Lectrosonics DBA User Manual

DBa

Digital Belt Pack Transmitter

INSTRUCTION MANUAL

Fill in for your records:

Serial Number:

Purchase Date:

Rio Rancho, NM, USA
www.lectrosonics.com

DBa

2

LECTROSONICS, INC.

Table of Contents

Introduction ............................................................................ 4

Battery Installation ................................................................ 6

Belt Clips ................................................................................ 7

Operating Instructions .......................................................... 7

Powering On in Operating Mode .......................................... 8

Powering On in Standby Mode ............................................ 8

Powering Off ........................................................................ 8

Power Menu Options ............................................................. 8

Entering the Power Menu ..................................................... 8

LCD Menu Map ....................................................................... 9

Main Menu and Setup Screen Details ................................ 10

Entering the Main Menu ..................................................... 10

Main Window Indicators ..................................................... 10

Connecting the Signal Source ........................................... 10

Adjusting the Input Gain ..................................................... 10

Selecting Frequency .......................................................... 11

Selecting Programmable Switch Functions........................ 11

Selecting the Low Frequency Roll-off ................................ 11

Selecting Audio Polarity (Phase) ........................................ 11

Selecting Battery Type ....................................................... 11

BatTime .............................................................................. 11

Locking/Unlocking Changes to Settings............................. 12

Adjusting LCD Backlight .................................................... 12

About .................................................................................. 12

Restoring Default Settings ................................................ 12

Wipekey ............................................................................. 12

Encryption Key and settings transfer ................................ 12

Accessories ......................................................................... 13

5-Pin Input Jack Wiring ....................................................... 14

Microphone Cable Termination

for Non-Lectrosonics Microphones ............................ 15

Input Jack Wiring for Different Sources ............................ 16

Compatible Wiring for Both Servo Bias Inputs

and Earlier Transmitters: .................................................... 16

Simple Wiring for Servo Bias Inputs ONLY: ........................ 16

Microphone RF Bypassing ................................................. 17

Line Level Signals .............................................................. 17

Troubleshooting ................................................................... 18

Specifications and Features ............................................... 19

Service and Repair .............................................................. 20

Returning Units for Repair ................................................. 20

Digital Hybrid Wireless Belt-Pack Transmitter

Rio Rancho, NM

Consumer Alert for US Users - FCC Order DA 10-92

Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this micro­phone system without a license is subject to certain restrictions: the system may not cause harmful interference; it
must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received
from any other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless mi
crophone systems, and these rules are subject to change. For more information, call the FCC at 1-888- CALL-FCC
(TTY: 1-888-TELL-FCC) or visit the FCC’s wireless microphone website at www.fcc.gov/cgb/wirelessmicrophones.
To operate wireless microphone systems at power greater than 50mW, you must qualify as a Part 74 user and be
licensed. If you qualify and wish to apply for a license go to: http://www.fcc.gov/Forms/Form601/601.html

-

3

DBa

Introduction

DSW (Digital Secure Wireless) is designed for no-com­promise applications where performance and security
are the highest priority.

A completely new digital architecture was developed
for the DSW wireless system, which includes the DBa
Transmitter. Extended operating range rivals the best
analog and Digital Hybrid Wireless
remarkable audio quality and only 2.5 ms of latency.
The system operates on standard UHF FCC Part 74
frequencies (TV channel band).

256-bit encryption is applied to the transmitted signal
stream for security against eavesdropping. The algo­rithm conforms to the AES 256-CTR standard.

The DBa transmitter is a second generation design with
specially developed, high efficiency digital circuitry for
extended operating time on two AA batteries. The trans­mitter can tune in coarse or fine steps across the UHF
television band from 470.100 to 691.175 MHz, with an
output power of 50 mW. The pure digital architecture
enables AES 256-CTR encryption for high level security
applications.

Studio quality audio performance is assured by high
quality components in the preamp, wide range input
gain adjustment and DSP-controlled limiting. Input
connections and settings are included for any lavaliere
microphone, dynamic microphones and line level inputs.
Input gain is adjustable over a 44 dB range in 1 dB
steps to allow an exact match to the input signal level,
maximizing the dynamic range and signal to noise ratio.

A separate switch is provided on the top panel that can
be configured as a mute or power switch, or be by­passed.

The housing is constructed of solid machined aluminum
for lasting ruggedness. The exterior is finished with an
ultra hard, black electroless nickel finish called ebENi.

Firmware updates are made through a side panel micro
USB port.

®

systems, with

Frequency Agility

The transmitter tunes across the entire frequency
range, from 470 MHz to 691 MHz.

Servo Bias Input and Wiring

The DBA input preamp is a unique design that delivers
audible improvements over conventional transmitter
inputs. The transmitters are easier to use and much
harder to overload. It is not necessary to introduce pads
on some mics to prevent overload of the input stage,
divide the bias voltage down for some low voltage mics,
or reduce the limiter range at minimum gain settings.

