Samson VLX User manual

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WIRELESS SYSTEM
OWNER ’ S MANUAL
Samson cares about the environment
SAMSON
THE WIRELESS FUTURE"
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Produced by On The Right Wavelength for Samson Technologies Coq>
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Copyright 996, Samson Technologies Corp.
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Printed April, 996
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Wiring Guide nd Ch rt 27
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Samson Technologies Corp.
575 Underhill Blvd.
P.O. Box 903
Syosset, NY 79 -903
Phone: -800-3-SAMSON ( -800-372-6766)
Fax: [phone]
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D: R ck-Mounting
Appendix E: Not All B tteries
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Gloss ry of Terms 34
Specific tions 36
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Frequency Conversion
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Introduction
Introduction
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* VLX TD systems purchased with the VT2G instrument belt-pack
transmitter include a VR22 receiver; all other VLX TD systems include
a VR22X receiver; these two models differ only in that the VR22X
provides a rear-panel balanced XLR output ack.
SPECIAL NOTE: Should your unit ever require servicing a Return
Authorization number (RA) is necessary. Without this number the unit
will not be accepted. Please call Samson at 1-800-372-6766 for a
Return Authorization number prior to shipping your unit. Please retain
the original packing materials and if possible return the unit in its
original carton and packing materials.
In this manual you ’ ll find a more detailed description of the features of
your VLX / VLX TD system as well as a guided tour through all compo 
nents step-by-step instructions for setting up and using your system
information about Samson Noise Suppression trouble-shooting tips a
frequency conversion chart a technical description of True Diversity
rack-mounting instructions a glossary of terms and full specifications.
You ’ ll also find a warranty card enclosed — don ’ t forget to fill it out and
mail it in! This will enable you to receive online technical support and
will allow us to send you updated information about these and other
Samson products in the future.
The VLX and VLX TD VHF Wireless Systems differ in that the VR2
receiver provided in the VLX system utilizes non-diversity technology
incorporating a single antenna for ease of use while the VR22 and
VR22X receivers* provided in the VLX TD system utilize a system called
“ Microprocessor True Diversity ” (patent-pending). In this system a
single chassis (the VR22/22X) houses two antennas (called “ Antenna A ”
and “ Antenna B ” ) and one receiver circuit. A built-in computer chip con 
tinuously scans RF signals from the two antennas and determines which
one has the clearest and strongest reception automatically (and silently)
switching that signal to the receiver. This allows you to maintain the
wireless communication link over a broader range than would be
allowed by a receiver utilizing a single antenna and also reduces inter 
ference and phase cancellation problems. In addition special sample-
and-hold linking circuitry ensures that correct phase correlation is main 
tained at all times with no noise or pops during antenna switching. Both
systems utilize the Samson Noise Suppression system and both provide
excellent performance and the highest quality audio fidelity.
Congratulations on purchasing the Samson VLX / VLX TD VHF Wireless
System! Although this product is designed for easy operation we sug 
gest you first take some time to go through these pages so you can fully
understand how we ’ ve implemented a number of unique features.
Every wireless system consists of at least two components — a transmit 
ter and a receiver both of which must be tuned to the same channel
(that is the same radio frequency) in order to operate correctly.* The
Samson VLX / VLX TD system you have purchased contains either a
VR2 VR22 or VR22X receiver and either a VT2L microphone belt-pack
transmitter (for lavalier microphone and headset applications) a VT2G
guitar belt-pack transmitter (for instrument applications) or a VH2 hand 
held microphone transmitter. Here ’ s an illustration that shows an
overview of our system design:
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* Your receiver and transmitter have been factory preset to utilize the
same channel. A listing of the thirteen available channels and their cor 
responding VHF frequencies can be found on page 26 of this manual.
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System Features
System Features
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* We recommend the use of the Samson RM22 adapter for this
purpose; see page 31 of this manual for rack-mounting instructions.
• The VR22/22X receiver includes a pair of tuned antennas, specially
designed to maximize the effective range of the ireless link..
• The VLX system incorporates non-diversity technology for simple,
reliable operation. The VLX TD system incorporates
Microprocessor True Diversity technology, hich extends the effec
tive range of the system and also reduces potential interference,
noise, pops, and phase cancellation problems.
• The VH2 hand-held microphone transmitter is available in a
selection of popular mic capsules, including:
• The VT2L, VT2G and VH2 transmitters all utilize internal antennas
instead of the bulky external antennas used by many competing
systems. All three transmitters provide extended 18 hour battery life
and po er supplies that aren ’ t fussy, accepting standard 9-volt
alkaline batteries.
• Built-in Samson Noise Suppression circuitry in both the transmitter
and receiver. This ensures clear, transparent sound ith an
absolute minimum of background noise and hiss.
• Thirteen different available channels, designed for simultaneous
use. This means that you can use multiple VLX / VLX TD systems
(each tuned to a different channel) in the same location ithout
interference.
• The VT2L and VT2G belt-pack transmitter is extremely light eight
(less than 4 ounces ith a 9-volt battery installed). The VT2G
comes pre ired ith permanent connection to a standard 1/4" jack
(for use ith instruments such as electric guitar or bass), hile the
VT2L provides a S itchcraft P3 mini-XLR jack for connection to a
variety of popular headsets and lavalier microphones, including:
Electro Voice ND 757A N/DYM Dynamic
Electro Voice ND 857 N/DYM Dynamic
Samson S11 Dynamic
Shure SM58 Dynamic
Shure SM85 Condenser
Shure SM87 Condenser
• The VR22/22X is a half-rack unit that can be used freestanding or
can be mounted in any standard 19" rack,* making it easy to
integrate into any traveling or fixed installation audio system.
