Lectrosonics HMa User manual

HMa
Wideband Plug-On Transmitter
With Digital Hybrid Wireless®Technology
HMa, HMa-941, HMa/E01, HMa/E02, HMa/E06, HMa/E07-941, HMa/X
INSTRUCTION MANUAL
Rio Rancho, NM, USA
www.lectrosonics.com
Fill in for your records:
Serial Number:
Purchase Date:
Digital Hybrid Wireless®
US Patent 7,225,135
WARNING: Moisture, including talent’s
sweat, will damage the transmitter. Wrap the
HMa in a plastic baggie or other protection
to avoid damage or see HMCVR.

HMa, HMa-941, HMa/EO1, HMa/E02, HMa/E06, HMA/E07-941, HMa/X
LECTROSONICS, INC.
2

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 3
Thank you for selecting a Lectrosonics HMa Plug-On
transmitter. The unique design provides several distinct
features for professional applications:
• Outstanding RF operating range
• Superb audio quality
• Corrosion-resistant housing
• Programmable compatibility modes for use with a
wide variety of dierent receivers
The Digital Hybrid Wireless®design (US Patent 7,225,135)
combines 24-bit digital audio with analog FM resulting in
a system that has the same operating range as analog
systems, the same spectral eciency as analog systems,
the same long battery life as analog systems, plus the
excellent audio delity typical of pure digital systems.
The transmitter uses a standard 3-pin XLR input jack for
use with any microphone with a a mating XLR connec-
tor. An LCD, membrane switches and multi-color LEDs
on the control panel make input gain adjustments and
frequency and compatibility mode selection quick and
accurate, without having to view the receiver. The hous-
ing is machined from a solid aluminum block to provide a
lightweight and rugged package. A special non-corrosive
nish resists salt water exposure and perspiration in
extreme environments.
The DSP-based design works with all Digital Hybrid
receivers, and is backward compatible for use with Lec-
trosonics 200 and 100 Series, Mode 3, Mode 6, Mode
7, and IFB receivers and some other brands of analog
wireless receivers. Companion receivers are covered in
separate manuals. Your Lectrosonics representative can
guide you through any compatibility concerns.
Table of Contents
General Technical Description ......................................... 4
Digital Hybrid Wireless®Technology............................... 4
No Pre-Emphasis/De-Emphasis .................................... 4
Low Frequency Roll-Off.................................................. 5
Input Limiter .................................................................... 5
Signal Encoding and Pilot Tone ..................................... 5
Microprocessor and DSP ............................................... 5
Compatibility Modes....................................................... 5
Control Panel .................................................................. 5
Controls and Functions..................................................... 6
LCD Screen ..................................................................... 6
Power LED ...................................................................... 6
Audio Input Jack............................................................. 6
Battery Compartment ..................................................... 6
USB Port ......................................................................... 6
IR Port ............................................................................. 6
Modulation LEDs ............................................................ 6
Audio Button ................................................................... 6
Freq Button ............................................................. 6
UP/DOWN Arrows and Panel Lockout........................... 6
Antenna ........................................................................... 6
Battery Installation ............................................................ 7
Attaching/Removing a Microphone................................. 7
Operating Instructions ...................................................... 8
Power Up and Boot Sequence....................................... 8
Power Down.................................................................... 8
Automatic Power Restore .............................................. 8
Standby Mode................................................................. 8
UP Button Menu ............................................................. 8
DOWN Button Menu ....................................................... 9
AUDIO Button Settings................................................... 10
FREQ Button Settings .................................................... 11
Block 470/19 Frequency Overlap................................... 11
Lock/Unlock Screen ....................................................... 12
Remote Control with “Dweedle Tones” ......................... 12
LectroRM............................................................................ 13
Supplied & Optional Accessories..................................... 14
P/N 21750 Barrel Adapter............................................... 14
MCA-M30 Barrel Adapter ............................................... 14
PHTRAN3 ........................................................................ 14
MCA5X ............................................................................ 15
MCA-TPOWER................................................................ 15
HMCVR/HMCVR-BLK ..................................................... 15
Specications and Features............................................. 16
Firmware Update............................................................... 17
Troubleshooting................................................................. 19
Service and Repair ............................................................ 21
Returning Units for Repair.............................................. 21
EU Declaration of Conformity ........................................ 22
Additional Compliance Notices...................................... 23
FCC Compliance:
This device complies with FCC radiation exposure limits as set
forth for an uncontrolled environment. This device should be
installed and operated so that its antenna(s) are not co-located or
operating in conjunction with any other antenna or transmitter.
Notice to the End User:
The normal condition of using this device is to keep the hand at
least 20mm away from the base of the microphone.

