LECTROSONICS HMa Wideband Plug-On Transmitter with Digital Hybrid Wireless Technology User Guide

HMa Wideband Plug-On Transmitter with Digital Hybrid Wireless Technology

Quick Start GuideHMaWideband Plug-On Transmitterwith Digital Hybrid Wireless® TechnologyHMa, HMa-941, HMa/E01, HMa/E02, HMa/EO6, HMa/E07-941, HMa/X

Fill in for your records: Serial Number:Purchase Date:

Digital Hybrid Wireless® U.S. Patent 7,225,135This guide is intended to assist with initial setup and operation of your Lectrosonics product. For a detailed user manual, download the most current version at: www.lectrosonics.com/manuals21 June 2021

Controls and Functions

Input Coupler

Modulation LEDs


UP Arrow

Battery CompartmentCover

XLR Input Jack PWR LED AUDIO Button FREQ ButtonLCD ScreenBacklit for easy viewing in bright or dimly lit conditions.

DOWN Arrow

Pwr (power) LEDIndicates power status and battery strength.

XLR Input JackStandard 3-pin Switchcraft XLR type. Coupler is spring-loaded to maintain a snug fit and to prevent noise.

Modulation LEDsProvides a visual indication of the audio input signal level – either red or green to indicate modulation levels.

AUDIO ButtonAdjust the audio gain setting (0 dB to 44 dB).

FREQ ButtonUsed to set the operating frequency and toggle the LCD between the operating frequency in MHz and a two-digit hexadecimal frequency code.

UP/DOWN ArrowsUsed to view and select parameters and values during setup and operation.

Battery Compartment CoverHinged to housing to prevent loss of cover.

USB PortUSB Port for firmware updates in the field.

IR PortIR (infrared) port for fast setup.2


Battery InstallationThe transmitter is powered by two AA batteries (Lithium recommended).Note: Standard zinc-carbon batteries marked “heavy-duty” or “longlasting” are not adequate. To install new batteries: 1. Slide open the Battery Cover and remove any old batteries. 2. Insert the new batteries into the housing. One battery goes in positive (+) end first, the other negative (-) end first. Look into the battery compartment to determine which end goes in which side. The side with the plastic ring is the side which accepts the positive end of the battery.Note: It is possible to install the batteries backward and close the battery door, but the batteries will not make contact and the unit will not power up. 3. Slide the Battery Cover until it snaps securely shut.

positive (+) negative (­)



USB PortBattery Cover

Battery Compartment


IR (Infrared) Port 3

Operating InstructionsPowering On in Operating Mode1) Ensure that good batteries are installed.2) Simultaneously press and hold the AUDIO and FREQ buttons as the timer counts from 1 to 3 (about 3 seconds).Powering Off in Operating Mode1) Simultaneously press and hold the AUDIO and FREQ buttons while observing that the word OFF and the counter in the LCD.2) When the counter reaches 0, the unit turns off.

Initial Power On Timer ScreenInitial Power Off Timer Screen

Note: If the AUDIO and FREQ buttons are released before the end of the countdown, the unit will not turn off.

Powering On/Off in Standby ModeFrom the OFF position, quickly press and release both the AUDIO and FREQ buttons simultaneously to enter and exit this mode. Adjustments and settings can be checked or changed, but the unit will not be transmitting to avoid interfering with other systems in the vicinity.

Standby Screen

Up Button MenuHold the UP button wihile powering up the unit. Then press the AUDIO button repeatedly to scroll through the following settings. Use the UP and DOWN arrow to select the available options under each setting.

Selecting the Compatibility Mode (Up Button Menu)CP (Compatibility Mode); press the UP and DOWN arrows to select one of the following:

Note: RF transmission is prevented while selecting Compatibility Modes. Also, the HMa exits this screen to the Standby Mode.· Nu Hybrid – Digital Hybrid receivers· 3 – (Mode 3) For non-Lectrosonics analog receivers. Contact the the factory for details.· IFB – For Lectrosonics IFB receivers.While in the compatibility mode screen, pressing either the AUDIO or FREQ button exits to standby mode. To power off from the compatibility mode screen, press and hold AUDIO and FREQ together.