Two different microphone wiring schemes are available
to simplify and standardize the configuration. Simpli­fied 2-wire and 3-wire configurations provide several
arrangements designed for use only with servo bias
inputs to take full advantage of the preamp circuitry.
Other wiring schemes are compatible with Servo Bias
and conventional inputs.

A line level input wiring provides an extended frequency
response with an LF roll-off at 35 Hz for use with instru­ments and line level signal sources.

DSP-controlled Input Limiter

The transmitter employs a digitally-controlled analog
audio limiter prior to the analog-to-digital converter.
The limiter has a range greater than 30 dB for excellent
overload protection. A dual release envelope makes the
limiter acoustically transparent while maintaining low
distortion. It can be thought of as two limiters in series,
connected as a fast attack and release limiter followed
by a slow attack and release limiter. The limiter recovers
quickly from brief transients, so that its action is hidden
from the listener, but recovers slowly from sustained
high levels to keep audio distortion low and preserve
short term dynamic changes in the audio.

4

LECTROSONICS, INC.

DBa Block Diagram

Input
Jack

+5V

Input

Preamp

Servo Bias

Supply

Bias Voltage

0, 2 or 4V

HI/Lo
Pass
Filter

Audio

DBa Transmitter

A-D

Converter

D-A Convert-

Digital Hybrid Wireless Belt-Pack Transmitter

er

I + Q

Baseband

Signals

Low

pass

filters

Shunt

Limiter

Gain

DSP Clock

Oscillator

VCTXO

Adj

Limiter Control

Key Received

Blue LED

PLL Ref

I2S

Microprocessor

Phase Locked Loop

Keypad

I2S

Voltage Controlled

Control

Firmware

Update

Security Key

Oscillator

(2) AA

Batteries

UART

Switching

Supply

Power

LED

Tricolor

Power

USB
Jack

Low
Pass
Filter

IQ Modulator

Buffer

Final

Amplifier

Filters

Rio Rancho, NM

5

DBa

Battery Installation

The transmitter is powered by two AA batteries. We
recommend using alkaline, lithium, or rechargeable
batteries for longest life. Standard zinc-carbon batteries
marked “heavy-duty” or “long-lasting” are not adequate.

The battery status circuitry compensates for the differ­ence in voltage drop between alkaline and lithium bat­teries across their usable life, so it’s important to select
the correct battery type in the menu.

Because rechargeable batteries run down quite abrupt­ly, using the Power LED to verify battery status will not
be reliable. However, it is possible to track battery status
using the battery timer function available in Lectroson­ics Digital Hybrid Wireless receivers.

Push outward on the battery compartment door and lift
it to open.

If the batteries are inserted incorrectly, the door will
close but the unit will not operate.

The battery contacts can be cleaned with alcohol and
a cotton swab, or a clean pencil eraser. Be sure not
to leave any remnants of the cotton swab or eraser
crumbs inside the compartment.

Contact springs

Insert the batteries according to the markings on the
back of the housing.

Battery Status LED Indicator

Alkaline, lithium or rechargeable batteries can be used
to power the transmitter. The type of batteries in use are
selectable in a menu on the LCD.

When alkaline or lithium batteries are being used, the
LED labeled BATT on the keypad glows green when the
batteries are good. The color changes to red when the
they are nearing the end of life. When the LED begins to
blink red, there will be only a few minutes remaining.

The Power/Function LED on the top panel will mirror
the keypad LED unless the programmable switch is set
to Mute, and the switch is turned on.

The exact point at which the LEDs turn red will vary
with battery brand and condition, temperature and
power consumption. The LEDs are intended to simply
catch your attention, not to be an exact indicator of
remaining time.

A weak battery will sometimes cause the LED to glow
green immediately after the transmitter is turned on, but
it will soon discharge to the point where the LED will
turn red or the unit will turn off completely.

Rechargeable batteries give little or no warning when
they are depleted. If you wish to use these batteries in
the transmitter, you will need to manually keep track of
the operating time to prevent interruptions caused by
dead batteries. Start with a fully charged battery, then
measure the time it takes for the Power LED to go out
completely.

6

LECTROSONICS, INC.

Operating Instructions

Digital Hybrid Wireless Belt-Pack Transmitter

Modulation

Indicators

Antenna

Port

Power/Function

-10

AUDIO

-20

mounting hole

Compartment

LED

PWR/FUNC

Battery

Status LED

Belt clip

Battery

Door

Programmable

Function Switch

Audio

Input

Jack

DBa

470.100

-40

Full access to all settings is provided through the key­pad and LCD. The transmitter can also be configured
as a “one button” device by locking the ability to make
changes with the keypad, and configuring the top panel
switch as either power on/off or a mute function.

Key verification

LED

Belt clip

mounting hole

-20

+0

USB Port

Belt Clips

The wire belt clip may be removed by pulling the ends
out of the holes in the sides of the case. Use pliers to
grasp the wire and avoid scratching the surface of the
housing. Pliers also help when installing the clip.

An optional spring-loaded, hinged belt clip (model num­ber BCSLEBN) is also available. This clip is attached by
removing the plastic hole cap on the back of the hous­ing and mounting the clip with the supplied screw.

