VocoPro Microphone VHF 3300 User Manual

Features:  
Dual-Antenna Receiver design doubles as a Mic Charger/Holder  
Squelch Circuitry Eliminates Background and RF Noise Bursts  
VHF band Quartz Lock for drift-free operation  
Auto-mute circuitry provides noiseless ON/OFF switching  
Individual front panel Volume controls for precise vocal level mixing  
Dual 1/4” unbalanced outputs for separate and mixed signal output  
Excellent operating range up to 150 feet.  
Dual front panel RF LED indicators  
19” rackmountable to occupy a single rack space with included mounting brackets  
Built-in charger on top of reciever both rechargers mic batteries and secures mics when not  
in use  
VHF-3300  
ON  
WIRELESS VHF DUAL CHANNEL  
RECHARGEABLE MIC SYSTEM  
RF  
RF  
OFF  
POWER  
CH. A  
VOLUME  
CH. B  
VOLUME  
VHF-3300  
Dual Channel Rechargeable Wireless Microphone System  
 
Safety Instructions  
8. Ventilation - The appliance should be situated so its  
location does not interfere with its proper ventilation. For  
example, the appliance should not be situated on a bed,  
sofa, rug, or similar surface that may block the  
ventilation slots.  
CAUTION  
RISK OF SHOCK  
9. Heat - The appliance should be situated away from  
heat sources such as radiators, heat registers,  
stoves, or other appliances (including amplifiers)  
that produce heat.  
CAUTION: To reduce the risk of electric shock,  
do not remove cover (or back). No user-  
serviceable parts inside. Only refer servicing to  
qualified service personnel.  
10. Power Sources - The appliance should be  
connected to a power supply only of the type described  
in the operating instructions or as marked on the  
appliance.  
Explanation of Graphical Symbols  
The lightning flash & arrowhead  
symbol, within an equilateral triangle,  
is intended to alert you to the  
presence of danger.  
11. Grounding or Polarization - Precautions should be  
taken so that the grounding or polarization means of  
an appliance is not defeated.  
12. Power-Cord Protection - Power-supply cords  
should be routed so that they are not likely to be walked  
on or pinched by items placed upon or against them,  
paying particular attention to cords at plugs,  
convenience receptacles, and the point where they exit  
from the appliance.  
The exclamation point within an  
equilateral triangle is intended to alert  
you to the presence of important  
operating and servicing instructions.  
WARNING  
To reduce the risk of fire or electric shock, do  
not expose this unit to rain or moisture.  
13. Cleaning - Unplug this unit from the wall outlet  
before cleaning. Do not use liquid cleaners or  
aerosol cleaners. Use a damp cloth for cleaning.  
14. Power lines - An outdoor antenna should be  
located away from power lines.  
1. Read Instructions - All the safety and operating  
instructions should be read before the appliance is  
operated.  
15. Nonuse Periods - The power cord of the appliance  
should be unplugged from the outlet when left unused  
for a long period of time.  
2. Retain Instructions - The safety and operating  
16. Object and Liquid Entry - Care should be taken so  
that objects do not fall and liquids are not spilled into the  
enclosure through openings.  
instructions should be retained for future reference.  
3. Heed Warnings - All warnings on the appliance and in  
the operating instructions should be adhered to.  
17. Damage Requiring Service - The appliance should  
be serviced by qualified service personnel when:  
4. Follow Instructions - All operating and use  
instructions should be followed.  
A. The power supply cord or plug has been damaged; or  
B. Objects have fallen into the appliance; or  
C. The appliance has been exposed to rain; or  
D. The appliance does not appear to operate normally  
or exhibits a marked change in performance; or  
E. The appliance has been dropped, or the enclosure  
damaged.  
5. Attachments - Do not use attachments not  
recommended by the product manufacturer as they may  
cause hazards.  
6. Water and Moisture - Do not use this unit near water.  
For example, near a bathtub or in a wet basement and  
the like.  
18. Servicing - The user should not attempt to service  
the appliance beyond that described in the operating  
instructions. All other servicing should be referred to  
qualified service personnel.  
7. Carts and Stands - The appliance should be used  
only with a cart or stand that is recommended by the  
manufacturer.  
Note:  
7 A. An appliance and cart combination  
should be moved with care. Quick stops,  
excessive force, and uneven surfaces may  
cause an overturn.  
To CATV system installer's (U.S.A.): This reminder is  
provided to call the CATV system installer's attention to  
Article 820-40 of the NEC that provides guidelines for  
proper grounding and, in particular, specifies that the  
cable ground shall be connected as close to the point of  
cable entry as practical.  
1
 