• All components have rugged construction that ensures reliable
operation in even the most demanding performance environments.
• The VT2L, VT2G and VH2 transmitters all provide “ popless ”
muting — their mute function turns off the audio signal hile leaving
the carrier signal on.
The Samson VLX / VLX TD VHF Wireless System utilizes the latest
advancements in ireless communications. Here are some of its main
features:
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* Optimized for aerobics orkouts, this headset is recommended for
usage in high-humidity environments such as physical fitness centers.
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AKG C-410 headset
AKG C-409 horn microphone
Audio-Technica ATM-75 headset
Audio-Technica MT-350 lavalier
Audio-Technica Pro-8HE headset*
Audio-Technica 831 H-7 lavalier
Countryman IsoMax headset
Cro n CM-311 / CM-312 headset
Samson ECM-40 lavalier
Sennheiser MKE-2 lavalier
Sony ECM-44 lavalier
Sony ECM-55 lavalier
Sony ECM-77 lavalier
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Guided Tour - VR2 Front Panel
Guided Tour - VR2 Front Panel
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OUTPUT
POWER TXON
VOLUME
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2: Power LED - This is lit whe ever the VR2 is powered o .
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5: Volume control - This k ob determi es the level of the audio sig al
se t from the VR2 output jack (see #6 below).
3: TX On LED - Whe carrier sig al of sufficie t stre gth is bei g
received by the VR2, this LED is lit.
4: Peak LED - This LED lights whe output sig al from the VR2 is at
the o set of clippi g (that is, whe it is o the verge of bei g distorted).
If you see this light duri g operatio , move the micropho e further away
or lower the output level of your i strume t or tra smitter. For more
i formatio , see the sectio i this ma ual e titled “ Setti g Up a d
Usi g the VLX / VLX TD System ” o page 16.
1 : Antenna - Duri g ormal operatio , this should be fully exte ded a d
i a vertical positio . Do not substitute a third-party receiver a te a.
See the sectio i this ma ual e titled “ Setti g Up a d Usi g the VLX /
VLX TD System ” o page 16 for i formatio about a te a positio i g.
: Output jack - Use this u bala ced (-10 dB) high impeda ce (5K
Ohm) 1/4" jack to co ect the VR2 to your audio equipme t. Wiri g is
as follows:
+ SIGNAL
GROUND
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Channel 13

Guided Tour - VR2 Rear Panel
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2: Power LED - This is lit whenever the VR22/22X is powered on.
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2: DC input - Connect the supplied Sa son AC300R adapter here.
WARNING: Do not substitute any other kind of power adapter; doing so
can cause severe da age to the unit and will void your warranty.
1: Antennas A and - During nor al operation, these should be fully
extended and in a vertical position. Do not substitute third-party receiv
er antennas. See the section in this anual entitled “ Setting Up and
Using the VLX / VLX TD Syste ” on page 16 for infor ation about
antenna positioning.
1 : Mute control - This control deter ines the axi u range of the
VR2 before audio signal dropout. It should nor ally be left at its factory
setting. For ore infor ation, see the “ Setting Up and Using the VLX /
VLX TD Syste ” section on page 16.
VDCTO
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Guided Tour - VR22/22X
Front Panel
3: Peak LED - This LED lights when output signal fro the VR22X is
clipping (distorted). If you see this light during operation, ove the
icrophone further away or lower the output level of your instru ent or
trans itter. For ore infor ation, see the section in this anual
entitled “ Setting Up and Using the VLX I VLX TD Syste ” on page 16.
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MICROPROCESSOR TRUE DIVERSITY
(Channel 13)
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1 : DC input - Connect the s pplied Samson AC300R adapter here.
WARNING: Do not s bstit te any other kind of power adapter; doing so
can ca se severe damage to the nit and will void yo r warranty.
* If your VLX TD system has a VR22X receiver, both the front panel
1/4" unbalance an rear panel XLR balance outputs can be use
simultaneously if necessary.
6: Output jack* - Use this nbalanced (-10 dB) high impedance
(5K Ohm) 1/4" jack to connect the VR22/22X to yo r a dio eq ipment.
Wiring is as follows:
3: XLR Output jack (VR22X only) - Use this electronically balanced low
impedance (600 Ohm) XLR jack to connect the VR22X to professional
(+4 dBv or -30 dBm) a dio eq ipment.* Pin wiring is as follows:
2: M te control - This control determines the maxim m range of the
VR22X before a dio signal dropo t. It sho ld normally be left at its
factory setting. For more information, see the “ Setting Up and Using the
VLX / VLX TD System ” section on page 16.
* If your VLX TD system has a VR22X receiver, both the rear panel XLR
balance an front panel 1/4" unbalance outputs can be use simulta 
neously if necessary.
: LEDs - When signal is being received, one of these LEDs
will be lit, showing yo whether signal from either the “ A ” or “ B ” antenna
is c rrently being sed. A comp ter chip inside the VR22/22X constantly
scans the two and a tomatically selects whichever is receiving the
strongest, clearest signal. This “ Microprocessor Tr e Diversity ”
switching is completely ina dible, and it effectively increases overall
range while red cing potential interference and phase cancellation
problems. For more information, see Appendix C ( “ Abo t Tr e
Diversity ” ) on page 28 in this man al.
Guided Tour - VR22/22X
Rear Panel
5: Volume control - This knob determines the level of the a dio signal
sent from the VR22/22X o tp t jack(s) (see #6 below and #3 on the next
page).