HMa, HMa-941, HMa/EO1, HMa/E02, HMa/E06, HMA/E07-941, HMa/X
LECTROSONICS, INC.
4
The HMa transmitter uses a DSP controlled input lim-
iter featuring a wide range dual envelope design which
cleanly limits input signal peaks over 30 dB above full
modulation. Switching power supplies to provide con-
stant voltages to the transmitter circuits from the begin-
ning (3 Volts) to the end (1.7 Volts) of battery life, and an
ultra low noise input amplier for quiet operation.
Digital Hybrid Wireless
®
Technology
All wireless links suer from channel noise to some de-
gree, and all wireless microphone systems seek to mini-
mize the impact of that noise on the desired signal. Con-
ventional analog systems use compandors for enhanced
dynamic range, at the cost of subtle artifacts (known as
“pumping” and “breathing”). Wholly digital systems defeat
the noise by sending the audio information in digital form,
at the cost of some combination of power, bandwidth and
resistance to interference.
Lectrosonics Digital Hybrid Wireless®systems over-
come channel noise in a dramatically new way, digitally
encoding the audio in the transmitter and decoding it
in the receiver, yet still sending the encoded informa-
tion via an analog FM wireless link. This proprietary
algorithm is not a digital implementation of an analog
compandor but a technique that can be accomplished
only in the digital domain, even though the inputs and
outputs are analog.
General Technical Description
Channel noise still impacts received signal quality and
will eventually overwhelm a receiver. Digital Hybrid Wire-
less®simply encodes the signal to use a noisy channel
as eciently and robustly as possible, yielding audio
performance that rivals that of wholly digital systems,
without the power and bandwidth problems inherent in
digital transmission.
Because it uses an analog FM link, Digital Hybrid Wire-
less®enjoys all the benets of conventional FM wire-
less systems, such as excellent range, ecient use of
RF spectrum, and resistance to interference. However,
unlike conventional FM systems, it does away with the
analog compandor and its artifacts.
No Pre-Emphasis/De-Emphasis
The Digital Hybrid Wireless®design results in a signal-to-
noise ratio high enough to preclude the need for con-
ventional pre-emphasis (HF boost) in the transmitter and
de-emphasis (HF roll-o) in the receiver. This eliminates
the potential for distortion on signals with abundant
high-frequency information.
Bias Voltage
42V,15V, 5V
+4V
Input
Amp
Shunt
Limiter
AUDIO
FREQ
UP
DWN
Reference
Crystal
Reference
Crystal
3 V
Battery
Hi.Lo
Pass
Filter
Digital
PotAudio
Level
Phantom
Power
Audio A-D
Converter
11001001
D-A
Converter
11001001
Control Panel
Microprocessor
Voltage
Controlled
Oscillator
Final
Amplifier
Filter
Amp
Encoded Audio
and Pilot Tone
Bicolor
Modulation
LEDs
Switching
Power
Supply
Digital Signal Processor
Phase Locked Loop
LCD
1.2V
4V
-3.3V
+3.3V

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 5
Low Frequency Roll-O
The low frequency roll-o can be set for a 3 dB down
point at 35, 50, 70, 100, 120 and 150 Hz to control sub-
sonic and very low frequency audio content in the au-
dio. The actual roll-o frequency will vary slightly depend-
ing upon the low frequency response of the microphone.
Excessive low frequency content can drive the trans-
mitter into limiting, or in the case of high level sound
systems, even cause damage to loudspeaker systems.
The roll-o is normally adjusted by ear while listening as
the system is operating.
Input Limiter
A DSP-controlled analog audio limiter is employed
before the analog-to-digital (A-D) converter. The limiter
has a range of more than 30 dB for excellent overload
protection. A dual release envelope makes the limiter
acoustically transparent while maintaining low distor-
tion. It can be thought of as two limiters in series, a fast
attack and release limiter followed by a slow attack and
release limiter. The limiter recovers quickly from brief
transients, with no audible side eects, and also recov-
ers slowly from sustained high levels, to keep audio dis-
tortion low and while preserving short term dynamics.
Signal Encoding and Pilot Tone
In addition to controlling the limiter, the DSP also en-
codes the digitized audio from the A-D converter and
adds an ultrasonic pilot tone to control the receiver’s
squelch. A pilot tone squelch system provides a reliable
method of keeping a receiver output muted (squelched)
even in the presence of signicant interference. When
the system is operating in the hybrid mode, a dier-
ent pilot tone frequency is generated for each carrier
frequency in 100 kHz increments to prevent inadvertent
squelch problems and simplify multi-channel coordina-
tion.
Microprocessor and DSP
A microprocessor monitors user command inputs from
the control panel buttons and numerous other internal
signals. It works intimately with the DSP to ensure the
audio is encoded according to the selected Compatibil-
ity Mode and that the correct pilot tone is added to the
encoded signal.
Compatibility Modes
The transmitter was designed to operate with Lectroson-
ics Digital Hybrid Wireless® receivers and will yield the
best performance when doing so. However, due to the
exibility of digital signal processing, the transmitters
can also operate in various compatibility modes (vary
per specic model) for use with Lectrosonics Mode 3
and IFB receivers. It will also work with certain non-Lec-
trosonics receivers. Contact your sales representative or
the factory for a complete list of compatible non-Lectro-
sonics receivers.
Control Panel
The control panel includes four membrane switches and
an LCD screen to adjust the operational settings. Multi-
color LEDs are used to indicate audio signal levels for
accurate gain adjustment and for battery status.

