Lectronics SMB/E01Series User manual

SMB/E01Series
Super Miniature Transmitters
With Digital Hybrid Wireless®Technology
SMDB/E01 Dual battery
SMB/E01 Single battery
RM Remote Control
INSTRUCTION MANUAL
Fill in for your records:
Serial Number:
Purchase Date: Rio Rancho, NM, USA
www.lectrosonics.com
US Patent 7,225,135

SMB/EO1 Series
LECTROSONICS, INC.
2
Introduction
The SMB Series transmitters are the product of many
years of engineering and experience in professional
audio markets. The unique design provides several
distinct features for professional applications:
s 3UPERBCOMPANDORFREEAUDIOQUALITY
s 5LTRALIGHTWEIGHTCORROSIONRESISTANTHOUSING
s 7ATERRESISTANTSEALSFORUSEINDAMPENVIRON
ments
s 0ROGRAMMABLECOMPATIBILITYMODESFORUSEWITHA
wide variety of different receivers
4HE$IGITAL(YBRID7IRELESS®design (US Patent
COMBINESBITDIGITALAUDIOWITHANALOG
FM resulting in a system that has the same operating
range as analog systems, the same spectral effi
ciency as analog systems, the same long battery life
as analog systems, plus the excellent audio fidelity
typical of pure digital systems.
The transmitters feature the unique servo bias input
circuitry with a standard TA5M type input jack for use
with electret lavaliere mics, dynamic mics, or line level
signals. A water resistant control panel with LCD,
MEMBRANESWITCHESANDMULTICOLOR,%$SMAKEINPUT
gain adjustments, frequency and compatibility mode
selection quick and accurate, without having to view
the receiver. The battery compartment accepts AA
lithium or rechargeable batteries. The housings are
machined from solid aluminum blocks to provide an
extremely lightweight and rugged package. A special
NONCORROSIVElNISHRESISTSSALTWATEREXPOSUREAND
perspiration in extreme environments.
4HE$30BASEDDESIGNWORKSWITH%UROVERSION$IGI
tal Hybrid and IFB receivers.
Table of Contents
Introduction.......................................................................... 2
General Technical Description ........................................... 4
Servo Bias Input................................................................. 4
.O0RE%MPHASIS$E%MPHASIS ........................................ 4
,OW&REQUENCY2OLL/FF ..................................................... 4
Input Limiter ....................................................................... 4
3IGNAL%NCODINGAND0ILOT4ONE ......................................... 5
Microprocessor Control...................................................... 5
Compatibility Modes........................................................... 5
Control Panel ..................................................................... 5
"ATTERY/PTIONSAND/PERATING4IME ................................. 5
Frequency Blocks............................................................... 5
#IRCULATOR)SOLATOR............................................................... 5
Controls and Functions ...................................................... 6
LCD Screen ....................................................................... 6
0OWER,%$ ......................................................................... 6
Audio Input Jack................................................................. 6
!5$)/"UTTON .................................................................... 6
&2%1"UTTON...................................................................... 6
5P$OWN!RROWS ................................................................ 6
Antenna.............................................................................. 6
Setup Screens...................................................................... 7
Audio Screen ..................................................................... 7
Frequency Screen.............................................................. 7
,OCK5NLOCK3CREEN ........................................................... 7
2EMOTE#ONTROL/PERATION ................................................. 7
Configuring for Power Restore........................................... 7
Battery Installation .............................................................. 8
Operating Instructions ........................................................ 8
Power Up and Boot Sequence........................................... 8
Power Down....................................................................... 8
Standby Mode.................................................................... 9
Selecting the Compatibility Mode
AND/UTPUT0OWER .............................................................. 9
3ETTING4RANSMITTER/PERATING&REQUENCY........................... 9
Adjusting Audio Level (Gain)............................................ 10
Locking or Unlocking the Controls ................................... 10
Attaching and Removing the Microphone........................ 11
5-Pin Input Jack Wiring ..................................................... 12
Installing the Connector: .................................................. 12
!UDIO)NPUT*ACK7IRING.................................................... 12
Microphone Cable Termination
for Non-Lectrosonics Microphones.......................... 13
Microphone RF Bypassing............................................... 14
Line Level Signals............................................................ 14
Wiring Hookups for Different Sources ............................ 15
Optional RM Remote Control ........................................... 16
Powering the RM on and off............................................. 16
Setup Screens ................................................................. 16
/PERATING.OTES............................................................... 17
2-1UICK2EFERENCE........................................................ 17
Troubleshooting................................................................. 18
RM Troubleshooting ......................................................... 19
Included Accessories........................................................ 20
Optional Accessories........................................................ 20
Whip Antennas .................................................................. 21
Specifications and Features............................................. 22
Service and Repair ............................................................ 23
Returning Units for Repair ............................................... 23