+ SIGNAL ~cn^~ J] □ an}
GROUND
Guided Tour - VR22/22X
Front Panel
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Guided Tour - VT2L / VT2G
Guided Tour - VT2L / VT2G
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(Channel 13)
(Channel 13)
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2: Battery LED - This LED is an indicator of batter strength. When
the VT2L I VT2G is first powered on, this LED will light for about two-
tenths of a second (if the batter is sufficientl strong), and will then go
off. When batter voltage is low, this LED lights steadil , indicating that
the batter needs to be replaced.
3: ower on-off switch - Use this to turn the VT2L I VT2G on or off
(to conserve batter power, be sure to leave it off when not in use).
WARNING: Be sure to mute the audio signal at our external mixer or
amplifier before turning the VT2L / VT2G power on or off, or an audible
pop ma result.
4: Input connector - The input device is connected here. The VT2L is
supplied with either a lavalier or headset microphone (connected via a
Switchcraft mini-XLR jack, as shown in the illustration above), while the
VT2G is supplied with a permanentl connected 1/4" jack cable.
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7: lastic screwdriver - Speciall designed for use in adjusting the
VT2L / VT2G Level control (see #8 on the next page) and/or VR2 or
VR22/22X receiver Mute control (see the “ Guided Tour: VR2 [or
VR22/22X] Rear Panel ” and “ Setting Up and Using the VLX / VLX TD
S stem ” sections on pages 7, 10 and 16 for more information).
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1: Mute on-off switch - When set to the “ Off ” position, audio signal is
transmitted. When set to the “ On ” position, the audio signal is muted.
The advanced circuitr in the VLX / VLX TD s stem ensures that no
“ pop ” or “ thud ” will be heard during muting. Note that turning this on
does not turn off the VT2L / VT2G power — it is simpl a wa to tem 
poraril mute the transmission of audio signal. If ou don ’ t plan on
using the VT2L I VT2G for extended periods, turn off its power b using
the power on-off switch (see #3 below).
5: Battery door - Opening the VT2L / VT2G batter door must be done
with care. See the “ Setting Up and Using the VLX / VLX TD S stem ”
section on page 16 for more information.
6: Battery holder - Insert a standard 9-volt alkaline batter here, being
sure to observe the plus and minus polarit markings shown. We
recommend the Duracell MN 1604 t pe batter . Although rechargeable
Ni-Cad batteries can be used, the do not suppl adequate current for
more than four hours. WARNING: Do not insert the batter backwards;
doing so can cause severe damage to the VT2L / VT2G and will void
our warrant .
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Guided Tour - VH2
Guided Tour - VT2L / VT2G
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8: Audio Input Level control (trimpot) - This input sensitivity control
has been factory preset to provide optimum level for the particular
lavalier or headset model being used in the case of the VT2G, it is
preset for optimum instrument level) and so we recommend that this not
be adjusted manually. If necessary, however, you can use the supplied
plastic screwdriver to raise or lower the VT2L / VT2G input level. See
the “ Setting Up and Using the VLX I VLX TD System ” section on page
16 for more information.
1 : Audio on-off s itch - When set to the “ On ” position, audio signal is
transmitted. When set to the “ Off ” position, the audio signal is muted.
The advanced circuitry in the VLX / VLX TD system ensures that no
“ pop ” or “ thud ” will be heard during muting. Note that turning this off
does not turn off the VH2 power — it is simply a way to temporarily mute
the transmission of audio signal. If you don ’ t plan on using the VH2 for
extended periods, turn off its power by using the power on-off switch
see #3 on the next page).
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Guided Tour - VH2
CHANNEL NUMBER
I TRUE DIVERSITY
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16
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VHF FM RE CEIVER
The basic procedure for setti g up a d usi g your VLX / VLX TD VHF
Wireless System takes o ly a few mi utes:
2: Battery LED - This LED is a i dicator of battery stre gth. Whe the
VH2 is first powered o , this LED will light for about two-te ths of a
seco d (if the battery is sufficie tly stro g), a d will the go off. Whe
battery voltage is low, this LED lights steadily, i dicati g that the battery
eeds to be replaced.
3. Make sure the Power o -off switch i your VT2L / VT2G beltpack or
VH2 ha dheld tra smitter is set to “ Off. ”
5: Battery holder - I sert a sta dard 9-volt alkali e battery here, bei g
sure to observe the plus a d mi us polarity marki gs show . We
recomme d the Duracell MN 1604 type battery. Although rechargeable
Ni-Cad batteries ca be used, they do ot supply adequate curre t for
more tha four hours.
ARNING: Do ot i sert the battery backwards; doi g so ca cause
severe damage to the VH2 a d will void your warra ty.
4: Microphone Input Level control (trimpot) - This i put se sitivity
co trol has bee factory preset to provide optimum level for the
particular micropho e capsule provided with your VLX / VLX TD system
a d so we recomme d that this ot be adjusted ma ually. If ecessary,
however, you ca use the supplied plastic screwdriver to raise or lower
the i put level. See the “ Setti g Up a d Usi g the VLX / VLX TD
System ” sectio o page 16 for more i formatio .
3: Power on-off switch - Use this to tur the VH2 o or off (to
co serve battery power, be sure to leave it off whe ot i use).
ARNING: Be sure to mute the audio sig al at your exter al mixer or
amplifier before tur i g the VH2 power o or off, or a audible pop may
result.
1. For the VLX I VLX TD system to work correctly, both the receiver a d
tra smitter must be set to the same cha el. Remove all packi g
materials (save them i case of eed for future service) a d check to
make sure that the supplied VR2, VR22 or VR22X receiver a d VT2L,
VT2G or VH2 tra smitter are set to the same cha el (this is listed o
the top of the VR2 or VR22/22X, o the belt clip of the VT2L / VT2G, a d
o the bottom of the VH2, as show i the illustratio below).
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2. O the VR2, exte d the a te a a d place it i a vertical positio .