HMa, HMa-941, HMa/EO1, HMa/E02, HMa/E06, HMA/E07-941, HMa/X
LECTROSONICS, INC.
6
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 and FREQ buttons, and the UP and DOWN ar-
row buttons to congure the transmitter. The transmitter
can be turned on in a “standby” mode with the carrier
turned o to make adjustments without the risk of inter-
fering with other wireless systems nearby.
Power LED
The PWR LED glows green when the batteries are good.
The color changes to red when there is about 20 min-
utes 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 o completely.
Audio Input Jack
The XLR input jack on the transmitter accommodates
hand-held, shotgun and measurement 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 be-
ing damaged or lost.
USB Port
USB Port for rmware updates in the eld.
IR Port
IR (infrared) port for fast setup.
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. Full modulation (0 dB) occurs when
the -20 LED rst turns red.
Signal Level -20 LED -10 LED
Less than -20 dB O O
-20 dB to -10 dB Green O
-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-o 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
frequency 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 dierent 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 control panel is unlocked by removing
the battery or using the remote control “dweedle” tones.
Antenna
An antenna is formed between the housing and the
attached microphone, operating much like a dipole. At
UHF frequencies the length of the housing is similar
to 1/4 wavelength of the operating frequency, so the
antenna is surprisingly ecient, 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

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 7
Battery Installation
The transmitter is powered by two AA batteries.
Note: Standard zinc-carbon batteries marked
“heavy-duty” or “long-lasting” are not
adequate.
WARNING: Risk of explosion if the battery is
replaced by an incorrect type.
Batteries operate in series, with a connecting plate built
into the battery door
To install new batteries:
1. Slide open the Battery Cover and remove any old
batteries.
2. Insert the new batteries into the housing. One bat-
tery goes in positive (+) end rst, the other negative
(-) end rst. Look into the battery compartment to
determine which end goes in which side. The side
with the circular insulator is the side which accepts
the positive end of the battery.
positive (+)
terminal
negative (–)
terminal
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 work.
3. To close the door, press it inward, ush with the
housing, then slide it back into place until it snaps
Attaching/Removing a
Microphone
The spring loaded coupler under the XLR jack main-
tains a secure t to the microphone jack with continu-
ous pressure applied by an internal spring.
To attach the microphone, simply align the XLR pins
and press the microphone onto the transmitter until the
coupler retracts and latches. A click sound will be heard
as the connector latches.
To remove the microphone, hold the transmitter body
in one hand with the microphone pointing upward. Use
your other hand to rotate the coupler until the latch
releases and the coupler rises slightly.
Do not pull on the microphone while releasing the lock-
ing collar.
TO AT TA CH
TO REMOVE
Hold the
transmitter
case with the
microphone
pointed
upward.
Rotate the
collar in the
direction
shown.
Pull on mic to ensure it is locked.
Press firmly, listen for click.
Depress collar fully.
Click!
NOTE: Do not hold or apply any pressure to
the microphone body while trying to remove it,
as this may prevent the latch from releasing.

HMa, HMa-941, HMa/EO1, HMa/E02, HMa/E06, HMA/E07-941, HMa/X
LECTROSONICS, INC.
8
Operating Instructions
AUDIO
Button
FREQ
Button
Modulation
LEDs
PWR LED UP Arrow
DOWN Arrow
Power Up and Boot Sequence
1) Ensure that good batteries are installed in the unit.
2) Simultaneously press and hold the AUDIO and
FREQ buttons. Continue holding the buttons until
On and the characters 1, 2, 3 have appeared. The
boot sequence will then initiate.
Initial Power On
Timer Screen
As the unit turns on, the
Modulation LEDs and PWR
LED all glow red, then green,
and then they revert to
normal operation.
The LCD displays a bootup sequence which con-
sists of ve screens:
Category: Example
Company Name: Lectro
Frequency Band (XX) and Firm-
ware Version (rX.XX):
A1 r1.00
Compatibility Mode: CP 400
RF Power Output: 100
Operating Frequency 482.875
Power Down
Simultaneously press and hold the AUDIO and
FREQ buttons. Continue holding the buttons until
OFF and the countdown characters 3, 2, 1 have
appeared. The unit will then power down.
Initial Power O
Timer Screen
If the AUDIO and FREQ
buttons are released before
the LCD goes blank at the
end of the countdown, the
unit will not turn o. Instead,
it will stay on and the LCD will return to the previ-
ous screen.
NOTE: If batteries are removed or reach the
end of life while the unit is turned on, the unit
will turn back on with a brief, simultaneous
press of the AUDIO and FREQ buttons. The
counting sequence will not be displayed in
this instance.
Automatic Power Restore
The rmware will remember the power on/o state and
the settings when batteries reach their end of life or are
removed. When fresh batteries are installed, the unit
will reboot and return to the previous settings without
the need to press any buttons. This only works when
the unit is fully on and transmitting. It does not work
in the Standby Mode.
Standby Mode
Standby Screen
Standby Mode allows you to
verify or change the transmit-
ter’s operating frequency or
audio input level without trans-
mitting a signal. Quickly press and release both the
AUDIO and FREQ buttons simultaneously to enter and
exit this mode. The characters rF OFF will appear on
the LCD while the unit is in the standby mode.
UP Button Menu
Hold the UP button while powering up the unit.
Hold
Then press both
Then press the AUDIO button repeatedly to scroll
through the settings. Use the UP and DOWN arrow to
select the available options under each setting.
Compatibility Mode Screen (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 HM
exits this screen to the Standby Mode.
• nHb - For Digital Hybrid Wireless®receivers.
• 3 - (Mode 3) For non-Lectrosonics analog receiv-
ers. 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 o from the compatibility mode screen, press
and hold AUDIO and FREQ together.