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 3

SMB/EO1 Series
LECTROSONICS, INC.
4
Variable 1.8 - 4v
+6V
+5V 5V
Regulator
Servo Bias Input
The voltage and current requirements of the wide
variety of electret microphones used in professional
applications has caused confusion and compromises
in the wiring needed for wireless transmitters. To ad
dress this problem, the unique Servo Bias input circuit
provides an automatically regulated voltage over a
very wide range of current for compatibility with all
microphones.
Digital Hybrid Wireless®Technology
All wireless links suffer from channel noise to some
degree, and all wireless microphone systems seek to
minimize the impact of that noise on the desired sig
nal. Conventional analog systems use compandors for
enhanced dynamic range, at the cost of subtle artifacts
TYPICALLYhPUMPINGvANDhBREATHINGv7HOLLYDIGITALSYS
tems defeat the noise by sending the audio information
in digital form, at the cost of some combination of power,
bandwidth and resistance to interference.
Digital Hybrid systems overcome 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 information 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.
Because it uses an analog FM link, the Digital Hybrid
system enjoys all the benefits of conventional FM
wireless systems and it does away with the analog
compandor and its artifacts.
General Technical Description
No Pre-Emphasis/De-Emphasis
4HE$IGITAL(YBRIDDESIGNRESULTSINASIGNALTONOISE
ratio high enough to preclude the need for conventional
PREEMPHASIS(&BOOSTINTHETRANSMITTERANDDE
emphasis (HF roll off) in the receiver. This eliminates
the potential for distortion of signals with abundant
HIGHFREQUENCYINFORMATION
Low Frequency Roll-Off
4HELOWFREQUENCYROLLOFFCANBESETFORAD"DOWN
point at 35, 50, 70, 100, 120 and 150 Hz to control
subsonic and very low frequency audio content in
THEAUDIO4HEACTUALROLLOFFFREQUENCYWILLVARYSLIGHTLY
depending upon the low frequency response of the
microphone.
%XCESSIVELOWFREQUENCYCONTENTCANDRIVETHETRANS
mitter into limiting, or in the case of high level sound
systems, can even cause damage to loudspeaker
SYSTEMS4HEROLLOFFISNORMALLYADJUSTEDBYEAR
while listening as the system is operating.
Input Limiter
!$30CONTROLLEDANALOGAUDIOLIMITERISEMPLOYED
BEFORETHE!$CONVERTER4HE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 distortion. 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 tran
sients, with no audible side effects, and also recov
ers slowly from sustained high levels to keep audio
distortion low while preserving short term dynamics.

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 5
Signal Encoding and Pilot Tone
In addition to controlling the limiter, the DSP also en
CODESTHEDIGITIZEDAUDIOFROMTHE!$CONVERTERAND
adds an ultrasonic pilot tone to control the squelch
in the receiver. A pilot tone squelch system provides a
reliable method of keeping a receiver output muted
when the squelch is active, even in the presence of
SIGNIlCANTINTERFERENCE7HENTHESYSTEMISOPERATING
in the hybrid mode, a different pilot tone frequency
is generated for each carrier frequency to prevent
SQUELCHPROBLEMSINMULTICHANNELSYSTEMS
Microprocessor Control
A microprocessor monitors user command inputs
from the control panel buttons and numerous other
internal signals. It works intimately with the DSP to
ensure the audio is encoded according to the select
ed Compatibility Mode and that the correct pilot tone
is added to the encoded signal.
Compatibility Modes
SMB transmitters are designed to operate with Lec
trosonics Digital Hybrid receivers and will yield the
best performance when doing so, however, due to the
flexibility of digital signal processing, they can also
OPERATEWITH,ECTROSONICS%UROVERSION)&"RECEIVERS
Control Panel
The control panel includes four membrane switches and
AN,#$SCREENTOADJUSTTHEOPERATIONALSETTINGS-ULTI
COLOR,%$SAREUSEDTOINDICATEAUDIOSIGNALLEVELSFOR
accurate gain adjustment and for battery status.
Battery Options and Operating Time
Switching power supplies convert regulated battery
voltages to operate various circuit stages with maxi
MUMEFlCIENCY7ITHTHEVARIETYOFALKALINELITHIUM
and rechargeable NiMH batteries available today in
the AA format, there are many choices to maximize
operating time or minimize cost as needed for any
application.
The firmware “remembers” the power status when a
battery fails or power is disconnected, so the trans
mitter will be turned on automatically when power is
restored and previous settings will be enabled.
Frequency Blocks
Lectrosonics established a “block” numbering system
years ago to organize the range of frequencies that
are available. Legacy transmitters and receivers used
two binary switches, each with 16 positions, to set the
operating frequency. 16 x 16 = 256, which defined the
standard number of frequencies in each block to be
256. Since the steps between frequencies is 100 kHz,
this results in a switching range of 25.6 MHz.
The lowest frequency in the switching range di
vided by 25.6 yields the block number. For example,
640.000 divided by 25.6 equals 25. In other words,
block 25 starts at 640.000 MHz.
To determine what block a particular frequency falls
into, divide the frequency and use the two significant
digits to the left of the decimal. For example, to cal
culate the block for 580.500 MHz, divide 580 by 25.6,
which equals 22.656, which indicates block 22.
Circulator/Isolator
4HE2&OUTPUTCIRCUITINCLUDESAONEWAYCIRCULATOR
isolator using a magnetically polarized ferrite. This
device greatly reduces RF intermodulation produced
when multiple transmitters are used in close proximity
to one another (a meter or two, or less). The isolator
also protects the output amplifier against static shock.