VHF-3300  
Dual Channel Wireless Microphone System  
Contents  
Introduction  
Specifications  
ELEMENT:  
Safety Instructions..............................  
Welcome……………………………….  
Specifications.....................................  
Listening For a Lifetime………………  
1
2
3
4
PRESSURE GRADIENT TRANSDUCER  
POLAR PATTERN:  
Getting Connected  
Connecting the VHF-3300.................  
Microphone Battery Installation..........  
Charging Batteries..............................  
UNI-DIRECTIONAL  
5
5
5
FREQUENCY:  
20HZ~20KHZ  
Descriptions and Controls  
Front Panel ........................................  
Rear Panel.........................................  
Microphone.........................................  
6
6
7
SENSITIVITY:  
-33dB 2dB(0dB=1V/PA AT 1KHZ)  
Microphone Basics  
OUTPUT IMPEDANCE:  
The Proximity Effect ………….............  
Feedback.............................................  
Placement and Tone Quality...............  
Stage Monitors/P.A. Loudspeakers.....  
7
8
8
8
200  
30%(AT 1KHZ)  
LOAD IMPEDANCE:  
Operations  
>
1000  
Operating the System..……….............  
Achieving Optimum Performance........  
Auto-Noise Squelch Feature...............  
Reciever Volume Adjustment..............  
9
9
9
9
SELF NOISE:  
16dB A  
Troubleshooting  
Problems and Solutions..…….............  
MAX INPUT S.P.L:  
10  
>
135dB(AT 1KHZ 1% THD)  
S/N RATIO:  
78dB  
OPERATING VOLTAGE:  
DC 48V PHANTOM( 5V)  
3
 
Listening For A Lifetime  
Selecting fine audio equipment such as the unit you've just purchased is only the start of your musical enjoyment. Now it's  
time to consider how you can maximize the fun and excitement your equipment offers. VocoPro and the Electronic  
Industries Association's Consumer Electronics Group want you to get the most out of your equipment by playing it at a  
safe level. One that lets the sound come through loud and clear without annoying blaring or distortion and, most  
importantly, without affecting your sensitive hearing.  
Sound can be deceiving. Over time your hearing 'comfort level' adapts to a higher volume of sound. So what sounds  
'normal' can actually be loud and harmful to your hearing. Guard against this by setting your equipment at a safe level  
BEFORE your hearing adapts.  
To establish a safe level:  
• Start your volume control at a low setting.  
• Slowly increase the sound until you can hear it comfortably and clearly, and without  
distortion.  
Once you have established a comfortable sound level:  
• Set the dial and leave it there.  
• Pay attention to the different levels in various recordings.  
Taking a minute to do this now will help to prevent hearing damage or loss in the future. After all, we want you listening for  
a lifetime.  
Used wisely, your new sound equipment will provide a lifetime of fun and enjoyment. Since hearing damage from loud  
noise is often undetectable until it is too late, this manufacturer and the Electronic Industries Association's Consumer  
Electronics Group recommend you avoid prolonged exposure to excessive noise. This list of sound levels is included for  
your protection.  
Some common decibel ranges:  
Level  
Example  
30  
40  
50  
60  
70  
80  
Quiet library, Soft whispers  
Living room, Refrigerator, Bedroom away from traffic  
Light traffic, Normal conversation  
Air conditioner at 20 ft., Sewing machine  
Vacuum cleaner, Hair dryer, Noisy restaurant  
Average city traffic, Garbage disposals, Alarm clock at 2 ft.  
The following noises can be dangerous under constant exposure:  
Level  
Example  
90  
Subway, Motorcycle, Truck traffic, Lawn mower  
Garbage truck, Chainsaw, Pneumatics drill  
Rock band concert in front of speakers  
Gunshot blast, Jet plane  
100  
120  
140  
180  
Rocket launching pad  
-Information courtesy of the Deafness Research Foundation  
4
 