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 9
RF Power Output (Up Button Menu)
Pr (RF Power output) may be selected as:
HMa: Selectable 100 or 25 mW
HMa/E01: Selectable 25 or 50 mW
HMa/E02: 10 mW
HMa/E06: Selectable 50 or 100 mW EIRP
HMa-941: Selectable 50 or 100 mW
Selecting
the Audio Polarity (Up Button Menu)
The character Pdenotes
“positive” polarity and
the character ndenotes
ʼnegative” polarity.
NOTE: The audio polarity can also
be reversed at the output of most
Lectrosonics receivers.
Selecting Step Size mode (Up Button Menu)
The frequency increments can be set at either 25 kHz
or 100 kHz. Hold the UP arrow in while powering up the
unit to enter the setup screen. Press the AUDIO button
repeatedly to step through the setup items to reach the
Step Size Mode screen. Use the UP or DOWN arrow but-
ton to select the desired setting.
DOWN Button Menu
Hold the DOWN button while powering up the unit.
Hold
Then press both
Then press the AUDIO button repeatedly to scroll
through the setup screens. Use the UP and DOWN arrow
to select the available options for each setting.
Remote Control Enable “Dweedle Tones”
rc on allows the transmitter to respond to audio signals
(“dweedle tones”) delivered to the microphone from a
smart phone app. rc oFF disables this function.
If a remote control signal is detected but the function is
turned o, the message rc oFF will be displayed briey
on the transmitter’s LCD to conrm that a valid signal
was received, but that the remote control function is
not enabled.
HMa transmitter settings that can be adjusted:
• Audio input level (gain)
• Operating frequency
• Panel Lock/Unlock
• RF power output
• Low frequency roll-o lter
• Power LED on/o
The LectroRM Smart Phone App is used almost
exclusively for remote control. See the section entitled
Remote ‘Control with Dweedle Tones on page 12 for
more information.
Power Back On (DOWN Button Menu)
PbAc (Power back on after power loss) sets the unit to
either (1) turn back on after power loss or (0) remain o.
LCD Backlight Setting (Down Button Menu)
The LCD backlight can be set to turn o after either 5
minutes or 30 seconds or stay on continuously. Hold
the DOWN arrow in while powering up the unit to enter
the setup screen. Press the AUDIO button repeatedly
to step through the setup items to reach the backlight
settings screen. Use the UP or DOWN arrow button to
select the desired setting.
Band/Legacy Block 606 Setting(Down Button Menu)
Allows access to either the full B1, B2 or C1 band or
only 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. Press and hold the DOWN
arrow button then press the AUDIO button to access.
AUDIO Button Settings
Press the AUDIO button
repeatedly to select the setting.
Each time the button is re-
leased, the screen will switch to
the next setting. Press and hold
the button when the desired
setting appears on the screen,

