Lectrosonics HM User Manual download pdf (Page 6)

LECTROSONICS, INC.

Controls and Functions

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 to conﬁgure the trans-

mitter. Turn on and turn off countdowns appear in the

LCDallowingthetransmittertobeturnedonforadjust-

ments without the output stage enabled, and to prevent

accidental turn off.

Power LED

The PWR LED glows green when the batteries are

good. The color changes to red when there is about 30

minutes of operation left with the recommended lithium

batteries. Alkaline batteries will have about 20 minutes

of life left. When the LED begins to blink red, there are

only a few minutes of life.

Note: NiMH batteries will give little or no warning

when depleted. If you wish to use NiMH batteries

in the HM, we recommend trying fully charged

batteries in the unit, noting the length of time that

the batteries will run the unit and then using the

battery timer feature available on most Digital

Hybrid receivers.

A weak battery will sometimes cause the PWR LED to

glow green immediately after being put in 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 HM Series transmitters ac-

commodates most hand-held microphones.

Battery Compartment

TheBatteryCompartmentCoverPlateslidesopen,

allowing access to the battery compartment.

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 indicate

modulation levels. 0 dB in the table below indicates full

modulation.

Signal Level -20 LED -10 LED

Less than -20 dB Off Off

-20 dB to -10 dB Green Off

-10 dB to +0 dB Green Green

+0 dB to +10 dB Red Green

Greater than +10 dB Red Red

Audio Button

The AUDIO button is used to display the audio level set-

ting, 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.

The AUDIO button is also used with the FREQ button to

enter standby mode and to power the transmitter on or off.

Freq Button

The FREQ Button displays the selected operating

frequencyandalsotogglestheLCDbetweendisplaying

the actual operating frequency in MHz and a two-digit

hexadecimal number that corresponds to the equivalent

Lectrosonics Frequency Switch Setting.

The FREQ button is also used with the AUDIO button to

enter standby mode and to power the transmitter on or off.

Up/Down Arrows

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 arrow buttons until the

countdown completes locks the control panel buttons so

they can only be used to display current settings. “Loc”

is displayed to indicate the controls are locked.

Once locked, the buttons can be unlocked only by re-

moving the battery, or via the RM remote control (if this

function was enabled in the transmitter setup).

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 interference.

Battery

Compartment

XLR Input

Jack

AUDIO Button

LCD

Input

Coupler

FREQ Button

Modulation

LEDs

PWR LED

UP Arrow

DOWN Arrow

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Lectrosonics HM User Manual Page 6

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