Getting Connected  
Connecting the VHF-3300  
To get your system up and running in just a few minutes, follow the quick start instructions on this page:  
1. Connect the AC power adapter to the receivers power connector, then plug the adaptor into an AC electrical outlet.  
2. Connect the receiver to a mixer or sound system with either one of the 1/4" output jacks for mixed output or use both 1/4" output  
jacks for separate channel output. The advantage of combining both mics to a single output is only occupying one channel of an external  
mixer/amplifier, but the disadvantage would be that adjustments in mic volume, tone, and external effects cannot be isolated to each mic. When  
using both outputs provided with separate line cables, you will be able to make adjustments to each mic individually, but you will use 2 channels of  
your external sound system.  
Microphone Battery Installation  
Press down on grooved tab at the base of the microphone and push out in the direction of the arrow to open battery compartment. Insert a new  
rechargeable 9-volt alkaline battery.  
Warning! The VHF-3300 can be operated with non-rechargeable batteries, but DO NOT place microphone back in the recharger with regular  
batteries installed, even if the power is turned off! CHARGING A REGULAR NON-RECHARGEABLE BATTERY MAY CAUSE THE BATTERY TO  
EXPLODE.  
Installation  
Groove Tab  
9-Volt Battery  
Charging Batteries  
When a microphone needs battery charging, with the ON/OFF switches facing towards the front panel, the chargers are making contact with the metal  
strips on the base of the microphones. When contact has been made between a charger and a mic, the CHARGE INDICATOR light will be glowing red.  
An eight-hour charge will provide you with 1 to 2 hours of continuous wireless microphone use. When the microphone is fully charged, the CHARGE  
INDICATOR light will automatically stop glowing and you can perform. Rechargeable batteries have a life of approximately 500 hours of charging and  
discharging before they will need to be replaced.  
Charging  
Charge Indicator  
Charge Indicator  
VHF-3300  
ON  
RF  
WIRELESS VHF DUAL CHANNEL  
RECHARGEABLE MIC SYSTEM  
RF  
OFF  
POWER  
CH.  
A
CH.  
B
VOLUME  
VOLUME  
5
 
Front Panel Descriptions and Controls  
1. POWER BUTTON: Turns the VHF-3300 ON/OFF.  
2. POWER ON LED: Glows RED when the receiver is powered ON.  
3. RF SIGNAL LED: Glows GREEN when Radio Frequency signals are received by antenna A and/or B.  
4. VOLUME CONTROLS: Adjusts the OUTPUT volume of the receiver’s mic channels.  
5. CHARGING TERMINAL: Makes contact with mic base to charge batteries or holds mic in between charges.  
6. CHARGING INDICATOR LIGHT: Illuminated while microphones are charging.  
Front Panel  
5
6
3
2
4
VHF-3300  
ON  
WIRELESS VHF DUAL CHANNEL  
RECHARGEABLE MIC SYSTEM  
RF  
RF  
OFF  
POWER  
CH. A  
VOLUME  
CH. B  
VOLUME  
1
Rear Panel Descriptions and Controls  
1. TELESCOPING ANTENNAE: Receives the SIGNALS sent from the microphones.  
2. OUT A & B: These 1/4” jacks provide mic output for connection to amplifiers and mixing consoles.  
3. POWER INPUT: Accepts POWER from supplied AC adaptor.  
Rear Panel  
1
2
3
OUTPUT  
0~400 MV  
CAUTION  
LA VERNE CALIFORNIA  
U
WWW.VOCOPRO.COM  
S
A
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
ANT.B  
CH A  
CH B  
DC 12V  
ANT.A  
(FOR MIXED OUTPUT USE EITHER CH. A/B TO  
OUTPUT MIXED MIC SIGNAL WITH SINGLE CABLE)  
A
A
6
 