HMa, HMa-941, HMa/EO1, HMa/E02, HMa/E06, HMA/E07-941, HMa/X
LECTROSONICS, INC.
10
then use the UP and DOWN arrow buttons to adjust the
setting.
Adjusting the Input Gain
The control panel Modulation
LEDs indicate the modulation
level and limiter activity. This gain
adjustment matches the transmitter gain with the micro-
phone’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 O O
-20 dB to -10 dB Green O
-10 dB to +0 dB Green Green
+0 dB to +10 dB Red Green
Greater than +10 dB Red Red
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 o, 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
the both the -20 and -10 LEDs glow green, with the
-20 LED ickering 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 o, 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-o
The roll-o frequency can be set
to 35, 50, 70, 100, 120 or 150 Hz.
This setting is often made while
listening to the audio while selecting the setting.
Selecting the Phantom Power Supply
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 o.
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 o.
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 but-
ton pressed, then use the UP and DOWN arrow keys to
cycle through the available settings (o, 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.
About the Phantom Power Supply
Three phantom voltages are selectable from the control
panel. The voltages are:
• 5 Volts for lavaliere microphones,
• 15 Volts for some professional mics requiring
high current and for many common stage mics
that will operate over a wide phantom Voltage
range of 12 to 48 Volts. With the proper adapter,
this position can also be used with T power
microphones. See our web site for details on
nding or making the proper adapter.
• 48 Volts for microphones that do in fact require a
supply greater than 18 Volts. (See following for a
discussion of why 42 and not a “true” 48 Volts.)
For longest battery life use the minimum phantom
voltage necessary for the microphone. Many stage
microphones regulate the 48 Volts down to 10 Volts
internally anyway, so you might as well use the 15 Volt
setting and save some battery power. If you are not
using a microphone for the input device, or are using a
microphone that does not require phantom power, turn
the phantom power o.
Phantom power should only be used with a fully oat-
ing, balanced device such as most microphones with
a 3-pin XLR connector. If you use the phantom power
with an unbalanced device or if pins 2 or 3 are DC con-

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 11
nected to ground, then you will draw maximum current
from the power supply. The HM is fully protected against
such shorts but the batteries will be drained at twice the
normal rate.
The transmitter can supply 4 mA at 42 Volts, 8 mA at 15
Volts, and 8 mA at 5 Volts. The 42 Volts setting actually
supplies the same voltage to a 48 Volt microphone as
the DIN standard arrangement due to a dynamic bias-
ing scheme that does not have as much voltage drop as
the DIN standard. The 48 Volt DIN standard arrangement
protects against shorts and high fault current with high
resistance in the power supply feeds to pins 2 and 3.
This provides protection if the supply current is acciden-
tally shorted to ground and also keeps the microphone
from being attenuated by the power supply.
The HMa improves on those functions and is able to use
less power from the battery by using constant current
sources and current limiters. With this dynamic arrange-
ment the HMa can also supply more than twice the cur-
rent of competing 48 Volt plug on units and provide four
times the current for some very high end 15 Volt micro-
phones.
FREQ Button Settings
Press the FREQ button on the Control Panel to enter
this setup screen. The display will vary depending upon
which StepSize setting is selected. See Selecting Step
Size on page 9.
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.
While holding the FREQ button, use the UP or DOWN
arrow buttons to change the frequency.
Note: The operating frequency displayed on the
LCD wraps as it reaches the upper or lower end
of its range.
Block 470/19 Frequency Overlap
Frequencies 486.400 - 495.600 Overlap in Blocks 470 and 19
Block 470 and block 19 overlap each other in the fre-
quency range from 486.400 to 495.600 MHz. Since block
470 starts at a lower frequency than block 19, the hex
codes (and pilot tones) will not match even though the
frequencies are the same in the overlap zone. When
using a transmitter on the A1 band with a block 19
receiver, be sure the transmitter is set to block 19 and
check the hex code on the receiver to make sure it
matches the transmitter.
Call the factory for further questions on this issue.
Set Up in 100kHz Step Size
Frequency displayed as
two-digit hexadecimal
number
Frequency 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.
Set Up in 25kHz Step Size
Frequency expressed in MHz
The hexadecimal display in the 25 kHz mode will ap-
pear with a decimal sux to indicate the 25 kHz steps.
Standard
frequency
block (20)
Frequency
in hex
code (F6)
Oset in
MHz (.25)
Frequency in hex
Examples:
475.875 MHz
490.225 MHz
487.650 MHz
509.200 MHz
Lock/Unlock Screen
Simultaneously 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 back to the pre-
vious screen when either button is released.
With the controls locked, the AUDIO and FREQ but-
tons can still be used to display current settings. Any

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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.
NOTE: The control panel can be unlocked by
removing the batteries or using the “dweedle”
tone remote control.
Remote Control with “Dweedle Tones”
Various settings on the transmitter can be adjusted with
special audio tones (“dweedle tones”) delivered to the
microphone. The tones are generated by a smart phone
using the LectroRM app.
LectroRM is a third party application written by New
Endian for iOS and Android smart phones that gener-
ates the control tones for the remote control functions.
The app is available for purchase from the App Store or
Google Play for about $20.
HMa transmitter settings that can be adjusted:
• Audio input level (gain)
• Operating frequency
• Panel Lock/Unlock
• RF power output
• Low frequency roll-o lter
• Power LED on/o
Enable the remote control function by holding the
DOWN arrow then pressing the AUDIO and FREQ but-
tons at the same time. Use the arrow buttons to select
on to enable the function, or oFF to disable the function.
If a remote control signal is detected but the function
is turned o, the message rc oFF will be displayed
briey on the transmitter’s LCD to conrm that a valid
signal was received, but that the control function is not
enabled. If a remote control setting is delivered to the
transmitter that is not available, such as SLEEP/UN-
SLEEP in the HMa, the display on the transmitter will
show ––––––and then return to the previous screen.
The usable distance between the microphone and the
smart phone will vary with the input gain setting on the
transmitter and the volume control setting on the smart
phone.
NOTE: Any microphone/transmitter within
range of the smart phone will “hear” and
execute the remote control command.
Be careful to make sure only the desired
microphone/transmitter is within range when
delivering the audio tone.