Rio Rancho, NM

7

DBa

Powering On in Operating Mode

Press and hold the Power Button for several seconds
until a counter on the LCD progresses from 1 through 3.

Hold

DBa

DBa

for
Rf On

...3

When you release the button, the unit will be operation­al with the RF output turned on and the Main Window
displayed.

V0.03

470.100

-40

-20

Powering On in Standby Mode

A brief press of the Power Button , releasing it before
the counter has reached 3, will turn the unit on with the
RF output turned off. In this Standby Mode the menus
can be browsed to make settings and adjustments with­out the risk of interfering with other wireless systems
nearby.

Hold
for
Rf On

...1

After settings and adjustments are made, press the
power button again to turn the unit off.

NOTE: Also see the section entitled Power Menu
for the AutoOn feature.

Release Power

Button before

the counter

reaches 3 to

enter standby

mode

RF indicator blinks

DBa

470.100

-40

-20

+0

Powering Off

Powering
O . . .

1

If the power button is released, or the top panel switch
is turned back on again before the countdown is com­pleted, the unit will remain turned on and the LCD will
return to the same screen or menu that was displayed
previously.

From any screen, power can be
turned off by selecting Pwr Off in the
power menu, holding the Power
Button
countdown, or with the program­mable switch (if it is configured for
this function).

in and waiting for the

Power Menu Options

Entering the Power Menu

Press the power button from any menu or screen
and a menu with appear with several options. Use the

and arrow buttons to select the menu item. Then
press MENU/SEL to execute the item or enter a setup
screen. See opposite page for details.

+0

• Resume - returns to the previous mode and screen

• Rf On? - enters a screen to enable the operating or
standby modes

• AutoOn? - allows the unit to automatically turn
back on after a power failure or when fresh batter­ies are installed (works in the operating mode only)

• Pwr Off - turns the unit off irrevocably

Resume

Rf On?
AutoOn?
Pwr Off

Resume and Pwr Off will execute the command imme­diately. The other menu items will open a screen asking
for a value to be selected.

Rf On?: The RF output of the transmitter can be turned
off and on.

Resume

Resume
Rf On?
AutoOn?

Pwr Off

Rf On?

Resume and Pwr Off

will execute

the command

immediately

The screens that

Rf On?

AutoOn?
Pwr Off

prompt for a selection to be made are straightforward as
in this example. Use the UP and DOWN arrows to
highlight the desired selection an press MENU/SEL or
BACK to confirm it.

Resume

Ye s
No

AutoOn?
Rf On?

AutoOn?

Pwr Off

No
Ye s

NOTE: If the programmable switch is in the OFF
position, power can still be turned on with the
power button. If the programmable switch is then
turned on, a brief message will appear on the LCD.

8

LECTROSONICS, INC.

LCD Menu Map

Digital Hybrid Wireless Belt-Pack Transmitter

Gain

Freq.

ProgSw

Rolloff

Phase

BatType

SEL

SEL

SEL

SEL

SEL

SEL

BACK

BACK

BACK

BACK

BACK

BACK

Gain

Freq.

470.675

(none)
Mute
Power

Rolloff

50 Hz

Phase

Normal
Invert

BatType

Alk.
Lith.

Use arrow buttons

22

to select value

Level meter at bottom of screen

Press MENU/SEL to highlight MHz or kHz

Select value with arrow buttons

Select option with arrow buttons

Select value with arrow buttons

Select option with arrow buttons

Select option with arrow buttons

BatTime

Locked?

Backlit

About

Default

WipeKey

SEL

SEL

SEL

SEL

SEL

SEL

BACK

BACK

BACK

BACK

BACK

BACK

Bat 5:41
Reset?

Yes
No

Locked?

Yes
No

Backlit

On
30 sec
5 min

About

DB
V1.01

Default
Settings

No
Yes

WipeKey?

No
Yes

Select option with arrow buttons

Select option with arrow buttons

Select option with arrow buttons

Displays model number and firmware revision

Select option with arrow buttons

Select option with arrow buttons

Rio Rancho, NM

9

DBa

Main Menu and Setup
Screen Details

Entering the Main Menu

The LCD and keypad interface makes it easy to browse
the menus and make the selections for the setup you
need. When the unit is powered up in either the oper­ating or the standby mode, press MENU/SEL on the
keypad to enter a menu structure on the LCD. Use the

and arrow buttons to select the menu item. Then

press the MENU/SEL button to enter the setup screen.

Gain

Freq.
ProgSw
Rolloff

The prompt in the upper right corner may

display one or both arrows, depending upon

what adjustment can be made. If the changes

are locked, a small padlock symbol will appear.

Gain

-40

-20

25

0

Connecting the Signal Source

Microphones, line level audio sources and instruments
can be used with the transmitter. Refer to the section
entitled Wiring Hookups for Different Sources for
details on the correct wiring for line level sources and
microphones to take full advantage of the Servo Bias
circuitry.