SMB/EO1 Series
LECTROSONICS, INC.
6
Controls and Functions
LCD Screen
4HE,#$ISANUMERICTYPE,IQUID#RYSTAL$ISPLAYWITH
screens for adjusting power, frequency, audio level
ANDLOWFREQUENCYAUDIOROLLOFF4HETRANSMITTERCAN
be powered up with or without the RF output turned
on. A countdown appears in the LCD when powering
on and off, allowing the transmitter to be turned on
without RF for adjustments, and to prevent acciden
tally turning it off with momentary button presses.
Power LED
4HE072,%$GLOWSGREENWHENTHEBATTERYISGOOD
4HECOLORCHANGESTOREDATAMIDPOINTOFOPERATING
life, and will continue to glow red until the battery gets
CLOSETOTHEENDOFITSLIFE7HENTHE,%$BEGINSTO
blink red, there are only a few minutes remaining.
4HEEXACTPOINTATWHICHTHE,%$TURNSREDWILLVARY
with battery brand and condition, temperature and
CURRENTDRAIN4HE,%$ISSIMPLYAREMINDERINTENDED
to catch your attention, not an exact indicator of re
maining time.
1.6
1.4
1.2
1.0
.8 2468
Hours
Voltage
Varies
Green Red Blink
Example of AA lithium battery in SMB transmitter
A NiMH rechargeable battery will give little or no
warning when it is depleted because the voltage does
not vary much during its operating life. If you wish
to use NiMH batteries, we recommend trying fully
charged batteries in the unit and using the battery
timer feature available in most receivers to determine
the available operating time.
!WEAKBATTERYWILLSOMETIMESCAUSETHE072,%$
to glow green immediately after the transmitter is
turned on, but the battery will soon discharge to the
POINTWHERETHE,%$WILLTURNREDORTHEUNITWILLTURN
OFFCOMPLETELY7HENTHETRANSMITTERISIN3,%%0
MODETHE,%$BLINKSGREENEVERYFEWSECONDS
Audio Input Jack
The Servo Bias input circuitry accommodates virtu
ally every lavaliere, handheld or shotgun microphone
available, plus line level signals.
Modulation LEDs
Proper input gain adjustment is critical to ensure the
BESTAUDIOQUALITY4WOBICOLOR,%$SWILLGLOWEITHER
red or green to accurately indicate modulation levels.
The input circuitry includes a wide range DSP con
trolled limiter to prevent distortion at high input levels.
It is important to set the gain (audio level) high
enough to achieve full modulation during louder peaks
in the audio. The limiter can handle over 30 dB of level
above full modulation, so with an optimum setting,
THE,%$SWILLmASHREDDURINGUSE)FTHE,%$SNEVER
flash red, the gain is too low. In the table below, +0 dB
indicates full modulation.
Signal Level -20 LED -10 LED
,ESSTHAND" /FF /FF
D"TOD" Green /FF
D"TOD" Green Green
+0 dB to +10 dB Red Green
Greater than +10 db Red Red
AUDIO Button
4HE!5$)/BUTTONISUSEDTODISPLAYTHEAUDIOLEVEL
ANDLOWFREQUENCYROLLOFFSETTINGS4HE50AND
$/7.ARROWSADJUSTTHEVALUES
4HE!5$)/BUTTONISALSOUSEDWITHTHE&2%1BUTTONTO
enter standby mode and to turn the transmitter on or off.
FREQ Button
4HE&2%1"UTTONDISPLAYSTHESELECTEDOPERATINGFRE
quency and also toggles the LCD between displaying
THEACTUALOPERATINGFREQUENCYIN-(ZANDATWODIGIT
hexadecimal number that corresponds to the equiva
lent Lectrosonics Frequency Switch Setting.
4HE&2%1BUTTONISALSOUSEDWITHTHE!5$)/BUTTONTO
enter standby mode and to turn the transmitter on or off.
Up/Down Arrows
The Up and Down arrow buttons are used to select
the values on the various setup screens and to lock
out the control panel. Pressing both arrows simultane
OUSLYENTERSTHELOCKCOUNTDOWN7HENANATTEMPTIS
made to change a setting while the control panel is
locked, a message will flash on the LCD reminding
YOUTHATTHEUNITISLOCKED/NCELOCKEDTHEBUTTONS
can only be unlocked by removing the battery, or via
the RM remote control (if the remote function was
enabled in the transmitter setup).
Antenna
The transmitter uses a whip antenna with a flexible
woven, galvanized steel mesh cable and a standard
SMA connector.
Battery
Compartment
Retaining
Screw
Battery
Compartment
Cover Plate
Audio
Input Jack
AUDIO Button
LCD
FREQ Button
Modulation
LEDs
PWR LED
UP Arrow
DOWN Arrow
Antenna
Jack

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 7
Setup Screens
Audio Screen
The Audio screen is used
to adjust input gain from 0
to +44 dB, and the low
FREQUENCYROLLOFFFROM
to 150 Hz. Repeatedly
PRESSINGTHE!5$)/
button toggles back and
forth between the two
DISPLAYS0RESSANDHOLDTHE!5$)/BUTTONANDUSE
the Up and Down arrows to make adjustments.
Frequency Screen
The Frequency Screen
displays the operating
frequency in MHz or as a
TWODIGITHEXADECIMAL
number that corresponds
to the equivalent Lectro
sonics Frequency Switch
Setting. Repeatedly
PRESSINGTHE&2%1BUTTONTOGGLESBETWEENTHETWO
DISPLAYS0RESSANDHOLDTHE&2%1BUTTONANDUSE
the Up and Down arrows to select the frequency.
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.
7HENTHETIMERREACHESZEROTHETRANSMITTERS
controls are locked.
7ITHTHECONTROLSLOCKEDTHE!5$)/AND&2%1BUT
tons can still be used to display current settings. Any
attempt to change a setting by pressing either the Up
OR$OWNARROWBUTTONWILLRESULTINANONSCREENLoc
reminder that the controls are locked. Remove the
batteries to unlock the control panel.
Important: Once the transmitter is locked, it
cannot be unlocked or powered off using the
buttons.The only ways to unlock a locked
transmitter are to remove the battery or unlock
it using the RM remote control if this function is
enabled on the transmitter.
Remote Control Operation
Remote Control Screens
The transmitters can be
configured to respond to
signals from the RM
remote control unit or to
ignore them. This setting
is accessed by holding
down the Down arrow
button while powering the
transmitter on.
If a remote control signal is detected but the trans
mitter is set to rc oFF, the message rc oFF will be
DISPLAYEDBRIEmYONTHETRANSMITTERS,#$TOCONlRM
that a valid signal was received, but that the transmit
ter is not configured to respond to it.
Functions available from the remote control are:
s !UDIO,EVEL
s &REQUENCY
s ,OCK5NLOCK"UTTONS
s 3LEEP7AKEPOWERSAVINGMODE
In sleep mode, the transmitter uses only 20% of the
normal amount of battery drain. Sleep mode can only
be invoked with the remote control, and can only be
revoked with the remote control or by removing the
BATTERY7HENINTHESLEEPMODETHE072,%$BLINKS
green every few seconds to indicate that the transmitter
is asleep and not turned off.
The RM is not included with SM Series transmitters.
Several “Dweedle tones” can also be downloaded
from the web site at:
HTTPWWWLECTROSONICSCOMHYBRIDRMRMHTML
The dweedle tones can be played back through an
MP3 player, PDA, smart phone, etc., and in most
cases, will even work with walkie talkies. The tones
will not work through the loudspeakers of a sound
system because the reflections and reverberation in
the room will alter the tones.
Configuring for Power Restore
Power Restore Screens
The Power Restore feature
will turn the transmitter
back on with the same
settings that were enabled
in the previous use after a
battery is replaced or
external power has been
cycled off and back on.
1) Press and hold the Down Arrow Button then
power on the transmitter by pressing the
Audio and Freq buttons simultaneously.
2) Press AUDIO or FREQ key to scroll to the setting
and then use the arrow keys to select PbAc 1 for
/.ORPbAc 0FOR/&&