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 13
LectroRM
By New Endian LLC
LectroRM is a mobile application for iOS and Android
operating systems. Its purpose is to remotely control
Lectrosonics Transmitters, including:
• SM Series
• WM
• L Series
• HMa, HMa/E01
The app remotely changes settings on the transmit-
ter through the use of encoded audio tones, which
when received by the attached microphone, will alter
the congured setting. The app was released by New
Endian, LLC in September 2011. The app is available for
download and sells for $25 on the Apple App Store and
Google Play Store.
LectroRM’s remote control mechanism is the use of an
audio sequence of tones (dweedles) that are interpreted
by the transmitter as a conguration change. The set-
tings available in LectroRM are:
• Audio Level
• Frequency
• Sleep Mode
• Lock Mode
User Interface
The user interface involves selecting the audio se-
quence related to the desired change. Each version has
an interface for selecting the desired setting and the
desired option for that setting. Each version also has a
mechanism to prevent accidental activation of the tone.
iOS
The iPhone version keeps each available setting on a
separate page with the list of options for that setting.
On iOS, the “Activate” toggle switch must be enabled to
show the button which will then activate the audio. The
iOS version’s default orientation is upside-down but can
be congured to orient right-side up. The purpose for
this is to orient the device’s speaker, which is at the bot-
tom of the device, closer to the transmitter microphone.
Android
The Android version keeps all settings on the same
page and allows the user to toggle between the activa-
tion buttons for each setting. The activation button must
be long pressed to activate. The Android version also
allows users to keep a congurable list of full sets of
settings.
Activation
For a transmitter to respond to remote control audio
tones, the transmitter must meet certain requirements:
• The transmitter must not be turned o; it can
however be in sleep mode.
• The transmitter must have rmware version
1.5 or later for Audio, Frequency, Sleep and
Lock changes.
• The transmitter microphone must be
within range.
• The transmitter must be congured to enable
remote control activation.
Please be aware this app is not a
Lectrosonics product. It is privately owned
and operated by New Endian LLC,
www.newendian.com.

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LECTROSONICS, INC.
14
Optional Accessories
21750 Barrel Adapter
Mic adapter for Earthworks M30 microphone
with HM, HMa and UH400a/TM transmitters.
This polarity reversing adapter may be
needed to correct for asymmetrical cur-
rent draw in some P48 powered condenser
microphones, including older Neumann
100 Series, Rode NTG3 and others. If your
microphone does not power on correctly
when used with these transmitters, insert the
adapter between the transmitter and micro-
phone.
MCA-M30 Barrel Adapter
This adapter may be needed if you are expe-
riencing 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.
Supplied Accessories
PHTRAN3
Replacement leather pouch with clear plastic screen
cover, rotating belt clip and snap closure. Included with
transmitter at purchase.
40096 Alkaline Batteries (2)
Barrel Adapter Earthworks M30

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 15
MCA5X
Optional adapter for connecting a lavaliere microphone
to the HMa or HM transmitters. TA5M to XLR3-M
connectors. Passes transmitter phantom power to
bias the electret lavaliere microphone. Includes zener
protection to limit bias voltage to protect the microphone
if transmitter phantom power is set too high.
MCA-TPOWER
This cable adapter is to be used with the UH200D,
UH400, HM and HMa plug-on transmitters with
T-powered microphones. It will protect a T-power mic
against the 48V phantom power setting in the transmitter
while allowing normal operation. The transmitter should
be set to the 15V position for best operation and
minimum battery drain.
HMCVR/HMCVR-BLK
These tough white silicone covers protect transmitters
from moisture and dust. The pliable material and the two-
part design make the covers easy to install and remove.
By customer request, we also oer these covers in
opaque matte black. Ideal for television broadcast,
stage or other high-prole visual applications where a
seamless and sleek appearance is desired.