O the VR22/22X, fully exte d both “ A ” a d “ B ” a te as a d place both
i a vertical positio .
If these cha els do ot match, co tact Samso Tech ical Support at
1-800-372-6766.
Setting Up and Using the
VLX / VLX TD System
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4a. If your system contains a VT2L or VT2G transmitter, locate the
Open arrow on the rear of its battery door and press down and forward
(away from the belt clip), then lift up. s shown in the illustration below ;
the battery door is hinged and not intended to be removed from the
transmitter case. Please use care when opening this door as undue
force will destroy the hinge.
9. Now it ’ s time to set the audio levels. Turn on your connected
amplifier and/or mixer but keep its volume all the way down. Next,
make sure that your transmitter is unmuted, as follows:
7. Turn the Volume knob on the receiver completely counterclockwise.
Connect the supplied C300R adapter to the DC Input on the rear panel
of the receiver, then plug the C300R adapter into any standard C
outlet. The “ Power ” LED will light up, but all other LEDs will remain unlit.
5. Place a fresh 9-volt alkaline battery in the transmitter battery holder,
taking care to observe the polarity markings. If you are using a VT2L or
VT2G transmitter, replace the battery door by swinging it down so that it
is parallel with the rear panel and then gently pushing upward towards
the belt clip. If you are using a VH2 transmitter, replace the bottom
section of the microphone by sliding it on and then screwing it back on.
Whichever transmitter you are using, leave it off for the moment.
8. Turn on the power to the VT2L, VT2G or VH2 transmitter (using its
Power on-off switch); its “ Battery ” LED should briefly light if the battery is
good. If your system contains a VR2 receiver, the “ TXON ” LED on its
front panel will light. If your system contains a VR22 or VR22X receiver,
either the “ ” or “ B ” LED on the front panel will light (depending upon
which antenna is receiving the stronger signal).
Then set the Volume knob on the receiver to the 3 o'clock position (this
is unity gain). If you are using the VH2 transmitter or if you are using the
VT2L transmitter with a connected lavalier microphone or headset,
speak or sing into the mic at a normal performance level while slowly
raising the volume of your amplifier/mixer until the desired level is
reached. If you are using the VT2G transmitter with a connected instru 
ment, play the instrument at normal performance level while slowly rais 
ing the volume of your amplifier/mixer until the desired level is reached.
If you are using a VT2L beltpack transmitter equipped with a lavalier
6. Make the physical cable connection between the receiver output jack
and the audio input of your amplifier or mixer. If your system contains a
VR22X receiver (provided in VLX TD systems equipped with handheld,
lavalier or headset microphones), you can use the unbalanced 1/4 ” out 
put jack on the front panel and/or the balanced XLR output jack on the
rear panel. If you are using professional (+4) equipment, the balanced
XLR jack is preferable since it will deliver an electromagnetically cleaner
signal. Leave your amplifier (and/or mixer) off at this time.
Setting Up and Using the
VLX / VLX TD System
Setting Up and Using the
VLX / VLX TD System
n~1 r —
4b. If your system contains a VH2 transmitter, unscrew the bottom
section of the microphone by turning it counterclockwise and then slide
it off.
• If your system contains a VT2L or VT2G transmitter, set its Mute
switch to “ Off ”
• If your system contains a VH2 transmitter, set its udio switch to
“ On ”

1
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19
Note that, following this setup procedure, you can always lower the
Volume knob of the VR2 or VR22/22X below the 3 o'clock position in
order to attenuate the output signal if necessary.
away. f this does not solve the problem, use the supplied plastic
screwdriver to turn the Level control (trimpot) on the VT2L slowly
counterclockwise until the distortion disappears.
11. Conversely, if you hear a weak, noisy signal at the desired volume
level, again make sure that the gain structure of your audio system is
correctly set (consult the owners manual of your mixer and/or amplifier
for details). f it is and the signal coming from the receiver is still weak
and/or noisy, do the following:
10. f you hear distortion at the desired volume level, first check to see
whether the “ Peak ” LED on the receiver is lit. f it is not, make sure that
the gain structure of your audio system is correctly set (consult the own 
ers manual of your mixer and/or amplifier for details). f the “ Peak ” LED
is lit, do the following:
microphone, note that correct lavalier placement is critical to sound
quality. We recommend that you place it as shown in the illustration
below — as close to your mouth as possible but off to one side (to
minimize nasality) and unobstructed by clothing. Bear in mind also that
omni microphones (mics which pick up signal from all directions) are
more prone to feedback problems than unidirectional (cardioid or
supercardioid) ones; in general, you can avoid feedback by taking care
not to use any microphone directly in front of a PA speaker (if this is
unavoidable, try using an equalizer to attenuate those high- or mid 
range frequencies which are causing the feedback “ squealing ” ).
• f you are using a VT2L transmitter with connected lavalier
microphone or headset, its Level control has been factory preset to
provide optimum level for the particular lavalier or headset model
being used and so no adjustment should be necessary.
Any distortion present should therefore simply be a matter of the
microphone being too close to the mouth; try moving it further
• f you are using a VH2 transmitter, use the supplied plastic
screwdriver to turn its Level control (trimpot) slowly counterclock
wise (towards the “ Min ” position) until the distortion disappears.
• f you are using a VT2L transmitter with connected lavalier micro 
phone or headset, its Level control has been factory preset to
provide optimum level for the particular lavalier or headset model
being used and so no adjustment should be necessary. Any
weakness of signal should therefore simply be a matter of the
microphone being too far from the mouth; try moving it closer. f
this does not solve the problem, use the supplied plastic screwdriv 
er to turn the Level control (trimpot) on the VT2L slowly clockwise
until the signal reaches an acceptable level.