NOTE: If your Lectrosonics receiver does not have Nu Hybrid mode, set the receiver to Euro Digital Hybrid Wireless® (EU Dig. Hybrid).



RF Power Output (Up Button Menu)

Pr (RF Power output) may be selected as:


Selectable 100 or 25 mW


Selectable 25 or 50 mW


10 mW


Selectable 50 or 100 mW EIRP


Selectable 50 or 100 mW

HMa/E07-941: Selectable 50 or 100 mW

Selecting the Audio Polarity (Up Button Menu)The input to the transmitter can be set for Pin 2 XLR Pin 2 as positive (+) or negative (­)(+) to match the polarity of other mics being used.Pin 2 (­)Selecting Step Size Mode (Up Button Menu) The frequency increments can be set at either 25 kHz or 100 kHz.



DOWN Button MenuHold the DOWN button while powering up the unit. Then press the AUDIO button repeatedly to scroll through the following settings. Use the UP and DOWN arrow to select the available options under each setting.Enable Remote Controlrc on and rc OFF enable and disable remote control functions. See page 7.Power Back On (DOWN Button Menu)PbAc (Power back on after power loss) allows the unit to either (1) turn back on after power loss or (0) remain off.LCD Backlight Setting (DOWN Button Menu)The LCD backlight can be set to stay on continuously or turn off after either 5 minutes or 30 seconds .

Band/Legacy Block 606 Setting(Down Button Menu)Allows access to either the full C1 bnad or only a portion of Block 606. When using a a Block 606 receiver such as an SRb/E01-606 or a UCR411a-606, the pilot tones must match for the receiver to recognize the signal from the tranmsitter.NOTE: This function is only available for the HMA/E01-C1.

Audio Screen Menu

The Audio Screen is used to adjust input gain and low frequency roll-off, and to turn phantom power on and off. Repeatedly pressing the AUDIO button selects the setting. Press and hold the AUDIO button and use the UP and DOWN arrows to adjust the value.



Adjusting the Input Gain (Audio Screen Menu)The control panel Modulation LEDs indicate the modulation level and limiter activity. This gain adjustment matches the transmitter gain with the microphone’s output level, the user’s voice level and the position of the microphone. Once set, the transmitter’s audio level setting should not be used to control the volume of your sound system or recorder levels. The audio input level can be set with the unit in Standby Mode or while powered up in normal operation.

Signal Level

-20 LED

-10 LED

Less than -20 dB



-20 dB to -10 dB



-10 dB to +0 dB



+0 dB to +10 dB



Greater than +10 dB



Note: Voice levels vary significantly between different people. If several different people will be using the transmitter and there is not time to make the adjustment for each individual, adjust it for the loudest voice.1) With the HMa powered off, insert the microphone plug into the XLR Input Jack, aligning the pins and ensuring that the connector locks.2) Place the transmitter in the Standby Mode, or if the unit is to be powered up and adjusted, mute the main sound system prior to powering up the transmitter.3) Position the microphone in the location where it will be used in actual operation.4) Observe the audio level LEDs while speaking or singing into the microphone at the same voice level that will be used during use. While holding the AUDIO button, press the UP or DOWN arrows until both the -20 and -10 LEDs glow green, with the -20 LED flickering red on louder peaks. This will optimize the signal to noise ratio of the system with full modulation and adequate headroom to prevent overload and audible compression of signal peaks.

Note: Setting the audio level too high reduces the dynamic range of the audio signal. Setting the audio level too low may cause hiss and noise in the audio.5) If the unit was set up in Standby Mode, it will be necessary to turn the transmitter off, then power it up again in normal operation so the RF output will be on. Then the other components in the sound or recording system can be adjusted.

Adjusting the Low Frequency Roll-Off (Audio Screen Menu)Repeatedly press the AUDIO button until the LF roll-off adjustment screen appears. Then press and hold the AUDIO button while selecting the desired roll-off frequency with the UP and DOWN arrows.



Selecting the Phantom Power Supply (Audio Screen Menu)The transmitter input jack can provide phantom power for the attached microphone if needed, with voltages at 5, 15, or 48. Phantom power will consume a slight amount of battery power, so it can also be turned off. With the transmitter powered on and in the normal or standby mode, press and hold the audio button and observe the LCD. Release the button and press and hold it again. Repeat this process until the display indicates the PH.