Microphone Descriptions and Controls  
Microphone  
1
1. GRILL: Protects the microphone cartridge and helps reduce breath  
sounds and wind noise via enclosed foam windscreen.  
2. POWER BUTTON: Places the microphone in ON/OFF or STANDBY  
(center position) modes.  
3. BATTERY COVER: Removeable cup holds and protects the  
rechargeable microphone battery.  
2
3
Microphone Basics  
The VHF-3300's ability to pick-up extremely high and low frequencies makes it an excellent choice. We have provided a few tips to help get the best  
performance out of your VHF-3300.  
Understanding the Proximity Effect  
The Proximity Effect is a resulting boost to the low-frequency range of sounds that occur with the close-up use of microphones designed with a uni-  
directional polar pattern, such as the VHF-3300. When the sound source is less than a ¼" from the microphone capsule, the boost is generated mostly  
in the 100Hz range by 6dB to 10dB. In other words, when a sound source is less than a ¼" from the microphone, the sound will be output with a  
stronger and richer bass tone than if the sound source was farther away from the microphone.  
While the proximity effect can intentionally be used as an advantage to enhance some voices, it may have an undesired effect on certain vocal ranges.  
It is really a matter of preference and depends on the singer. To avoid a lessened sound quality when using the proximity effect, keep these tips in mind:  
Always try to use available EQ or tone controls on external equipment to enhance a sound before trying to make use of Proximity Effect.  
When experimenting with Proximity Effect for the first time, try it in a small room with moderately low volume and no tone or effects adjustments to get  
a sense for whether it can be of use to you.  
Do not try to enhance a sound source without performing a sound check at the location prior.  
Do not rely on the proximity effect to "change" a persons voice. Rather use it to enhance one's voice.  
Avoid the proximity effect in environments with excessive reverb, (cathedrals, school gymnasiums, large dancehalls etc).  
Try to avoid the proximity effect when connected to high-output amplifiers and loudspeakers.  
Remember that when speaking into a microphone, "plosive" words can generate loud pops which will also be boosted by the proximity effect leading  
to a possible threat to external sound equipment.  
7
 
Microphone Basics cont...  
Feedback  
Feedback is the phenomenon that occurs when an amplified sound from any loudspeaker reenters the sound system through any open microphone and  
is amplified over and over again. The resulting sound is an annoying howl that (when loud enough) poses a serious threat to not only your speakers, but  
to your ears as well. Most commonly, feedback is caused by the following conditions:  
Placing loudspeakers too close to the microphones.  
Having too many open active microphones.  
Overemphasis/boosting high-frequency tone controls.  
Performing in environments with high ratios of hard and reflective room surfaces.  
Overemphasis of effects that generate multiple harmonic repetitions (reverb, echo, delay)  
What can you do if feedback occurs before the sound system is loud enough?  
Request that the singer/speaker project their voice louder into the microphone allowing for a lower master volume.  
Reduce the distance from the talker to the microphone. Each time this distance is halved, the sound system output will increase by 6dB, mainly in the  
low-frequency range.  
Reduce the number of open microphones.  
Move the loudspeaker farther away from the microphone.  
Move the loudspeaker closer to the listener.  
Use an equalizer/feedback reducer to cut the frequency bands in which the feedback occurs.  
Microphone Placement and Tone Quality  
The VHF-3300 is ideal for close-up vocals and the mic can be handheld or mounted in a mic stand. Keep in mind that microphone technique is largely a  
matter of personal taste--there is no one "correct" microphone position.  
Lead and Backup Vocals  
The performer's mouth should be less than 3” from or even touching the windscreen on an axis to the microphone. Doing this creates a robust sound,  
emphasizes bass and provides maximum isolation from other sources  
Speech  
For spoken segments in between songs or public speaking types of applications of the VHF-3300, place the mic 4” to 10” away from your mouth, just  
above nose height for a natural sound with reduced bass. You can also place the microphone 8” to 16” away from the mouth, slightly off to one side, for  
a more “ambient” sound with greatly reduced bass and minimal “S” or sibilance sounds.  
The VHF-3300 & Stage Monitor/P.A.. Loudspeakers  
If you will be using the VHF-3300 with stage monitors and/or a P.A.. system, try the following:  
Place the stage monitor(s) directly behind the microphones.  
Locate the loudspeakers so that they point away from the rear of the microphone. (With the speakers located in these positions, the possibility of  
feedback is greatly reduced).  
Always check the stage setup before a performance to ensure optimum placement of microphone and monitors.  
IMPORTANT: Every wireless microphone installation is a unique situation, and can present a variety of problems. Never attempt a live performance  
without first conducting a test of the system in the performing area. If major changes (additional wireless systems or intercoms, relocation of set up,  
etc.) have been made since the last test, check the wireless system again--as close to performance time as possible.  
8
 
