Controls And Functions; Lcd Screen; Power Led; Audio Input Jack - Lectrosonics HMa Instruction Manual

HMa

Controls and Functions

Modulation
LEDs
Input
LCD
Coupler
XLR Input Jack
PWR LED

AUDIO Button

LCD Screen

The LCD is a numeric-type Liquid Crystal Display with
several screens that allow settings to be made with the
AUDIO, FREQ, UP and DOWN buttons to configure
the transmitter. The transmitter can be turned on in a
Standby mode to make adjustments without the risk of
interfering with other wireless systems nearby. Coun-
ters are presented on the LCD enabling this function.

Power LED

The PWR LED glows green when the batteries are
good. The color changes to red when there is about 20
minutes of life left. When the LED begins to blink red,
there are only a few minutes of life.
A weak battery will sometimes cause the PWR LED to
glow green immediately after being put into the unit,
but will soon discharge to the point where the LED will
go red or shut off completely.

Audio Input Jack

The XLR input jack on the transmitter accommodates
most hand-held microphones. Phantom power can
be set at various levels for use with a wide variety of
electret microphones.

Battery Compartment

The battery compartment door is made of machined
aluminum and is hinged to the housing to prevent it
being damaged or lost.
6
Battery
UP Arrow
Compartment

FREQ Button

DOWN Arrow

Modulation LEDs

The Modulation LEDs provide a visual indication of the
input audio signal level from the microphone. These
two bicolor LEDs can glow either red or green to indi-
cate modulation levels. Full modulation (0 dB) occurs
when the -20 LED first turns red.
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
setting, low frequency roll-off and phantom power
mode. Repeatedly pressing the button will cycle
through the available settings, allowing the UP and
DOWN arrow buttons to adjust the values.
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. Frequencies can be selected in
either 100kHz or 25kHz steps. The appearance of the
hexadecimal number is different in the 100kHz step
size mode than in the 25kHz step size mode.
NOTE: The FREQ and AUDIO buttons are used
together to enter the standby mode and to turn the
power on or off.

Up/Down Arrows and Panel Lockout

The Up and Down arrow buttons are used to select the
operating frequency, adjust the audio level, or set the
Compatibility Mode.
Pressing both arrows simultaneously enters the lock
countdown. Holding the two buttons in until the count-
down is completed locks the control panel buttons so
they can only be used to display current settings. "Loc"
is displayed to indicate the controls are locked when a
button is pressed while the panel is locked.
Once locked, the buttons are unlocked by removing
the battery.

Antenna

An antenna is formed between the housing and the at-
tached microphone, operating much like a dipole type.
At UHF frequencies the length of the housing is similar
to 1/4 wavelength of the operating frequency, so the
antenna is surprisingly efficient, which helps extend
the operating range and suppress noise and interfer-
ence.
-20 LED -10 LED
Off Off
Green Off
Green Green
Red Green
Red Red
LECTROSONICS, INC.