SMB/EO1 Series
LECTROSONICS, INC.
8
Operating Instructions
Power Up and Boot Sequence
1) %NSURETHATGOODBATTERIESAREINSTALLEDINTHE
unit.
2) 3IMULTANEOUSLYPRESSANDHOLDTHE!5$)/AND
&2%1BUTTONSUNTILTHE0OWER/N"OOT3EQUENCE
is initiated. As the unit turns on, the Modulation
,%$SAND072,%$ALLGLOWREDTHENGREENAND
then revert to normal operation.
AUDIO
Button
FREQ
Button
Modulation LEDs
PWR LED
The LCD displays a bootup sequence which con
sists of four screens similar to these examples:
Company Name: Lectro
Frequency Block (bXX) and
Firmware Version (rX.X): b21r1.1
Power Level Pr 50
Compatibility Mode: CP Hbr
Audio: Aud 22
Power Down
Initial Power Off
Timer Screen
1) 3IMULTANEOUSLYPRESSANDHOLDTHE!5$)/AND
&2%1BUTTONSWHILEOBSERVINGTHATTHEWORDOFF
appears in the LCD along with a counter.
2) Continue holding the buttons in until the counter
reaches 0, and the unit will then turn off.
.OTE)FTHE!5$)/AND&2%1BUTTONSARE
released before the LCD goes blank at the
end of the countdown, the unit will not turn off.
Instead, it will stay energized and the display will
return to the previous screen.
Battery Installation
.OTE3TANDARDZINCCARBONBATTERIESMARKED
“heavy-duty” or “long-lasting” are not
adequate.
The battery status circuitry is designed for the voltage
drop over the life of lithium batteries.
To install new batteries:
1. Turn the Battery Cover Plate Thumbscrew coun
terclockwise, a few turns until the door will rotate.
2. Insert the new batteries into the housing. The
positive (+) battery terminal goes into the trans
mitter first.
3. Align the Battery Cover Plate and tighten the Bat
tery Cover Plate Thumbscrew.
Two battery
compartments
(SMDB)
Kevlar
covered vent
./4%2EFERTOTHEPREVIOUSSECTIONENTITLED
Configuring for Power Restore

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 9
Setting Transmitter Operating Frequency
Frequency displayed
in MHz
Frequency displayed as
two-digit hexadecimal
number
The frequency can be
displayed either in MHz or
ASATWODIGITHEXADECIMAL
number and can be set in
the Standby Mode or
when the transmitter is
powered up. The hexa
decimal numbering
system is unique to
Lectrosonics where two
alphanumeric characters
correspond to the left and
right switch settings on earlier analog transmitters that
used mechanical rotary switches to adjust frequency.
The hexadecimal notation is also easier to remember
than a six character frequency and is supported on
the receiver LCD.
1) 0RESSTHE&2%1BUTTONTOSELECTEITHERTHE-(Z
screen or the hexadecimal screen.
2) 7HILEHOLDINGTHE&2%1BUTTONUSETHE5POR
Down arrow buttons to move the operating fre
quency up or down from the current setting.
Note: The operating frequency displayed on the
LCD wraps as it reaches the upper or lower end
of its range.
Adjusting the Low Frequency Roll-off
2EPEATEDLYPRESSTHE!5$)/BUTTONUNTILTHE,&ROLL
off adjustment screen appears. Then press and hold
THE!5$)/BUTTONWHILESELECTINGTHEDESIREDROLLOFF
FREQUENCYWITHTHE50AND$/7.ARROWS
4HEROLLOFFFREQUENCYCANBESETTO
120 and 150 Hz.
Standby Mode
Standby Screen
0RESSTHE!5$)/AND
&2%1BUTTONSBRIEmYTO
place the unit in Standby
Mode. In this mode the RF
output is turned off so all
setup adjustments can be made without interfering
with other systems operating in the same location.
The screen displays rf OFF to remind the user that
the unit is not transmitting.
7HILETHEUNITISINTHESTANDBYMODEACCESSTHESET
UPSCREENSUSINGTHE!5$)/AND&2%1BUTTONSAND
make adjustments using the Up and Down arrows.
Selecting the Compatibility Mode
and Output Power
Digital Hybrid Wireless®
compatibility mode
IFB compatibility mode
The transmitters will work
with Digital Hybrid and IFB
analog receivers. The unit
automatically enters the
Standby Mode when
selecting compatibility.
3ETTHERECEIVERSAUDIO
controls to minimum.
2) From a power off con
dition, hold down the Up
arrow, then simultaneously
PRESSTHE!5$)/AND&2%1BUTTONS
3) 0RESSEITHER!5$)/OR&2%1BUTTONTOSELECTTHE
compatibility screen and use the Up and Down ar
rows to select the desired mode.
The following Compatibility Modes are available:
 s $IGITAL(YBRIDMODE #0(BR
 s )&"3ERIESMODE #0)&B
4) 3IMULTANEOUSLYPRESSTHE!5$)/AND&2%1BUT
tons to exit this mode and turn off the power.`