Adjusting the Input Gain

The two bicolor Modulation LEDs on the control panel
provide a visual indication of the audio signal level
entering the transmitter. The LEDs will glow either red
or green to indicate modulation levels as shown in the
following table.

Signal Level -20 LED -10 LED

Less than -20 dB Off Off

-20 dB to -10 dB

-10 dB to +0 dB Green Green

+0 dB to +10 dB Red Green

Greater than +10 dB Red Red

Green Off

Main Window Indicators

The Main Window displays programmable switch func­tion, Standby or Operating mode, operating frequency,
audio level and battery status.

Programmable

Switch Function

DBa

MUTE

470.100

Frequency (MHz)

-40

-20

Audio level

If the programmable switch function is set for Mute, the
Main Window will indicate that the function is enabled.

Mute function

enabled but

not active

DBa

MUTE

470.100

-40

-20

When the switch is turned on, the mute icon appear­ance will change and the word MUTE will blink at the
bottom of the display.

DBa

MUTE

Main Window will blink

the word MUTE when

the audio is muted

Operating

mode

Battery status

+0

+0

NOTE: Full modulation is achieved at 0 dB, when
the “-20” LED first turns red. The limiter can cleanly
handle peaks up to 30 dB above this point.

It is best to go through the following procedure with the
transmitter in the standby mode so that no audio will en­ter the sound system or recorder during adjustment.

1) With fresh batteries in the transmitter, power the

unit on in the standby mode (see previous section
Powering On in Standby Mode).

2) Navigate to the Gain setup screen.

Gain

Freq.

Gain

25

ProgSw
Rolloff

3) Prepare the signal source. Position a microphone

the way it will be used in actual operation and have
the user speak or sing at the loudest level that oc­cur during use, or set the output level of the instru­ment or audio device to the maximum level that will
be used.

4) Use the

until the –10 dB glows green and the –20 dB LED
starts to flicker red during the loudest peaks in the
audio.

5) Once the audio gain has been set, the signal can

be sent through the sound system for overall level
adjustments, monitor settings, etc.

and arrow buttons to adjust the gain

-40

-20

0

470.100

<–MUTE–>

10

LECTROSONICS, INC.

Digital Hybrid Wireless Belt-Pack Transmitter

6) If the audio output level of the receiver is too high or
low, use only the controls on the receiver to make
adjustments. Always leave the transmitter gain ad­justment set according to these instructions, and do
not change it to adjust the audio output level of the
receiver.

Selecting Frequency

The setup screen for frequency selection offers two
ways to browse the available frequencies.

Gain

Freq.

Freq.

Freq.

ProgSw

494.500

494.500

Rolloff

Hit the MENU/SEL button to select each field. Use the

and arrow buttons to adjust the frequency. Each
field will step through the available frequencies in a dif­ferent increment.

Selecting Programmable Switch Functions

The programmable switch on the top panel can be con­figured using the menu to provide several functions:

• (None) - disables the switch

• Mute - mutes the audio when switched on

• Power - turns the power on and off

Gain
Freq.

ProgSw

Rolloff

NOTE: The programmable switch will continue
to operate whether or not keypad changes are
locked.

ProgSw

(none)
Mute
Power

Use the and

arrow buttons to

select the desired

function or disable

the switch

Selecting the Low Frequency Roll-off

The low frequency audio roll-off is adjustable to op­timize performance for environmental conditions or
personal preference.

Low frequency audio content may be desirable or
distracting, so the point at which the roll-off takes place
can be set to 35, 50, 70, 100, 120 and 150 Hz.

Gain
Freq.
ProgSw

Rolloff

Rolloff

70 Hz

Selecting Audio Polarity (Phase)

Audio polarity can be inverted at the transmitter so the
audio can be mixed with other microphones without
comb filtering. The polarity can also be inverted at the
receiver outputs.

Phase

Phase

BatType
BatTime
Locked?

Normal
Invert

Selecting Battery Type

The voltage drop over the life of different batteries var­ies by type and brand. Be sure to set the correct battery
type for accurate indications and warnings. The menu
offers alkaline or lithium types.

Phase

BatType

BatType

BatTime
Locked?

If you are using rechargeable batteries, it is better to
use the timer function on the receiver to monitor the
battery life rather than the indicators on the transmitter.
Rechargeable batteries maintain a fairly constant volt­age across the operating time on each charge and stop
working abruptly, so you will have little or no warning as
they reach the end of operation.

Alk.
Lith.

BatTime

A built-in timer can be used with any battery type, but it
is especially valuable with rechargeable batteries such
as NiMH types. The voltage remains fairly constant
across the discharge time of a rechargeable battery,
then drops quickly near the end of the operating time.
The most accurate way to determine runtime status
is by testing the time provided by a particular battery
brand and type, then using a timer to determine remain­ing runtime.

Phase
BatType

BatTime

Locked?

Bat 3:30
Reset?

No
Ye s

Bat 0:00
Reset?

No
Ye s

Rio Rancho, NM

11

DBa

Locking/Unlocking Changes to Settings

Changes to the settings can be locked to prevent inad­vertent changes being made.