• f you are using a VH2 transmitter, use the supplied plastic screw
driver to turn the Level control (trimpot) on the transmitter slowly
clockwise (towards the “ Max ” position) until the signal reaches an
acceptable level.
• f you are using a VT2G transmitter with an instrument such as
electric guitar or bass, lower the output level of the instrument until
the distortion disappears. Alternatively, you can use the supplied
plastic screwdriver to turn the Level control (trimpot) on the VT2G
slowly counterclockwise until the distortion disappears.
• f you are using a VT2G transmitter with an instrument such as
electric guitar or bass, raise the output level of the instrument until
a good signal is achieved. Alternatively, you can use the supplied
plastic screwdriver to turn the Level control (trimpot) on the VT2G
slowly clockwise until the signal reaches an acceptable level.
20
*
I
Setting Up and Using the
VLX / VLX TD System
Setting Up and Using the
VLX / VLX TD System

TIP (+ SIGNAL)
I
® o
(U
1
22
21
Also, do not connect the output of the VR2 or VR22/22 directly to
the line-level input of signal processors; to apply effects to the VR2 or
VR22/22 output signal, connect signal processors to mixer insert
points or use them in an “ effects loop ” (send/return) configuration.
Note that, following this setup procedure, you can always raise the
Volume knob of the VR2 or VR22/22 above the 3 o'clock position in
order to boost the output signal if necessary.
NOTE: The VL I VL TD system is designed to replace the wire that is
used in wired microphone systems, providing a gain ratio of 1 : 1.5.
Therefore, when using a mixer that provides low impedance mic inputs,
always connect the VR2 or VR22/22 to those mic inputs, as opposed
to line-level (high impedance) inputs. Because mic inputs normally
utilize LR-type connectors (as opposed to the 1/4" phone connector
provided by the VR2 or VR22), you will have to use a cable that has a
male LR plug at one end and a 1/4" phone plug at the other end, wired
as shown below:
2 + SIGNAL
1 GROUND
3 -SIGNAL
13. When first setting up the VL I VL TD System in a new environ 
ment, it ’ s always a good idea to do a walkaround in order to make sure
that coverage is provided for your entire performance area. Accordingly,
turn down the level of your audio system and turn on both the transmit 
ter and receiver. Then, with the transmitter unmuted, restore the level of
your audio system and while speaking, singing, or playing your instru 
ment, walk through the entire area that will need to be covered. If you
have a VL system, as you do so, you may find that the “ T ON ” LED on
the VR2 receiver occasionally goes off, indicating that the carrier signal
being received from the transmitter is too weak to provide audio output.
If you have a VL TD system, you may find that the “ A ” and “ B ” LEDs on
the VR22/22 receiver occasionally switch on or off, always showing
you which antenna is receiving the stronger signal. The basic rule of
thumb for all wireless audio systems is to always try to minimize the dis 
tance between transmitter and receiver as much as possible and also to
try to maintain “ line of sight ” between the two (that is, the person using
the transmitter should be able to see the receiver antennas). The idea
is to ensure that the strongest possible signal is received from all
planned transmission points. In fixed installations such as A/V or
corporate conference rooms or for extended range applications (where
the transmitter and receiver are more than 150 feet apart), it may be
desirable to angle the antennas differently from their vertical position or
to install the receiver in the same room as the transmitters (and, if
necessary, to extend the wiring to remote audio equipment). For more
information, see the “ Trouble-shooting ” section on pages 24 - 25 in this
manual.
12. Temporarily turn down the level of your mixer/amplifier system and
turn off the power to your transmitter, leaving the receiver on. Then
restore the previously set level of your mixer/amplifier. With the trans 
mitter off, the receiver output should be totally silent — if it is, skip ahead
to the next step. If it isn ’ t (that is, if you hear some noise), you may
need to adjust the VR2 or VR22/22 rear panel Mute control. When the
Mute control is at its minimum setting, the VL / VL TD system always
provides maximum range without dropout; however, depending upon the
particular environment your system is used in, you may need to reduce
that range somewhat in order to eliminate band noise when the transmit 
ter is turned off. To do so, use the provided screwdriver to rotate the
Mute control completely counterclockwise (to the “ Min ” position), then
slowly turn it clockwise until the noise disappears. If no noise is present
at any position, leave it at its fully counterclockwise “ Min ” position (so as
to have the greatest overall range available).
If you have followed all the steps above and are experiencing
difficulties, call Samson Technical Support (1-800-372-6766) between
9 AM and 5 PM EST.
Setting Up and Using the
VLX / VLX TD System
Setting Up and Using the
VLX / VLX TD System
Connect
2| these
together
SLEEVE (GROUND and - SIGNAL)

Trouble-shooting
Problem: No sound
3. Is the battery in your transmitter fresh?
8. If you ’ re using a mixer, are all channels out of solo mode?
23
24
7. Is your mixer/amplifier system po ered on and is its level control or
fader up and unmuted?
2. Are your transmitter and receiver both po ered on? (The Po er LED
on the front panel of the receiver ill light hen it is po ered on.)
1. Are your transmitter and receiver both set to the same channel
number?
6. Is the cable connection bet een the receiver audio output and your
mixer/amplifier input secure?
9. If you ’ re using a VT2G transmitter ith a 1/4" instrument jack
connection, is the connection to the instrument secure? Is the
instrument ’ s master volume up?
4. If you are using a VT2L or VT2G transmitter, is its Mute s itch set to
“ Off ” ? If you are using a VH2 transmitter, is its Audio s itch set to “ On ” ?
All the components in the VLX / VLX TD VHF Wireless System utilize
special Samson Noise Suppression circuitry so as to ensure the highest
fidelity sound ith an absolute minimum of background noise and hiss.
