Controls And Functions; Lcd Screen; Power Led; Power Led Off Feature - Lectrosonics SMB Series Instruction Manual

SMB/EO1, SMB/E02 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 accidentally 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 remain-
ing time.
Green
1.6
1.4
1.2
1.0
. 8
H our s
2
Example of AA lithium battery in SMB transmitter
A NiMH rechargeable battery will give little or no warn-
ing 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 com-
pletely. When the transmitter is in SLEEP mode, the
6
LCD
UP Arrow
Input Jack
DOWN Arrow

AUDIO Button

FREQ Button

Var i es
R ed Bl i nk
4 6
LED blinks green every few seconds.

Power LED Off Feature

In normal opreating mode, the DOWN and UP Arrow
buttons may be used to turn the PWR LED indicators
off and on. This setting does not persist through a
power cycle nor does it affect the LCD backlight.
Antenna
Jack

Audio Input Jack

The Servo Bias input circuitry accommodates virtually
every lavaliere, handheld or shotgun microphone avail-
Audio
able, plus line level signals.
Modulation LEDs
Proper input gain adjustment is critical to ensure the
best audio quality. Two bicolor LEDs will glow either red
or green to accurately indicate modulation levels. The
input circuitry includes a wide range DSP controlled
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-
8
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 out
the control panel. Pressing both arrows simultaneously
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 trans-
-20 LED -10 LED
Off Off
Green Off
Green Green
Red Green
Red Red
LECTROSONICS, INC.