Phase

Locked?
BatType
BatTime

Locked?

A small padlock symbol will appear on adjustment

screens when changes have been locked.

When changes are locked, several controls and actions
can still be used:

• Settings can still be unlocked

• Menus can still be browsed

• Programmable switch still works

• Power can still be turned off by using the power
menu or removing the batteries.

Ye s
No

Gain

-40

25

-20

Adjusting LCD Backlight

For viewing the LCD in dimly lit conditions, the backlight
can be turned on continuously or set to turn off auto­matically after either 30 seconds or 5 minutes.

Backlit

About
Default
Wipekey

Backlit

On
30 Sec
5 min

Restoring Default Settings

This is used to restore the factory settings.

Backlit
About

Default

Wipekey

0

Default
settings

No
Ye s

Wipekey

The encryption key can be erased with this setup
screen.

Backlit

WipeKey?

About
Default

Wipekey

No
Ye s

Encryption key and settings transfer

A cable between the receiver and the micro USB port
on the side of the transmitter is used to transfer the
encryption key from the receiver to the transmitter. This
connection can also be used to send the transmitter
settings stored in the receiver to the transmitter.

The interface cable, P/N DRKEYCABLE, is used to
make this connection.

About

Displays the model of the transmitter and the firmware
version.

Backlit

About

Default
Wipekey

About

DBa
V0.03

NOTE: Reference the DSW System Instruction
Manual for instructions on Encryption Key settings
and software.

12

LECTROSONICS, INC.

Accessories

P/N 26895 Wire belt clip

BCSLEBN Spring-loaded belt clip

M152/5P 700 Lavaliere microphone; omnidirectional

MI33PRA Instrument cable; passive type for use
with very high output pickups; right
angle 1/4” plug

MI33PST Instrument cable; passive type for use
with very high output pickups; straight
1/4” plug

MC35 Line level adapter cable; XLR-F
to TA5F; 37” length

Digital Hybrid Wireless Belt-Pack Transmitter

MC41 Dynamic mic level adapter cable;
XLR-F to TA5F; 37” length

P/N 55008 AA battery caddy; 4-pack; blue

Rio Rancho, NM

13

DBa

5-Pin Input Jack Wiring

The wiring diagrams included in this section represent
the basic wiring necessary for the most common types
of microphones and other audio inputs. Some micro­phones may require extra jumpers or a slight variation
on the diagrams shown.

It is virtually impossible to keep completely up to date
on changes that other manufacturers make to their
products, thus you may encounter a microphone that
differs from these instructions. If this occurs please call
our toll-free number listed under Service and Repair in
this manual or visit our web site at:

www.lectrosonics.com

1

2

3

4

5

GND

5V SOURCE

MIC

VOLTAGE SELECT

LINE IN

100 Ohm

10k

2.7K

+5 VDC

Servo Bias

500 Ohm

1k

+

15uF

+

200 Ohm

3.3uF

Pin 4 to Pin 1 = 0 V

Pin 4 Open = 2 V

Pin 4 to Pin 2 = 4 V

30uF

+

To Audio Amplifier

To Limiter Control

Backshell with

strain relief

Audio input jack wiring:

PIN 1
Shield (ground) for positive biased electret lavaliere
microphones. Shield (ground) for dynamic microphones
and line level inputs.

PIN 2
Bias voltage source for positive biased electret lavaliere
microphones that are not using servo bias circuitry and
voltage source for 4 volt servo bias wiring.

PIN 3
Microphone level input and bias supply.

PIN 4
Bias voltage selector for Pin 3.
Pin 3 voltage depends on Pin 4 connection.

Pin 4 tied to Pin 1: 0 V
Pin 4 Open: 2 V
Pin 4 to Pin 2: 4 V

PIN 5
Line level input for tape decks, mixer outputs, musical
instruments, etc.

Cable clamp

TA5F Latchlock

Insert

Insulator

Installing the Connector:

1) If necessary, remove the old connector from the
microphone cable.

2) Slide the dust boot onto microphone cable with the
large end facing the connector.

3) If necessary, slide the 1/8-inch black shrink tubing
onto the microphone cable. This tubing is needed
for some smaller diameter cables to ensure there
is a snug fit in the dust boot.

4) Slide the backshell over the cable as shown above.
Slide the insulator over the cable before soldering
the wires to the pins on the insert.

5) Solder the wires and resistors to the pins on the
insert according to the diagrams shown in Wiring
Hookups for Different Sources. A length of .065
OD clear tubing is included if you need to insulate
the resistor leads or shield wire.

Backshell

without strain

relief

6) If necessary, remove the rubber strain relief from

7) Seat the insulator on the insert. Slide the cable

8) Insert the assembled insert/insulator/clamp into

Remove strain relief

if using dust boot

Dust boot (35510)

Note: If you use the dust boot, remove the rubber
strain relief that is attached to the TA5F cap, or the
boot will not fit over the assembly.

the TA5F backshell by simply pulling it out.

clamp over the and of the insulator and crimp as
shown on the next page.

the latchlock. Make sure the tab and slot align
to allow the insert to fully seat in the latchlock.
Thread the backshell onto the latchlock.