This is a companding system; that is, the signal being transmitted has its
dynamic range compressed and its high frequencies boosted (this
process is kno n as pre-emphasis encoding), and the signal being
received has its dynamic range expanded and high frequencies
attenuated in an exactly opposite ay (this process is kno n as
de-emphasis decoding). The pre-emphasis encoding process is
automatically carried out by the VT2L, VT2G and VH2 transmitters and
the de-emphasis decoding process is automatically carried out by the
VR2, VR22 and VR22X receivers.
5. Is the Volume knob on the receiver set to a value greater than
minimum?
Solution: Follo these step-by-step trouble-shooting suggestions
to identify the problem. If the ans er to any of these questions is “ no, ”
you ’ ve probably located the difficulty. When orking correctly, the
“ TXON ” LED on the VR2 front panel or either the “ A ” or “ B ” LED on the
VR22/22X front panel ill be lit henever both the receiver and transmit 
ter are on. If both units are on and neither of these LEDs is lit, start ith
question 1 and ork your ay through this list in order. If the VR2
“ TXON ” or either the VR22/22X “ A ” or “ B ” LED is lit, you can skip ahead
to question 4 and then ork your ay through this list in order.
About the Samson Noise
Suppression Circuitry

Trouble-shooting
25 26
Also, if the VR22/22X receiver is mounted in a rack near equipment such
as computers, hard drives, or electronic keyboards or tone generators,
intermodulation noise can occur Try moving the receiver 5 or 6 feet
away from such equipment — if the noise disappears, you ’ ve located
(and solved) the problem
Solution! Try changing the position of the receiver antenna(s) or
try relocating the transmitter and/or receiver In general, it ’ s best to
minimize the distance between the two and also to try to keep a clear
line of sight, so that the person wearing or using the transmitter can
always see the receiver
If the answer to all these questions is “ yes ” and you still hear no sound,
call Samson Technical Support at 1-800-372-6766 between 9 AM and
5 PM EST Bear in mind also that both the receiver and transmitter in
the VLX / VLX TD System contain delicate components called crystals.
As their name implies, these are subject to damage when the unit is
subjected to extreme stress (such as being dropped from a significant
height), so treat your receiver and transmitter with the kind of TLC you
normally reserve for loved ones!
Solution: This will occur if two or more users are using VLX / VLX
TD (or other wireless) systems at the same location and more than one
system is set to the same channel Each VLX / VLX TD user at a given
location must be using a discrete transmitter and receiver set to a
different channel.
Problem: Sound fades as performer moves
around (sound dropout)
Channel
0
1
2
3 _
5
6
7
8
9
10
11
12
13
Problem: Distorted sound
(Cross-modulation interference)
Frequency
174 6 MHz
177 6 MHz
181 6 MHz
183 6 MHz
190 6 MHz
192 6 MHz
195 6 MHz
196 6 MHz
199 6 MHz
202 2 MHz
208 2 MHz
211 2 MHz
213 2 MHz
Appendix A:
requency Conversion Chart

Appendix B: VT2L Multipin
Appendix C: About True Diversity
Wiring Guide and Chart
1
2
3 4
SW TCHCRAFT TA3F
Space Diversity
MANUFACTURER MODEL PIN 2 PIN 3
AKG
C409
WHITE JUMP TO PIN 2
AKG C410
WHITE JUMP TO PIN 2
AUDIO TECHNICA
AT831
JUMP TO PIN 2 RED X 2
AUDIO TECHNICA
ATM71
JUMP TO PIN 2 RED X 2
AUDIO TECHNICA
ATM75
RED x 2
JUMP TO PIN 2
AUDIO TECHNICA
ATPRO8HE
N/C RED X 2
AUDIO TECHNICA
HIELD
WHITE
JUMP TO PIN 2
CROWN
RED JUMP TO PIN 2
ONY
ECM44
JUMP TO PIN 2
RED
ONY
ECM55
JUMP TO PIN 2 RED
Antenna A
ONY ECM77
JUMP TO PIN 2
RED
ONY ECM 144
AF OUTPUT
WHITE JUMP TO PIN 2
P
ENNHEI ER
MKE2
JUMP TO PIN 2
RED
NOI E REDUCTION
V
ENNHEI ER
MKE40
JUMP TO PIN 2
RED
Adlonna B
ENNHEI ER
MKE48
JUMP TO PIN 2
RED
FO TER
ECM40
HIELD JUMP TO PIN 2 WHITE
COUNTRYMAN I OMAX
HIELD
WHITE
JUMP TO PIN 2
GUITAR
HIELD N/C AUDIO
PIN INFORMATION
GROUND
+Vdc AUDIO
28
27
WITCHCRAFT
TA3F
YELLOW x 2
HIELD
YELLOW x 2
HIELD
YELLOW x 2
HIELD
HIELD
BLUE
HIELD
WHITE
HIELD
WHITE
HIELD
WHITE
HIELD
HIELD
BLUE
>
►
Procedure for wiring VT2L connector: Unscrew rubber boot 1 and pass
wire through 1 and 2. older wire to 3 after removing from 4 (use chart
above). Reinsert 3 to 4 with attached wire (3 is keyed to fit 4). Plug 2 into
3 again (2 is keyed to 3) and crimp wire. Rescrew rubber boot 1 to 4.
YELLOW X 2
HIELD
HIELD
BLUE
HIELD
WHITE
RECEIVER
CIRCUIT
RECEIVER
CIRCUIT
WITCHING
CIRCUIT
The advantage to this kind of system is that the effective range is greatly
expanded and many potential interference problems are eliminated,
since, when one antenna is partially obstructed or is receiving interfer 
ence, the other may not be. The disadvantage is that using two separate
receivers can cause phase differential problems and such systems tend
to be more cumbersome and expensive.