SMB/EO1 Series
LECTROSONICS, INC.
10
Adjusting Audio Level (Gain)
4HECONTROLPANEL-ODULATION,%$SINDICATETHEAUDIO
LEVELANDLIMITERACTIVITY/NCESETTHETRANSMITTERS
audio level setting should not be used to control the
volume of your sound system or recorder levels. This
gain adjustment matches the transmitter gain with the
MICROPHONESOUTPUTLEVELTHEUSERSVOICELEVELAND
the position of the microphone. The audio input level
(gain) is adjusted with the unit in the Standby Mode or
WHILEPOWEREDUPWHILEOBSERVINGTHE,%$S
It is desirable to to set the gain so that some limiting
occurs on louder peaks. The limiter is very transparent
and its effect is not audible until the system is close to
OVERLOAD)NOTHERWORDSDONTBESHYABOUTTURNING
up the gain. In fact, it is a good idea to turn the gain
up to maximum and listen for distortion or compres
sion to get a feel for how much headroom the system
actually has.
Signal Level -20 LED -10 LED
,ESSTHAND" /FF /FF
D"TOD" Green /FF
D"TOD" Green Green
+0 dB to +10 dB Red Green
Greater than +10 db Red Red
Note: Different voices will usually require
different gain settings, so check this adjustment
as each new person uses the system. 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) 7ITHTHETRANSMITTERPOWEREDOFFPLUGINTHEMI
crophone and make sure the connector is firmly
seated.
Warning: If the systems is powered up while
connected to a live sound system, be careful
to turn the sound system level down first or
severe feedback can occur.
2) Place the transmitter in Standby Mode or turn it
on for normal use.
3) Position the microphone in the location where it
will be used in actual operation.
4) /BSERVETHE-ODULATION,%$SWHILESPEAKINGOR
singing into the microphone at the same voice
LEVELTHATWILLBEUSEDDURINGUSE7HILEHOLDING
THE!5$)/BUTTONPRESSTHE50OR$/7.ARROW
BUTTONSUNTILTHEBOTHTHEAND,%$SGLOW
GREENWITHTHE,%$OCCASIONALLYmICKERING
red. This will maximize the signal to noise ratio of
the system with full modulation and provide subtle
limiting to prevent overload and audible compres
sion.
5) If the unit was set up in Standby Mode, it will be
necessary to turn the transmitter off, then power it
up again in normal operation so the RF output will
be on. Then the other components in the sound or
recording system can be adjusted.
Locking or Unlocking the Controls
Control Panel Locked
The Lock mode protects
the transmitter from
accidental changes to its
settings.
Simultaneously press both
the Up and Down arrow buttons to start the count
DOWNTIMER7HENTHETIMERREACHESZEROh,OCvIS
displayed and the controls are locked. Settings can be
reviewed but not changed.
/NCETHETRANSMITTERISLOCKEDITCANNOTBEUNLOCKEDOR
powered off using the buttons. The only ways to unlock
a locked transmitter are to remove the battery or unlock
it using the remote control. The remote control will work
only if the transmitter was previously configured to
respond to the remote control. The unit will always
power up in “unlocked” mode.

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 11
Attaching and Removing the Microphone
4HEmEXIBLESLEEVEOVERTHEPINPLUGONTHEMICRO
phone helps prevent dust and moisture from getting
into the input jack. A flange is machined into the rim
of the connector on the transmitter to help retain the
sleeve after it is installed.
The following procedure simplifies the attachment and
removal of the microphone to assure the sleeve is
seated securely.
Align the pins on the plug and jack and insert the con
nector.
1
If the sleeve is pulled down and covering the connec
tor, squeeze the end of the sleeve so you can feel
the connector inside and press it into the jack until it
latches.
Pinch and squeeze the sleeve near the flange and
work it down with a kneading motion over the flange
all the way around until it stays in place flush with the
housing. Pull on the connector to make sure it is firmly
latched.
Pinch and
squeeze the
sleeve on this end
to work it down
over the flange.
2
To remove the connector, pull the sleeve back to
expose the black release button. Press the button to
unlatch the plug.
3
Release button