14

LECTROSONICS, INC.

Digital Hybrid Wireless Belt-Pack Transmitter

Microphone Cable Termination
for Non-Lectrosonics Microphones

TA5F Connector Assembly

Mic Cord Stripping Instructions

1

23

VIEW FROM SOLDER

SIDE OF PINS

4

5

0.15"

0.3"

Crimping to Shield and Insulation

Strip and position the cable so that the clamp
can be crimped to contact both the mic cable
shield and the insulation. The shield contact
reduces noise with some microphones and the
insulation clamp increases ruggedness.

Rio Rancho, NM

Shield

Crimp these

fingers to

contact the

shield

Insulation

Crimp these

fingers to
clamp the
insulation

NOTE: This termination is intended for UHF
transmitters only. VHF transmitters with 5-pin
jacks require a different termination. Lectrosonics
lavaliere microphones are terminated for
compatibility with VHF and UHF transmitters,
which is different from what is shown here.

15

DBa

Input Jack Wiring for Different Sources

In addition to the microphone and line level wiring illus­trated below, Lectrosonics makes a number of cables
and adapters for other situations such as connecting
musical instruments (guitars, bass guitars, etc.) to the
transmitter. Visit www.lectrosonics.com and click on
Accessories, or download the master catalog.

A lot of information regarding microphone wiring is also
available in the FAQ section of the web site at:

www.lectrosonics.com > SUPPORT > FAQs

Follow the instructions to search by model number or
other search options.

Compatible Wiring for Both Servo Bias Inputs and Earlier Transmitters:

Fig. 1

2 VOLT POSITIVE BIAS 2-WIRE ELECTRET

SHIELD

A UDI O

Compatible wiring for microphones such as
Countryman E6 headworn and B6 lavaliere.

3.3 k

1.5 k

PIN

1

2

3

4

5

Fig. 2

4 VOLT POSITIVE BIAS 2-WIRE ELECTRET

Most common type of wiring for lavaliere mics.
Fully compatible with 5-pin inputs on Lectrosonics
transmitters such as the LM and UM Series.

Fig. 3

DPA MICROPHONES (Danish Pro Audio miniature models)

4

3

T A5 F
PLUG

1

5

2

Fig. 8

UNBALANCED LINE LEVEL SIGNALS

LINE LEVEL
RCA or 1/4” PLUG

For signal levels up to 3V (+12 dBu) before limiting. Fully
compatible with 5-pin inputs on other Lectrosonics transmitters
such as the LM and UM Series. A 20k ohm resistor can be
inserted in series with Pin 5 for an additional 20 dB of
attenuation to handle up to 30V (+32 dBu).

SLEEVE

TIP

SHIELD

A UDI O

Fig. 8

UNBALANCED LINE LEVEL SIGNALS

LINE LEVEL
RCA or 1/4” PLUG

For signal levels up to 3V (+12 dBu) before limiting. Fully
compatible with 5-pin inputs on other Lectrosonics transmitters
such as the LM and UM Series. A 20k ohm resistor can be
inserted in series with Pin 5 for an additional 20 dB of
attenuation to handle up to 30V (+32 dBu).

SLEEVE

TIP

SHIELD

A UDI O

PIN

1

2

4

5

3

3

4

T A5 F

5

PLUG

See Line Level

Signals on next page

PIN

1

2

4

5

3

3

4

T A5 F

5

PLUG

1

2

1

2

This wiring is for DPA lavalier
and headset microphones.

NOTE: The resistor value can range from 3k to 4k ohms.

Fig. 4

2 VOLT NEGATIVE BIAS 2-WIRE ELECTRET

SHIELD

AUDIO

Compatible wiring for microphones
such as negative bias TRAM models.

NOTE: The resistor value can range from 2k to 4k ohms.

Fig. 5

4 VOLT POSITIVE BIAS 3-WIRE ELECTRET
WITH EXTERNAL RESISTOR

SHIELD

Used for 3-wire lavaliere
microphones that require an
external resistor such as the
Sanken COS-11.

This wiring is fully compatible with 5-pin inputs on Lectrosonics
transmitters such as the LM and UM Series. This is the wiring
for the Lectrosonics M152 lavaliere microphone.

DRAIN (BIAS)

SOURCE (AUDIO)

Fig. 6

LO-Z MICROPHONE LEVEL SIGNALS

2.7 k

PIN

Simple Wiring for Servo Bias Inputs ONLY:

Fig. 9

1

2

1

4

3

5

3

T A5 F

PLUG

2

4

5

2 VOLT POSITIVE BIAS 2-WIRE ELECTRET

Simplified wiring for microphones
such as Countryman B6 Lavalier
and E6 Earset models and others.

NOTE: This Servo Bias wiring is not compatible with earlier
versions of Lectrosonics transmitters. Check with the factory
to confirm which models can use this wiring.

Fig. 10

2 VOLT NEGATIVE BIAS 2-WIRE ELECTRET

Simplified wiring for microphones such as negative bias TRAM.