Operations  
Operating the System  
1. Press the receiver POWER switch with the VOLUME CONTROLS turned down. The LED next to the POWER button on the receiver will glow RED.  
2. Switch the microphone's power button to ON. During normal operation, the RF signal LED for each mic will light GREEN.  
3. Talk or sing into the microphones while gradually adjusting the receiver VOLUME controls until you reach the desired output level.  
Tips for Achieving Optimum Performance  
-- It can be difficult to adjust VOLUME on the VHF-3300 and your sound system without creating feedback while standing so close to the receiver. It is  
recommended to have one person test the mics from a distance while another increases the VOLUME levels for a better monitoring of your sound.  
-- Place the receiver at least 3 feet (or 1 meter) above the ground and away from concrete walls or metal surfaces to prevent any reflections. The  
microphone should also be at least 3 feet away from the receiver's antenna.  
-- If using multiple wireless systems, maintain a distance of at least 10 feet (3 meters) between each.  
-- Maintain a line-of-sight between the microphone and receiver antennas, if possible.  
-- Avoid placing the receiver near computers or other RF generating equipment.  
-- Avoid placing the reciever at the bottom of an equipment rack.  
-- Extend telescopic antennas completely and as far apart from each other as possible. They can rotate in opposing directions to facilitate this.  
-- Position the microphone 1" to 1.5" from the mouth or as close as practical to the desired sound source.  
-- Move the mic closer to your mouth for extra bass response.  
-- Use only one microphone per person or sound source.  
-- Place microphones far from sound-reflecting surfaces.  
-- Add a windscreen when using the microphone outdoors, for close-up speech, or vocals.  
-- Avoid excessive handling to minimize mechanical noise.  
Auto-Noise Squelch Feature  
Squelch circuits analyze Radio Frequency (RF) signal strength. When a wireless system is used in a noisy RF environment, conventional ciruits may  
"open" unexpectedly, sending loud bursts of noise through the reciever when the transmitter's signal is weak or turned off. The VHF-3300 uses a noise  
squelch circuit that analyzes signal quality with the signal strength. When the transmitter signal is strong, the system's noise level is low and the reciever  
sends audio through. When the transmitter signal is weak or absent, the system's noise level is high and squelch circuit will mute the receiver. This  
virtually eliminates the possibility of annoying bursts of noise coming through your receiver.  
Receiver Volume Adjustment  
The volume controls on the front panel of the VHF-3300 receiver can be adjusted to set the wireless system output levels as you desire. After making  
any musical balancing adjustments, adjust the receiver volume control until the output reaches the desired level. Rotate the volume control clockwise to  
increase output. Rotate it counterclockwise to decrease output.  
9
 
Troubleshooting  
PROBLEMS  
SOLUTIONS  
No sound; receiver RF light(s) and mic(s) not lit.  
Make sure POWER switches on transmitters and  
receiver are set to ON positions.  
.
Check microphone batteries to ensure they are  
providing power.  
Replace or charge batteries if necessary.  
Check receiver's AC power connection.  
Make sure antennas are in the microphones' line of  
sight.  
If necessary, reduce the distance between the  
microphones and reciever.  
.
No receiver sound but the RF and Audio Level meter  
lights are glowing.  
Turn up the receiver's VOLUME level controls.  
Check for proper connection between receiver and  
external amplifier/mixer.  
Talk into the mic and observe the receiver's RF signal  
LEDs. If they glow, the problem is elsewhere in the  
sound system.  
Received signal is noisy or contains interference with  
transmitter on.  
Check microphone batteries and charge or replace if  
power is low.  
Remove local sources of RF interference, such as  
lighting equipment. Two transmitters may be operating  
at the same frequencies or frequencies which are too  
close in proximity. Turn one off or exchange for one  
with a different frequency. Signal may be too weak. If  
so, reposition antenna (If possible, move them close to  
the transmitter).  
Noise coming from the receiver with the mics turned  
OFF.  
Remove local sources of RF interference, such as  
lighting equipment.  
Reposition the receiver or antennae.  
Momentary loss of sound as transmitter is moved  
around performing area.  
Reposition receiver and perform a "walkthrough" test  
and observe the signal strengths. If audio droppouts  
persist, mark these "dead spots" in the performing  
areas and avoid them during the performance.  
Battery running low even after recharging.  
Replace rechargeable batteries (rechargeable  
batteries have a life of 500 hours of charging and  
recharging).  
1 0  
 

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