Once you get to the PH setting, keep the AUDIO button pressed, then use the UP and DOWN arrow keys to cycle through the available settings (off, 5, 15, 48 volts) until the desired setting is displayed.When you release the AUDIO button, the setting will be stored to the value you selected.

Remote Control Functions (dweedle tones)Settings can be adjusted with the LectroRM phone app. LectroRM is a mobile application for iOS and Android operating systems. Its purpose is to remotely control Lectrosonics transmitters. The available functions are:· Input Gain · Lock/Unlock · Tx power output · Frequency · LEDs on/off · Audio LF roll-offThe app was released by New Endian, LLC in September 2011. The app is available for download and sells for $20 on the Apple App Store and Google Play Store.

Setting Transmitter Operating Frequency1) If the LCD is displaying something other than the Frequency Screen, press the FREQ button on the Control Panel to enter this screen.

Note: The default display is in MHz. Pressing the FREQ button again displays the operating frequency as a two-digit hexadecimal number that corresponds to legacy Lectrosonics products that used two 16-position switches to set the frequency.2) While holding the FREQ button, use the UP or DOWN arrow buttons to move the operating frequency up or down.

Note: The operating frequency displayed on the LCD wraps as it

reaches the upper or lower end of its range. Thus, if you intend to move

the operating frequency from the lower end of the range to the upper

end, it may be faster to do this by using the DOWN arrow until the

frequency wraps to the upper end.



Set Up in 100 kHz ModeFrequency displayed in MHz

The operating frequency can be displayed either in MHz or as a two-digit hexadecimal number. The example of the two-digit display shown here indicates CH (channel) and 2C as the frequency.The frequency can be set with the unit in standby mode or when powered up for normal operation.

Frequency displayed as two-digit hexadecimalnumber

Set Up in 25kHz Mode

Frequency expressed in MHz

The hexadecimal display in the 25 kHz mode will appear with a decimal suffix to indicate the 25 kHz steps.

Frequency in hex

Standard frequency block (20)

Frequency in hexcode (F6)

Offset in MHz (.25)

Lock/Unlock ScreenSimultaneously pressing and holding both the UP and DOWN arrow buttons during normal operation starts the Lock timer. The timer starts at three and counts down to zero. When the timer reaches zero, the keypad controls are locked.The LCD will display the locked condition as long as the arrow buttons are held, then revert backto the previous screen when either button is released.With the controls locked, the AUDIO and FREQ buttons can still be used to display current settings. Any attempt to change a setting by pressing either the UP or DOWN arrow button will result in an on-screen Loc reminder that the controls are locked. Remove the batteries to unlock the control panel.Important: Once the transmitter is locked, it cannot be unlocked or powered off using the buttons. The only way to unlock a locked transmitter is to remove the batteries.



Special Purpose Barrel AdaptersMic adapter for Earthworks M30 microphone with HM, HMa and UH400a/TM transmitters.This polarity reversing adapter may be needed to correct for asymmetrical current draw in some P48 powered condenser microphones, including older Neumann 100 Series, Rode NTG3 and others. If you microphone does not power on correctly when used with these transmitters, insert the adapter between the transmitter and microphone.

P/N 21750 Polarity ReversingBarrel AdapterMCA-M30

Earthworks M30 Barrel Adapter

This adapter may be needed if you are experiencing noise or distortion with measurement microphones, particularly the Earthworks M30. The adapter has a common mode choke for suppressing RF noise. If your microphone signal exhibits the problems listed above when connected to a UH400, HM or HMa transmitter, insert the adapter between the microphone and the transmitter.Insert the adapter between the transmitter and microphone to alleviate the problems listed above.





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LIMITED ONE YEAR WARRANTYThe equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot correct the defect in your equipment, it will be replaced at no charge with a similar new item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you. This warranty applies only to items returned to Lectrosonics, Inc. or an authorized dealer, shipping costs prepaid, within one year from the date of purchase. This Limited Warranty is governed by the laws of the State of New Mexico. It states the entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL, OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE EQUIPMENT. This warranty gives you specific legal rights. You may have additional legal rights which vary from state to state.®

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