NOTE: This Servo Bias wiring is not compatible with earlier
versions of Lectrosonics transmitters. Check with the factory
to confirm which models can use this wiring.

Fig. 11

4 VOLT POSITIVE BIAS 3-WIRE ELECTRET

XLR JACK

Insert 1k resistor in series with pin 3 if attenuation is needed

For low impedance dynamic mics or electret
mics with internal battery or power supply.

16

NOTE: This Servo Bias wiring is not compatible with earlier
versions of Lectrosonics transmitters. Check with the factory
to confirm which models can use this wiring.

LECTROSONICS, INC.

Digital Hybrid Wireless Belt-Pack Transmitter

Microphone RF Bypassing

When used on a wireless transmitter, the microphone
element is in the proximity of the RF coming from the
transmitter. The nature of electret microphones makes
them sensitive to RF, which can cause problems with
microphone/transmitter compatibility. If the electret
microphone is not designed properly for use with wire­less transmitters, it may be necessary to install a chip
capacitor in the mic capsule or connector to block the
RF from entering the electret capsule.

Some mics require RF protection to keep the radio sig­nal from affecting the capsule, even though the trans­mitter input circuitry is already RF bypassed.

If the mic is wired as directed, and you are having dif­ficulty with squealing, high noise, or poor frequency
response, RF is likely to be the cause.

The best RF protection is accomplished by installing RF
bypass capacitors at the mic capsule. If this is not pos­sible, or if you are still having problems, capacitors can
be installed on the mic pins inside the TA5F connec­tor housing. Refer to the diagram below for the correct
locations of capacitors.

Use 330 pF capacitors. Capacitors are available from
Lectrosonics. Please specify the part number for the
desired lead style.

Leaded capacitors: P/N 15117
Leadless capacitors: P/N SCC330P

All Lectrosonics lavaliere mics are already bypassed
and do not need any additional capacitors installed for
proper operation.

Line Level Signals

The wiring for line level and instrument signals is:

• Signal Hot to pin 5

• Signal Gnd to pin 1

• Pin 4 jumped to pin 1

This allows signal levels up to 3V RMS to be applied
without limiting.

NOTE for line level inputs only (not instrument):
If more headroom is needed, insert a 20 k resistor
in series with pin 5. Put this resistor inside the
TA5F connector to minimize noise pickup. The
resistor will have little or no effect on the signal if
the input is set for instrument.

Line Level

Normal Wiring

See Fig. 8 on

previous page

Line Level

More Headroom

(20 dB)

2-WIRE MIC 3-WIRE MIC

CAPSULE

Capacitors next

to mic capsule

SHIELD

AUDIO

CONNECTOR

TA5F

CAPSULE

Capacitors in

TA5F connector

SHIELD

AUDIO

BIAS

TA5F

CONNECT

OR

Rio Rancho, NM

17

DBa

Troubleshooting

It is important that you follow these steps in the sequence listed.

Symptom: Possible Cause:

Transmitter Battery LED off 1. Batteries are inserted incorrectly.
when Power Switch “ON” 2. Batteries are low or dead.

No Transmitter Modulation LEDs 1. Gain control turned all the way down.
when Signal Should be Present 2. Batteries are inserted incorrectly. Check power LED.

3. Mic capsule is damaged or malfunctioning.

4. Mic cable damaged or miswired.

5. Instrument Cable damaged or not plugged in.

6. Musical instrument output level set too low.

Receiver Indicates RF But No Audio 1. Audio source or cable connected to transmitter is defective. Try
using an alternate source or cable.

2. Make sure the compatibility mode is the same on transmitter and
receiver.

3. Ensure musical instrument volume control is not set to minimum.

4. Check for correct pilot tone indication on the receiver. See item on
page 11 entitled About Overlapping Frequency Bands.

Receiver RF Indicator Off 1. Ensure that the transmitter and receiver are set to the same
frequency, and that the hex code matches.

2. Transmitter not turned on, or battery is dead.

3. Receiver antenna missing or improperly positioned.

4. Operating distance is too great.

5. Transmitter may be set to the Standby Mode. See page 8.

No Sound (Or Low Sound Level), Receiver 1. Receiver output level set too low.
Indicates Proper Audio Modulation 2. Receiver output is disconnected; cable is defective or miswired.

3. Sound system or recorder input is turned down.

Distorted Sound 1. Transmitter gain (audio level) is too high. Check Modulation
LEDs on transmitter and receiver while distortion is being heard.

2. Receiver output level 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.

3. Transmitter and receiver may not be set to the same compatibility
mode. Some mis-matched combinations will pass audio.

4. RF interference. Reset both transmitter and receiver to a clear
channel. Use scanning function on receiver if available.

Wind Noise or Breath “Pops’” 1. Reposition microphone, or use a larger windscreen, or both.

2. Omni-directional mics produce less wind noise and breath pops
than directional types.

Hiss and Noise -- Audible Dropouts 1. Transmitter gain (audio level) far too low.