* The VT2L, VT2G and VH2 transmitters utilized by the VLX TD system
all have internal antennas.
The two basic components in any wireless system are a transmitter and
receiver, each with its own antenna(s).* The effective range of the
system is largely determined by how much area between the transmitter
antenna and receiver antenna is physically unobstructed. Because most
environments contain numerous obstructions (thus limiting the effective
range), manufacturers of wireless systems have in recent years evolved a
technology called “ pace Diversity, ” as shown in the illustration below.
In these systems, a single chassis houses two receivers, both tuned to
the same channel (that is, radio frequency) as the transmitter, but with
each receiver having its own antenna (usually called “ Antenna A ” and
“ Antenna B ” ). A switching circuit then continuously scans the two
receiver signals, automatically routing the stronger of the two to the noise
reduction decoder (if one is used) and final audio output:
As described in the Introduction to this manual, the VLX TD VHF Wireless
ystem utilizes a technological breakthrough called “ Microprocessor True
Diversity ” (the VLX ystem uses Non-Diversity technology). In this
section, we ’ ll take a closer look at how Diversity systems work.
MT350
CM311E
CM312E
HIELD
RED
PIN 1
HIELD
RED
9 sw

Appendix C: About True Diversity
Appendix C: About True Diversity
Antenna True Diversity
Microprocessor True Diversity
Y
Antenna A
-►I NOISE REDUCTION [■
Q) AF OUTPUT
Antenna A
ISOLATION AMP
Antenna B
SW
Co;
? a
I
-{
Antenna B
ISOLATION AMP
29
30
-►] s / h [-►[
T e end result is extended range, crystal-clear sound, and t e virtual
elimination of p ase correlation and spurious noise problems.
RECEIVER
CIRCUIT
An alternative design is called “ Antenna True Diversity, ” as s own in t e
illustration below. Here, instead of aving two receivers, a single
c assis ouses two antennas and a single receiver circuit. A circuit
t en continuously scans t e signal coming from Antenna A. W en t is
signal drops below a predetermined t res old level, signal from
Antenna B is added to t e mix (after first being p ase s ifted by 180° in
order to avoid p ase cancellation problems). From t ere, t e signal
from eit er Antenna A alone (if it is strong enoug ) or Antenna A plus
Antenna B (if t e Antenna A signal is too weak) is routed to t e noise
reduction decoder (if one is used) and final audio output.
Your VLX TD system utilizes a completely new kind of tec nology called
“ Microprocessor True Diversity, ” w ic yields significantly improved per 
formance over ot er True Diversity systems. T e illustration below
s ows ow it works. Here, a ig -speed computer c ip (a microproces 
sor) continuously scans t e RF signals coming from two discrete anten
nas, automatically (and silently) routing t e stronger and clearer signal to
t e receiver circuit (t ese reroutings can occur as frequently as 200,000
times a second!). Isolation amplifiers ensure t at t ere is no close-field
interference between t e two antennas and a sample-and- old linking
circuit automatically eliminates audio spikes or pops caused by p ase
differential during antenna switc ing, providing a smoot , glitc -free tran 
sition between signals. From t e sample-and- old circuit, t e signal is
routed to a Samson Noise Suppression decoder (so as to minimize any
background noise and iss) and on to t e final audio output jack.
MIXING SW '
Q
T e problem wit t is kind of system is t at, since t e two antennas are
in p ysically different areas (even t oug just a few inc es apart), t ere
is a certain delay time between t e two, w ic can cause a p ase
difference between t e two signals. T is can result in a receiving
condition w ic is actually worse t an if only a single antenna were
being used. Moreover, a spike noise can appear in t e output signal
w enever t e system switc es to add in signal from Antenna B —
particularly w en t e transmitter is at a long distance from t e receiver.
Eliminating t ese glitc es in t e sound usually involves a temporary
muting or gating of t e audio signal.
180°
PHASE SHIFT
RECEIVER
CIRCUIT
▼
SWITCHING
CIRCUIT
AF OUTPUT
NOISE SUPPRESSION
SWITCHING
CIRCUIT
CPU

A
f|f|
I 1
V V
Battery #1 Battery #2 Battery #3
32
31
SAMSON
\n->c m
i
* When using rechargeable batteries, we recommend VARTA batteries
as they will charge to the proper amperage.
Putting matchbooks or paper in the battery compartment as a spacer
can also cause long term battery terminal damage. Most problems with
a wireless unit cutting out ” are caused by these factors and can usually
be remedied with a tweezer or a small screwdriver. If you use a larger
battery, we recommend that you continue using that brand in order to
maintain a positive fit.
I
Larger batteries (Battery #2 and #3 in the illustration below) can actually
cause long term damage to your battery terminal fit, break battery
doors, and push in the battery terminals past the point of spring-back.
A C
.......... “ E
2"
1.75"
1.5"
1.25"
1"
.75"
.5"
.25"
I
1,75'
1.5'
1,2b'
1'
,7b'
.5'
,2b'
I
T
i
Appendix E: Not All Batteries
Are Created Equal
The transmitter provided with your Samson VLX I VLX TD VHF Wireless
System requires a 9-volt battery for power, but there can be substantial
differences between different brands of batteries. In fact, out of all the
major brand batteries currently on the market, only the DURACELL
MODEL MN 1604 (as indicated by Battery #1 in the illustration below)
will fit correctly, since the VT2L/VT2G/VH2 battery compartment is
designed to accommodate its precise dimensions.*
Appendix D:
Rack-Mounting t e VR22/22X
The VR22/22X receiver can be used either freestanding or mounted in a
standard 19" rack. If rackmounted, it is designed to fit into the Samson
RM22 rack adapter, which takes a single rack space. The illustration
below shows how the VR22/22X is to be mounted into the RM22:

Glossary of Terms
© ©
y
Fig. A
Fig. B
Fig. C
Fig. D
33
To prevent the pushing in of battery terminals caused by the use of
improperly sized batteries, Samson can provide you free of charge
with square rubber pads that can be installed on the battery terminals
of your VT2L/VT2G/VH2 transmitter. To request a set, just call us at
1-800-3-SAMSON.
