an attempt is
made to change a setting while the control panel is
locked, a message will flash on the LCD reminding
you that the unit is locked. Once locked, the buttons
can only be unlocked by removing the battery, or via
the RM remote control (if the remote function was
enabled in the transmitter setup).
Antenna
The transmitter uses a whip antenna with a flexible
woven, galvanized steel mesh cable and a standard
SMA connector.
-20 LED -10 LED
Off Off
Green Off
Green Green
Red Green
Red Red
LECTROSONICS, INC.