SMB/EO1 Series
LECTROSONICS, INC.
12
The wiring diagrams included in this section repre
sent 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3ERVICEAND
Repair in this manual or visit our web site at:
www.lectrosonics.com
SM Equivalent Input Circuit Wiring
10k
1k
5
4
3
2
1
To Virtual Ground
Audio Amplifier
BIAS
MIC
BIAS SELECT
LINE IN
GND
+30uF
+5 VDC
Servo Bias
Pin 4 to Pin 1 = 0 V
Pin 4 Open = 2 V
Pin 4 to Pin 2 = 4 V
+
To Limiter Control
30uF
500 Ohm
100 Ohm
2.7K
200 Ohm
+
3.3uF
100 Ohm
5-Pin Input Jack Wiring
Audio input jack wiring:
s 0). 3HIELDGROUNDFORPOSITIVEBIASED
electret lavaliere microphones. Shield (ground) for
dynamic microphones and line level inputs.
s 0). "IASVOLTAGESOURCEFORPOSITIVEBIASED
electret lavaliere microphones.
s 0). ,OWIMPEDANCEMICROPHONELEVELINPUT
FORDYNAMICMICROPHONES!LSOACCEPTSHANDHELD
electret microphones provided the microphone
HASITSOWNBUILTINBATTERY
s 0). "IASVOLTAGESELECTORFOR0IN0INVOLT
age (0, 2 or 4 volts) depends on Pin 4 connection.
Pin 4 tied to Pin 1: 0 V
 0IN/PEN 6
Pin 4 to Pin 2: 4 V
s 0). (IGHIMPEDANCELINELEVELINPUTFORTAPE
decks, mixer outputs, musical instruments, etc.
Installing the Connector:
1) If necessary, remove old connector from micro
phone cable.
2) Slide Rubber Boot onto microphone cable with the
large end facing away from the microphone. (See
illustration above.)
 )FNECESSARYSLIDETHEINCHBLACKSHRINKTUBING
onto the mircrophone cable. (This tubing is needed
for some cables to ensure the cable fits snugly in
the rubber boot.)
4) Use the resistors and connector included with this
kit to configure the TA5F to your particular micro
PHONE!LENGTHOF/$CLEARTUBINGISINCLUDED
if insulating the resistor leads or shield wire is
necessary. (Remove rubber strain relief from con
nector backshell by pulling it out of the backshell.)
5) Slide the Strain Relief over the TA5F Insert and
crimp as shown to the right. Then insert the TA5F
Insert and Strain Relief in the TA5F Latchlock.
Screw the TA5F Flex Relief onto the TA5F Latch
lock.
 )FNEEDEDPOSITIONANDSHRINKTHEINCHSHRINK
tubing on the microphone cable, then slide the Rub
ber Boot down over the TA5F connector.
TA5F Latchlock Insert
Insulator Cable clamp
TA5F Backshell
with Strain Relief
Remove strain relief
if using dust boot
TA5F Backshell
(Strain Relief
removed) 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.

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 13
./4%4HISTERMINATIONISINTENDEDFOR5(&
transmitters only. VHF transmitters with
PINJACKSREQUIREADIFFERENTTERMINATION
Lectrosonics lavaliere microphones are
terminated for compatibility with VHF and
UHF transmitters, which is different than
what is shown here.
Microphone Cable Termination
for Non-Lectrosonics Microphones
TA5F Connector Assembly
Mic Cord Stripping Instructions
1
23
4
5
VIEW FROM SOLDER
SIDE OF PINS
0.3"
0.15"
Crimping to Shield and Insulation
Shield
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.
Crimp these
fingers to
contact the
shield
Crimp these
fingers to
clamp the
insulation

SMB/EO1 Series
LECTROSONICS, INC.
14
Microphone RF Bypassing
7HEN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
THEMICROPHONETRANSMITTERCOMPATIBILITY)FTHEELECTRET
microphone is not designed properly for use with wire
less 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 (see
schematic diagram).
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 con
nector housing.
Install the capacitors as follows: Use 330 pF ca
pacitors. Capacitors are available from Lectrosonics.
Please specify the part number for the desired lead
style.
 ,EADEDCAPACITORS 0. 
 ,EADLESSCAPACITORS0.3##0
All Lectrosonics lavaliere mics are already bypassed
and do not need any additional capacitors installed for
proper operation.
Line Level Signals
The normal hookup for line level signals is:
 s 3IGNAL(OTTOPIN
 s 3IGNAL'NDTOPIN
 s 0INJUMPEDTOPIN
This allows signal levels up to 3V RMS to be applied
without limiting.
If more headroom is needed, insert a 20 k resistor in
series with pin 5. Put this resistor inside the TA5F con
nector to minimize noise pickup.
3 WIRE MIC2 WIRE MIC
CAPSULE CAPSULE
SHIELD
AUDIO
SHIELD
AUDIO
BIAS
Alternate locations for bypass capacitors
TA5F
CONNECTOR
TA5F
CONNECTOR
Preferred locations for bypass capacitors

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 15
BALANCED AND FLOATING LINE LEVEL SIGNALS
*NOTE: If the output is balanced but center
tapped to ground, such as on all Lectrosonics
receivers, do not connect Pin 3 of the XLR jack
to Pin 4 of the TA5F connector.
TA5F
PLUG
XLR JACK
Fig. 7
Compatible Wiring for Both Servo Bias Inputs and Earlier Transmitters:
Simple Wiring - Can ONLY be used with
Servo Bias Inputs:
Wiring Hookups for Different Sources
In addition to the microphone and line level wiring
hookups illustrated below, Lectrosonics makes a num
ber of cables and adapters for other situations such
as connecting musical instruments (guitars, bass
guitars, etc.) to the transmitter. Visit www.lectroson-
ics.com and click on Accessories, or download the
master catalog.
A lot of information regarding microphone wiring is
ALSOAVAILABLEINTHE&!1SECTIONOFTHEWEBSITEAT
http://www.lectrosonics.com/faq.htm
Follow the instructions to search by model number or
other search options.
1
2
3
4
5
PIN
SHIELD
AUDIO 1
2
3
4 5
TA5F
PLUG
3.3 k
1.5 k
2 VOLT POSITIVE BIAS 2-WIRE ELECTRET
Compatible wiring for microphones such as
Countryman E6 headworn and B6 lavaliere.
Fig. 1
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. 2
SHIELD
TIP
PIN
5
4
3
2
1
SLEEVE
LINE LEVEL
RCA or 1/4” PLUG
AUDIO 1
2
3
4 5
TA5F
PLUG
UNBALANCED LINE LEVEL SIGNALS
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).
Fig. 8
1
2
3
4
5
PIN
SHIELD
AUDIO
1
2
3
4 5
TA5F
PLUG
2.7 k
2 VOLT NEGATIVE BIAS 2-WIRE ELECTRET
Compatible wiring for microphones
such as negative bias TRAM models.
NOTE: The resistor value can range from 2k to 4k ohms.
Fig. 4
DRAIN (BIAS)
SOURCE (AUDIO)
SHIELD
4 VOLT POSITIVE BIAS 3-WIRE ELECTRET
WITH EXTERNAL RESISTOR
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.
Used for 3-wire lavaliere
microphones that require an
external resistor such as the
Sanken COS-11.
Fig. 5
Fig. 11
4 VOLT POSITIVE BIAS 3-WIRE ELECTRET
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.
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. 9
Fig. 3
DPA MICROPHONES (Danish Pro Audio miniature models)
This wiring is for DPA lavalier
and headset microphones.
NOTE: The resistor value can range from 3k to 4k ohms.
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. 6
LO-Z MICROPHONE LEVEL SIGNALS
For low impedance dynamic mics or electret
mics with internal battery or power supply.
XLR JACK
Insert 1k resistor in series with pin 3 if attenuation is needed