NOTE: Battery terminals should be cleaned periodically to insure good
contact. Use a pencil eraser or some other soft abrasive material, as
shown in Figure D.
To install these rubber pads:
1. Pull up the battery terminals to approximately 90° (Figure A).
2. Peel the backing off the rubber pad in order to expose the adhesive
(Figure B).
3. Press the rubber pad in place under the lip of the outstretched
battery terminal (Figure C).
4. Carefully push the terminals back into place.
Appendix E: Not All Batteries
Are Created Equal
AF - Short for “ Audio Frequency. ”
Audible - A sound that we can hear, generally in the 20 Hz - 20 kHz
frequency range.
Carrier - An inaudible high-frequency radio signal that is continuously
modulated by an audible signal (it therefore is said to “ carry ” the audible
signal).
Channel - In wireless transmission, refers to a particular radio
frequency.
Demodulation - The process of removing the carrier signal and thereby
restoring the original audible signal.
Frequency - Refers to the number of wavecycles occurring per second.
Audible frequencies are in the range 20 Hz - 20 kHz; radio frequencies
are considerably higher.
eadset - A “ hands-off ” microphone worn with a headband.
ertz ( z) - A unit of frequency measurement denoting one wavecycle
per second.
Inaudible - A sound that we cannot hear. Radio waves (which have
frequencies ranging from the tens of thousands to millions of waves per
second) are all inaudible.
Kilo ertz (k z) - A unit of frequency measurement denoting one
thousand wavecycles per second.
Lavalier - A “ hands-off ” clip-on mini-microphone.
Mega ertz (M z) - A unit of frequency measurement denoting one
million wavecycles per second.
Microprocessor True Diversity - An advanced wireless reception
technology (utilized by the VLX TD System) by which a single chassis
houses two discrete antennas (with both tuned to the same frequency)
and a receiver circuit. A built-in computer chip then continuously scans
the two antennas and determines which one has the clearest and
strongest reception, automatically (and silently) switching that signal to
the receiver circuitry. The result is that the wireless communication link
can be maintained over a broader area range than would be allowed by
a receiver utilizing a single antenna. In addition, the provision of
Isolation amplifiers and a sample-and-hold linking circuit results in the
reduction of interference and audible pops and clicks.
Modulation - The process by which one signal is continuously affected
by another.
Noise Suppression - A process by which the level of extraneous noise
or hiss in a signal is reduced considerably. The VLX / VLX TD System
utilizes the Samson Noise Suppression system.
34
Channel 2 )
■ <> „
I MH|

Glossary of Terms Specifications
VH2
36
35
Number of Channels
Type of Reception
Signal Sensitivity
25 Milliamps Ma .
27 Milliamps Ma .
Receiver (VR2, VR22, VR22X):
Receive Frequency Range
Internal Oscillators
Stability
Transmitter (VT2L, VT2G and VH2):
OSC System
RF Power
Antenna Type
Transmit Frequency Range
Power On/Off, Mute On/Off,
Level Control (Trimpot)
Power On/Off, Audio On/Off,
Level Control (Trimpot)
Battery low
Non- iversity - A wireless reception technology (utilized by the VLX
System) whereby a receiver uses a single antenna.
Receiver - A component that receives a modulated radio signal and
reconstructs the original audible signal by utilizing demodulation.
RF - Short for “ Radio Frequency. ”
Transmitter - A component that transmits an audible signal by using it to
modulate a high-frequency inaudible carrier signal.
VHF (Very High Frequency) - Refers to radio waves in the 30 - 300
megaHertz range.
VU - Short for “ Volume Unit. ” A unit of measurement utilized by audio
devices that denotes relative signal strength. 0 VU is generally taken to
indicate unity gain (no boost or attenuation).
Wave - Refers to the transference of energy in a regular, back-and-forth
vibration.
Wavecycle - One single backwards-and-forwards motion of a wave.
Crystal controlled
50 mW Ma . (FCC Regulation)
Internal dipole
174.60 MHz to 213.20 MHz,
13 frequencies
300 ft.
174.60 MHz to 213.20 MHz,
13 frequencies
13
F3E
15 dB p @ s/n 55 dB
(Audio @ 1 kHz, deviation 15 kHz)
Crystal controlled
50 ppm
65 (W) 22 (H) 110(D) mm
37 (W) 173 (H) mm
90 grams
Operating Range
Radiating Harmonic and
Less than -43 dB below carrier frequency
50 Hz to 15 kHz ±3 dB
15 kHz Deviation (Input: -20 dB)
Greater than 100 dB (IHF-A weighted)
-20 dB Adjustable (Af=±15 kHz)
Less than 1% (@ 1 kHz)
9 volt alkaline
18 hours nominal
Spurious Emission
Frequency Response
Modulation
Signal To Noise Ratio
Ma imum Input Level
T.H.D.
Battery Type
Battery Life (9-volt alkaline)
Current Consqpiption
VT2L I VT2G
VH2
Controls
VT2L / VT2G
LED Indicator
Dimensions
VT2L I VT2G
VH2
Weight