2. Receiver antenna missing or obstructed.

3. Operating distance too great.

4. RF interference. Reset both transmitter and receiver to a
clear channel. Use scanning function on receiver if available.

5. Musical instrument output set too low.

6. Microphone capsule picking up RF noise. See item on page 15
entitled Microphone RF Bypassing.

Excessive Feedback (With Microphone) 1. Transmitter gain (audio level) too high. Check gain adjustment
and/or reduce receiver output level.

2. Microphone too close to speaker system.

3. Microphone is too far from user’s mouth.

18

LECTROSONICS, INC.

Specifications and Features

Operating Frequencies: 470.000 - 691.175
Frequency Selection Steps: 25 kHz
RF Power output: 50 mW
Frequency Stability: ± 0.002%
Digital Modulation: 8 PSK
Spurious radiation: >90 dB below carrier
Equivalent input noise: –128 dBV
Input level: Nominal 2 mV to 300 mV, before limiting

Greater than 1V maximum, with limiting.
Input impedance: • Mic: 300 Ohm

• Line: 2k Ohm
Input limiter: Dual envelope type; 30 dB range
Gain control range: 44 dB in 1 dB steps; digital control
Modulation indicators: • Dual bicolor LEDs indicate modulation of

-20, -10, 0 and +10 dB referenced to full
modulation

• LCD bar graph
Controls: • Top panel toggle switch; programmable as

power, mute or none (off) function

• Side panel membrane switches with LCD
interface for power on/off and all setup and
configuration controls

Audio Input Jack: Switchcraft 5-pin locking (TA5F)
Antenna: Galvanized steel, flexible wire
Battery: Two AA Duracell Quantum recommended
Battery Life: 4.5 hours; Duracell Quantum alkaline
Weight: 6.24 ounces (177 grams), including two AA batteries

and wire belt clip
Dimensions: 3.2 x 2.5 x .74 in. (86 x 62 x 19 mm)
Emission Designator: 200KG1E

Digital Hybrid Wireless Belt-Pack Transmitter

Audio Performance (Digital Hybrid mode)

Frequency Response:
Mic input: 35 Hz to 20 kHz (+/-1dB); low frequency

roll-off is selectable at 35, 50, 70, 100, 120, 180 Hz
Line/Instrument: 35 Hz to 20 kHz (+/-1dB)

THD: 0.2% (typical)
SNR at receiver output:

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 figure for SNR without limiting by 4.5 dB

SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0

Specifications subject to change without notice.

For body worn operation, this transmitter model has been tested and meets the FCC RF exposure
guidelines when used with the Lectrosonics accessories supplied or designated for this product. Use of
other accessories may not ensure compliance with FCC RF exposure guidelines. Contact Lectrosonics
if you have any questions or need more information about RF exposure using this product..

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.

This device complies with Industry Canada radiation exposure limits as set forth for a controlled
“professional” use only.

Cet appareil est conforme avec les normes d’Industrie Canada concernant les limites d’exposition aux
radiations pour un usage professionnel contrôlé seulement.

Rio Rancho, NM

19

DBa

Service and Repair

If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment
needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnecting
cables and then go through the Troubleshooting section in this manual.

We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop at­tempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connection,
send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once set at the
factory, the various controls and trimmers do not drift with age or vibration and never require readjustment. There are
no adjustments inside that will make a malfunctioning unit start working.

LECTROSONICS’ Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs
are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest
flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does
to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone
for out-of-warranty repairs.

Returning Units for Repair

For timely service, please follow the steps below:

A. DO NOT return equipment to the factory for repair without first contacting us by email or by phone. We need

to know the nature of the problem, the model number and the serial number of the equipment. We also need a
phone number where you can be reached 8 A.M. to 4 P.M. (U.S. Mountain Standard Time).

B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed

your repair through our receiving and repair departments. The return authorization number must be clearly shown
on the outside of the shipping container.

C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the

proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed” for
safe transport.

D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam-

age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.

Lectrosonics USA:

Mailing address: Shipping address: Telephone:

Lectrosonics, Inc. Lectrosonics, Inc. [phone]
PO Box 15900 581 Laser Rd. [phone] Toll-free
Rio Rancho, NM 87174 Rio Rancho, NM 87124 [phone] Fax
USA USA

Web: E-mail:
www.lectrosonics.com [e-mail]

Lectrosonics Canada:

Mailing Address: Telephone: E-mail:

720 Spadina Avenue, [phone] Sales: [e-mail]
Suite 600 [phone] Toll-free Service: [e-mail]
Toronto, Ontario M5S 2T9 (877-7LECTRO)
[phone] Fax

20

LECTROSONICS, INC.

Digital Hybrid Wireless Belt-Pack Transmitter

Rio Rancho, NM

21

DBa

22

LECTROSONICS, INC.

Digital Hybrid Wireless Belt-Pack Transmitter

Rio Rancho, NM

23

LIMITED ONE YEAR WARRANTY

The 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.

581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
[phone] • [phone] • fax [phone] • [e-mail]

m

15 April 2016