SMB/EO1 Series
LECTROSONICS, INC.
16
Optional RM Remote Control
The RM unit gives you remote control of SM Series
transmitters using an audible tone delivered to the mi
crophone. The panel layout is the same as the trans
mitters. Simply set the desired value or mode on the
LCD, then press the send button to set the transmitter
to the same setting or mode.
Hold the speaker on the RM close to the microphone
when pressing the pushbutton. A “dweedle” tone will
play from the RM speaker into the microphone and
the parameter on the transmitter will be set immedi
ately.
Available adjustments:
s !UDIOINPUTGAIN
s &REQUENCY
s ,OCKOR5NLOCK-ODES
s 3LEEP-ODE/./&&
Send Button
Speaker
7HENTHETRANSMITTERISINTHEPOWERSAVINGSLEEP
mode, it uses only 20% of the normal battery drain,
so battery life with be 5 times longer. This is especially
useful in situations where the transmitter is buried
deep inside costuming and there are waiting periods
between use. The transmitter can “sleep” for several
hours and then be awakened and adjusted when the
production is about to begin.
Powering the RM on and off
4OTURNTHE2-ONOROFFPRESSTHE!5$)/AND&2%1
buttons together briefly. The unit powers up on the
page that was displayed when the unit was powered
off last.
4HESETUPSCREENSAREACCESSEDWITHTHE!5$)/AND
&2%1BUTTONS/NCEONTHEDESIREDSCREENTHEVALUE
ISADJUSTEDWITHTHE50AND$/7.ARROWBUTTONS
4OCHANGEATRANSMITTERSSETTINGVIATHE2-SELECT
THESCREENANDVALUETHENPRESSTHE3%.$BUTTON
while holding the speaker close to the microphone.
The speaker should be uncovered and held within a
FEWINCHESOFTHETRANSMITTERSMICROPHONE4HELON
gest usable range is about 6 feet, depending on the
microphone and volume settings used.
/NLYTHESPECIlCFUNCTIONDISPLAYEDISALTERED&OR
example, if the remote control is on the Aud (audio
LEVELGAINSCREENPRESSINGTHESENDBUTTONWILLSET
the gain on the transmitter but will not affect any other
setting.
Setup Screens
4HE!5$)/BUTTONCYCLESTHROUGHSCREENS
1) !UDSETTRANSMITTERSAUDIOLEVEL
2) 3,%%0UN3,0CAUSETRANSMITTERTOSLEEPORWAKE
up
3) ,OCUN,OCLOCKORUNLOCKTRANSMITTERSBUTTONS
4) ,OUDADJUST2-SPEAKERVOLUME
PRESS3%.$BUTTONFORASAMPLETONE
4HE&2%1BUTTONCYCLESTHROUGHORSCREENS
depending on the settings:
1) #(SETTRANSMITTERSCHANNEL
USINGBLOCKINDEPENDENTHEXCODE
2) BSELECTABLOCKNUMBER
(optional — uncovers next page)
3) SETTRANSMITTERSFREQUENCYIN-(Z
(avail. if a block is selected)
A single AA Lithium battery will operate
the RM for up to several years. Unscrew
the knurled knob for access to the battery
compartment.

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 17
Operating Notes
s 4HESENSITIVITYTOTHE
remote control varies with
THETRANSMITTERSAUDIO
level setting and the
microphone used, but it is
always possible to make
it work with a sufficiently
loud remote signal at
close range.
s )FTHETRANSMITTERISCON
figured to respond to the
remote control, it will do
so even if the buttons are
locked.
s 7HENTHETRANSMITTERIS
asleep, it can only be
awakened by the remote
control, or by removing
and reinserting the bat
tery.
s 7HENTHETRANSMITTERISASLEEPTHE072LED
blinks green every few seconds.
s )FAREMOTECOMMANDISSENTTHATWOULDRESULTIN
the same display being shown again on the trans
mitter (for example tuning to the channel already
displayed), a row of dashes is displayed briefly,
as a signal that the command was received, but it
DIDNTCHANGEANYTHING
s )FYOUAREHAVINGTROUBLEGETTINGTHETRANSMIT
TERTORESPONDMAKESUREYOUARENTCOVERING
THESPEAKERWITHYOURTHUMBANDORTURNUPTHE
speaker volume on the Loud page.
s )FTHE2-ISSETTOADIFFERENTBLOCKNUMBERTHAN
the transmitter and an attempt is made to set the
TRANSMITTERSFREQUENCYIN-(ZTHECOMMAND
will still work. The transmitter is simply set to the
corresponding channel in the correct block, with a
matching hexadecimal number.
s 4HEAUDIOSIGNALFROMTHE2-WILLCHANGETHESET
TINGSOFALLTRANSMITTERSWITHINRANGE%XPERIMENT
with this to prevent accidental changes to another
transmitter during a production.
RM Quick Reference
0OWER/N/FF !5$)/&2%1
3ETAUDIOLEVEL !UDPAGEVIA!5$)/
3LEEPOR7AKE 3,%%0UN3,0PAGEVIA!5$)/
,OCKOR5NLOCK ,OCUN,OCPAGEVIA!5$)/
!DJUST2-VOLUME ,OUDPAGEVIA!5$)/
3ET&REQUENCYHEX #(PAGEVIA&2%1
%NABLE-(ZDISPLAY BBLOCKPAGEVIA&2%1
3ETCHANNEL#(-(Z PAGEVIA&2%1
The RM should be held close enough to the microphone to
change the settings on the intended transmitter, and not be
loud enough to affect other transmitters nearby.
Important: The remote control (RC) mode
must be enabled on your SM Series
transmitter for the RM to function with it.
For instructions, refer to page 7 of this
publication.