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Modulation indicators: Dual bi-color LEDs indicate
modulation of -20, -10, 0, +10 dB
referenced to full modulation
Audio Performance (overall system):
Frequency Response: 35 Hz to 20 kHz (+/-1dB);
Low frequency Roll-o: Adjustable for -3dB @30, 50, 70, 100,
120 or 150 Hz)
THD: 0.2% (typ. 100 Hz to 20 kHz -
see table)
Signal to Noise Ratio (dB) at receiver output:
SmartNR no limiting w/limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0
Note: The dual envelope “soft” limiter provides exceptionally good handling of
transients using variable attack and release time constants. Once activated, the
limiter compresses 30+ dB of transmitter input range into 4.5 dB of receiver output
range, thus reducing the measured gure for SNR without limiting by 4.5 dB.
Input Dynamic Range: 125 dB (with full Tx limiting)
Controls & Indicators: • Power/Phantom “ON-OFF”
• Phantom voltage selector
• Audio input gain
• LCD w/membrane switches
• LED audio level indicators
Audio Input Jack: Standard 3-pin XLR (female)
Phantom Power: 5V @ 18 mA max., 15V @ 15 mA
max. and 48 V @ 4 mA max.,
plus “OFF”
USB port: Used for rmware updates
IR (infrared) port: For quick setup by transferring
settings from an IR enabled receiver
Antenna: Housing and attached microphone
form the antenna
Battery: Two 1.5 Volt AA alkaline
Battery Life (Duracell Ultra):
AA alkaline; No Phantom Power: 5h 0m*
AA alkaline; 48V Phantom Power: 3h 30m**
* Tested with a dynamic microphone
** Tested with a Sanken CS1 for a phantom-powered microphone
Weight: 6.7 oz (190 grams) without batteries
Dimensions: 4.25x1.62x1.38 inches
107.95x41.15x35.05 mm
Emission Designator: A1: 44K3F3E
B2: 57K9F3E
HMa/E06: 180KF3E
HMa/E07-941: 110KF3E
Specications subject to change without notice.
Operating Frequency Range:
HMa: Band A1: 470.100 - 537.575
Band B1: 537.600 - 607.950
HMa/X: Band A1: 470.100 - 537.575
Band B1: 537.600 - 614.375
Band C1: 614.400 - 691.175
HMa/E01: Band A1: 470.100 - 537.575
Band B1: 537.600 - 614.375
Band B2: 563.200 - 639.900
Band C1: 614.400 - 691.175
HMa/E02: Band A1: 470.100 - 537.575
Band B1: 537.600 - 614.375
Band C1: 614.400 - 691.175
Band C2: 640.000 - 713.900
HMa/E06: Band B1: 537.600 - 614.375
Band C1: 614.400 - 691.175
HMa-941: 941.525 - 951.975
952.875 - 956.225
956.475 - 959.825
HMa/E07-941: 941.525 - 951.975
953.025 - 956.225
956.475 - 959.825
NOTE: It’s the user’s responsibility to select the
approved frequencies for the region where the
transmitter is operating
Frequency Selection Steps: Selectable; 100 kHz or 25 kHz
RF Power output: HMa: Selectable 100 or 50 mW
HMa/E01: Selectable 25 or 50 mW
HMa/E02: 10 mW
HMa/E06: Selectable 50
or 100 mW EIRP
HMa/E07-941: Selectable 50 or 100 mW
HMa-941: Selectable 50 or 100 mW
Compatibility Modes: HMa: Nu Hybrid, Mode 3, IFB Mode
HMa/E01: Digital Hybrid, Mode 3, IFB Mode
HMa/E02: Digital Hybrid, Mode 3, IFB Mode
HMa/E06: Digital Hybrid,Mode 3, IFB Mode
HMa/E07-941, HMa-941: Nu Hybrid, IFB Mode
HMa/X: Digital Hybrid, Mode 3, 200 Mode, 100
Mode, Mode 7, Mode 6, IFB Mode
Pilot tone: 25 to 32 kHz; 5 kHz deviation
(in the Digital Hybrid mode)
Frequency stability: ± 0.002%
Spurious radiation: HMa/E01/E02/941/X:
60 dB below carrier
HMa: Compliant with ETSI EN
300 422-1 v1.4.2
Equivalent input noise: –125 dBV (A-weighted)
Input level: Nominal 2 mV to 300 mV, before limiting.
Greater than 1V maximum, with limiting.
Input impedance: 1K Ohm
Input limiter: Dual envelope “soft” limiter; greater
than 30 dB range
Gain control range: 55 dB; panel mounted
membrane switches
Operating temp. range: Celsius: -20° - 40°
Farenheit: -5° - 104°
Specications and Features

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 17
Firmware Update
Updating the rmware is a simple matter of downloading
a utility program and le from the website and running
the program on either a Windows or Mac operating
system with the transmitter connected to a computer via
the USB port.
Go to www.lectrosonics.com. In the top menu, hover the
mouse over Support, then click on Firmware. Choose
your product (HMa) from the list, then review the Firm-
ware Revision History to determine the Update that you
need.
Step 1:
Begin by downloading the USB Firmware Updater Pro-
gram.
Step 2:
Next, test the Updater by opening the icon: If the
driver opens automatically, proceed to Step 3.
WARNING: If you receive the following error, the
Updater is not installed on your system. Follow the
TROUBLESHOOTING steps to fix the error.
TROUBLESHOOTING:
If you receive
the FTDI
D2XX error
shown
above,
download
and install
the driver by
clicking on
this link.
Then click here to download.
NOTE: This website, http://www.ftdichip.com/
Drivers/D2XX.htm, is not associated with
Lectrosonics.com. It is a third party site used
only for D2XX drivers currently available for
Lectrosonics’ devices’ upgrades.
Step 3:
Refer to Step 1 to return to Firmware web page. Down-

HMa, HMa-941, HMa/EO1, HMa/E02, HMa/E06, HMA/E07-941, HMa/X
LECTROSONICS, INC.
18
load Firmware Update and save to a local le on your PC
for easy locating when updating.
Step 4:
Open Lectrosonics USB Firmware Updater.
Step 5:
With the unit powered OFF, put
the transmitter in UPDATE mode
by simultaneously holding down
the UP arrow, DOWN arrow,
AUDIO and
FREQ buttons.
Step 6:
Using a microUSB cable, connect the transmitter to your
PC.
Step 7:
In Lectrosonics USB Firmware Updater, choose the
detected device, browse to local Firmware File and
click Start.
NOTE: It may take up to a minute or so for the
Updater to recognize the transmitter.
WARNING: Do not disrupt the microUSB cable
during updating.
The Updater alerts with progress and completion.
Step 8:
Once the Updater has completed, turn o the trans-
mitter, then turn it back on to verify that the rmware
version on the transmitter LCD matches the rmware
version shown on the web site. The rmware is the
second LCD display during bootup sequence.
Step 9:
Close Updater and disconnect microUSB cable.

Wideband Digital Hybrid®Plug-On Transmitter
Rio Rancho, NM 19
Before going through the following chart, be sure that you have good batteries in the transmitter. It is important
that you follow these steps in the sequence listed.
SYMPTOM POSSIBLE CAUSE
TRANSMITTER PWR LED OFF 1) Batteries are inserted backwards or dead.
2) Transmitter not powered up. (See Operating Instructions,
Power UP and Boot Sequence.)
AUDIO LEVEL LEDs NOT LIGHTING 1) Gain control set to minimum.
2) Batteries are inserted backwards or dead. Check PWR LED.
3) Mic capsule is damaged or malfunctioning.
4) Mic connector is damaged or mis-wired.
RECEIVER RF INDICATOR OFF 1) Transmitter not turned on, or is in Standby Mode.
2) Transmitter batteries are dead.
3) Receiver antenna missing or improperly positioned.
4) Transmitter and receiver not on same frequency.
Check switches/display on transmitter and receiver.
5) Transmitter and receiver not on same frequency band.
6) Operating range is too great.
NO SOUND (OR LOW SOUND LEVEL), RECEIVER INDICATES PROPER AUDIO MODULATION
1) Receiver output level set too low.
2) Receiver output disconnected, or cable defective or mis-wired.
3) Sound system or recorder input is turned down.
DISTORTED SOUND 1) Transmitter gain (audio level) is far too high. Check audio level
LEDs and receiver audio levels during use.
2) Receiver output may be mismatched with the sound system or
recorder input. Adjust output level on receiver to the correct
level
for the recorder, mixer or sound system. (Use the receiver’s Tone
function to check level.)
3) Excessive wind noise or breath “pops.” Reposition microphone
and/or use a larger windscreen.
4) Transmitter is not set to same frequency as receiver.
Check that
operating frequency on receiver and transmitter match.
5) Receiver/Transmitter Compatibility Mode mismatched.
EXCESSIVE FEEDBACK 1) Transmitter gain (audio level) too high. Check gain adjustment
and/or reduce receiver output level.
2) Talent standing too close to speaker system.
Troubleshooting

HMa, HMa-941, HMa/EO1, HMa/E02, HMa/E06, HMA/E07-941, HMa/X
LECTROSONICS, INC.
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SYMPTOM POSSIBLE CAUSE
HISS AND NOISE -- AUDIBLE DROPOUTS 1) Transmitter gain (audio level) far too low.
2) Receiver antenna missing or obstructed.
3) Operating range too great.
4) Signal interference. Turn o transmitter. If receiver’s signal
strength indicator does not drop to nearly zero, this indicates an
interfering signal may be the problem.
Use a clear operating frequency.
“Loc” APPEARS IN DISPLAY WHEN ANY BUTTON IS PRESSED
1) Control Panel is locked. (See Operating Instructions, Locking
and Unlocking the Control Panel.)
“Hold” APPEARS IN DISPLAY WHEN ARROW BUTTONS ARE PRESSED
Reminder that it is necessary to hold down the AUDIO or FREQ
button to make adjustments to the audio gain or frequency
settings.
“PLL” APPEARS IN DISPLAY Indication that the PLL is not locked. This is a serious condition
that requires factory repair. It may be possible to operate on
another frequency far removed from the one that was selected
when the unlocked condition was indicated.