SMB/EO1 Series
LECTROSONICS, INC.
18
Before going through the following chart, be sure that you have a good battery in the transmitter. It is important that
you follow these steps in the sequence listed.
SYMPTOM POSSIBLE CAUSE
TRANSMITTER PWR LED OFF 1) Battery is inserted backwards or dead.
2) Transmitter not powered up. (See Operating Instructions,
Power UP and Boot Sequence.)
TRANSMITTER PWR LED BLINKS GREEN EVERY FEW SECONDS, TRANSMITTER
DOES NOT RESPOND OTHERWISE 1) Transmitter has been put to sleep by the remote control.
  %ITHERUSETHEREMOTECONTROLTOWAKEITUPAGAINORREMOVE
  ANDREINSERTTHETRANSMITTERSBATTERY
AUDIO LEVEL LEDs NOT LIGHTING 1) Gain control set to minimum.
  "ATTERYISDEADORINSTALLEDBACKWARDS#HECK072,%$
3) Mic capsule is damaged or malfunctioning.
  -ICCABLEDAMAGEDORMISWIRED
RECEIVER RF INDICATOR OFF 1) Transmitter not turned on, or is in Standby Mode.
2) Transmitter battery is dead.
3) Receiver antenna missing or improperly positioned.
4) Transmitter and receiver not on same frequency.
  #HECKSWITCHESDISPLAYONTRANSMITTERANDRECEIVER
5) Transmitter and receiver not on same frequency block.
  /PERATINGRANGEISTOOGREAT
7) Defective transmitter antenna.
NO SOUND (OR LOW SOUND LEVEL), RECEIVER INDICATES PROPER AUDIO MODULATION
1) Receiver output level set too low.
 2ECEIVEROUTPUTDISCONNECTEDORCABLEDEFECTIVEORMISWIRED
3) Sound system or recorder input is turned down.
DISTORTED SOUND 1) Transmitter gain (audio level) is far too high. Check audio level
  ,%$S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.
  5SETHERECEIVERS4ONEFUNCTIONTOCHECKLEVEL
3) Transmitter is not set to same frequency as receiver. Check
that operating frequency on receiver and transmitter match.
 2ECEIVER4RANSMITTER#OMPATIBILITY-ODE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.
 -ICISTOOFARFROMUSERSMOUTH
Troubleshooting

Super-Minature Belt Pack Transmitters
Rio Rancho, NM 19
SYMPTOM POSSIBLE CAUSE
HISS AND NOISE -- AUDIBLE DROPOUTS 1) Transmitter gain (audio level) far too low.
2) Receiver antenna missing or obstructed.
3) Transmitter antenna broken or missing.
 /PERATINGRANGETOOGREAT
 3IGNALINTERFERENCE4URNOFFTRANSMITTER)FRECEIVERSSIGNAL
strength indicator does not drop to nearly zero, this indicates
an interfering signal may be the problem.
Try a different 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
2EMINDERTHATITISNECESSARYTOHOLDDOWNTHE!5$)/OR
  &2%1BUTTONTOMAKEADJUSTMENTSTOTHEAUDIOGAINOR
frequency settings.
“PLL” APPEARS IN DISPLAY 1) Indication that the PLL is not locked. This is a serious condition
that requires factory repair. It may be possible to operate on
another frequency far removed from the one that was selected
when the condition was indicated.
TRANSMITTER WON’T RESPOND TO REMOTE CONTROL
1) If LCD blinks “rc oFF”, transmitter has not been configured
to respond to the remote control. See “Remote Control
  /PERATIONvONPAGEFORINSTRUCTIONSONHOWTOCONlGURE
  )F,#$BLINKShvTRANSMITTERISALREADYSETAS
requested by the remote control.
3) If transmitter does not respond at all, try moving the remote
control closer to the microphone or increasing the remote
  CONTROLSLOUDNESSSETTINGORINCREASINGTHEAUDIOLEVELONTHE
transmitter.
4) Make sure volume of RM and proximity of microphone are
sufficient to engage transmitter.
5) Make sure transmitter is not in Sleep mode.
RM Troubleshooting
FREQUENCY CHANGES, BUT NOT TO DESIRED FREQUENCY
1) RM set on different block than transmitter in question. RM uses
  HEXCODETOSETFREQUENCYSET2-TOPROPERFREQUENCYBLOCK
or use hex code method to change frequency.

SMB/EO1 Series
LECTROSONICS, INC.
20
SMKITTA5 Connector kit for SMV series
  TRANSMITTERSPIN4!&PLUGWITHSLEEVE
SMBCDN Machined, wire belt clip for SMV
transmitters, antenna down
Included Accessories
Place thermal
insulation pad on
back of unit, as
pictured.
SMBCUPSL 3PRINGLOADED
machined aluminum clip
35923 Thermal insulating pad
for SMB
PSM Leather pouch with
integrated belt clip
SMDBCSL 3PRINGLOADED
machined aluminum
clip
35924 Themal insulating pad
for SMDB
Place Thermal
insulation pad on
back of unit, as
pictured.
PSMD Leather pouch with
integrated belt clip
SMDB:
Optional Accessories
SMBCUP Machined, wire belt clip for SMV
transmitters, antenna up
SMDBC -ACHINEDWIREBELTCLIPFOR3-16
and transmitters
SMB: