Cerwin-Vega T-680 Microphone User Manual
Contents
1. NOTE The LED does not provide an indication of battery condition If there is any question as to the condition of the battery it should be replaced prior to use of the transmitter 5 Turn on the microphone in the transmitter via the switch on the bottom of the unit toward the dot Make an initial adjustment of the microphone gain control of about one quarter turn from the minimum fully counterclockwise position 6 With the receiver and transmitter on the SQUELCH indicators on the receiver should be illuminated Observe the RF level meter or bargraph on the receiver If the meter does not read well above midscale when the transmitter is within a clear 50 foot radius of the receiver difficulties are indicated refer to section In Case of Difficulty 7 Speak into the microphone at normal voice level The audio meter on the associated receiver should indicate audio on voice peaks and the audio should be audible on the associated monitoring equipment The audio may also be monitored on headphones plugged into the receiver monitor jack 8 Adjust the transmitter audio gain control if necessary When speaking or singing very loudly the LED on the transmitter should flash on only on the very loudest voice peaks This indicates that the transmitter is reaching the point where soft gain compression is occurring in the microphone preamplifier If the system is correctly set up the compression point will be2. such problem Vega offers a free computerized frequency selection service to purchasers of our equipment If the frequency of other wireless equipment to be used in a given area is known interference free frequencies can be chosen However if equipment is added later without frequency coordination it is likely that an interference problem will exist Should this occur contact the Vega factory or your sales representative for assistance Many individuals believe that only a few wireless systems may be used in an area This is incorrect because installations with a dozen or more wireless systems are not uncommon However careful frequency coordination is essential Lights Antenna Placement Scaffolding nl Shielding Weak Poor Quality Batteries J Metal iy Electric Objects Cables 7 Common Sources of Interference 10 T 680 Series Receiver Noise Vega wireless microphone receivers are designed to be extremely sensitive Although high performance squelch circuits are provided it is not unusual for the receiver squelch to open and let through audio noise when the transmitter is off This is usually due to spurious outputs from two way radio transmitters adjacent channel leakage from TV transmitters and in some cases RF noise from digital equipment such as audio and video effects generators computers and other industrial equipment that might be located near the antennas When the w
3. I VEGA Vega T 680 Series UHF PRO PLUS Wireless Microphone Owner s Manual T 689 T 682 T 687 T n T 688 099 0054B 2 T 680 Series A Word to Vega Users In selecting Vega wireless microphones you are in the company of audio professionals worldwide Leadership for over 30 years has made Vega synonymous with wireless microphones Vega equipment provides superb sound quality outstanding performance and durability needed for years of successful operation Unpacking Unpack and save cartons for storage or reshipping Verify the equipment shown as shipped has been received in good condition If for any reason you do not find the equipment to be completely satisfactory please immediately contact your Vega dealer or the Vega factory Should service ever be required remember your authorized Vega service dealer knows your equipment best They have the training and test equipment necessary to restore your equipment to its peak performance Please feel free to contact either your authorized Vega dealer or the Vega factory for information or assistance at any time Quick Start See below for a description of transmitter controls and the next page for setup If this is the first time you are setting up a wireless system carefully read all manuals furnished with your equipment to ensure optimal performance Windscreen Power Switch Turns power on and off Power is on when switch is pushed toward t
4. airs finish or appearance items malfunction due to abuse or operation under other than the specified conditions nor to incidental or consequential damages Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation may not apply to you This warranty gives the customer specific legal rights and there may be other rights which vary from state to state Vega authorized service centers enable Vega to give customers immediate service on repairs These service centers are fully qualified and equipped to handle the servicing of Vega equipment and turnaround time is excellent To obtain the address of your nearest authorized warranty service center contact your dealer or the factory If you should require service pack the equipment carefully and return it to the factory service center or the nearest authorized service center Wireless Microphones 11 Important Claims Be sure the exact return address and a description of the symptoms are enclosed inside the package with your equipment It s also advisable to return the transmitter and receiver for a full system performance test when practical Factory Service Center Vega 9900 E Baldwin Place El Monte CA 91731 2294 626 442 0782 No liability will be accepted for damages directly or indirectly arising from the use of our materials or from any other causes Our liability shall be expressly limited to replacement or repair o
5. e Vega factory or your sales representative for assistance in selecting antennas for unusual applications Antenna Placement No matter what type of antenna is used care must be used in positioning and mounting In all cases a clear and unobstructed line of sight path between the receiving antenna and the transmitter is required The receiving antenna may be concealed behind fabric thin plastic acoustic tile and thin plywood without significantly affecting performance However close proximity to metallic objects such as furniture lighting fixtures scaffolding electrical cables metal structural members aluminum window frames and equipment cabinets must be avoided Whip and dipole antennas require at least a 5 inch 0 13 m minimum spacing from metal surfaces Other types of antennas may require greater spacings The radiation pattern of these antennas is much larger than the antenna itself Consequently even objects well off to one side of the line of sight path can distort the antenna pattern affecting performance Also often overlooked are the effects of using metal brackets for physical mounting of the receiving antenna Vega s magnetic mount and ground plane antennas are designed to mount on a flat metal plate and on an antenna mast respectively but many types of antennas are not The manufacturer s recommendations should be followed when using Yagis and other types of specialized antennas The use of long cables connecting the a
6. f defective materials 12 T 680 Series T 680 Series Transmitter Specifications Operating Frequency Emission Modulation RF Frequency Stability RF Output Power Spurious Radiation Audio Processor Acoustic Input Range Controls Indicator Modulation Limiting Compressor Antenna Battery Length Weight 494 608 614 806 MHz Direct FM crystal controlled 180KF3E 75 kHz maximum deviation 0 002 150 mW nominal or 40 mW nominal depending on version 40 dB below carrier minimum typically 50 to 55 dB below carrier DYNEX III At maximum gain typically 112 dB SPL for onset of compression maximum acoustic input 143 dB SPL Power on off microphone on off microphone gain Audio compression Per FCC requirements soft compressor action 25 dB range typically system distortion is less than 0 4 at 25 dB compression Patented Internal dipole 9 V alkaline Duracell MN1604 recommended Varies by model from 9 85 in 25 cm to 10 75 in 27 3 cm Varies by model from 9 oz 256 g to 13 5 oz 385 g including battery UHF PRO PLUS System Specifications with R 662A or R 662B receivers Working Range Audio Frequency Response Total Harmonic Distortion Intermodulation Distortion Ultimate S N Dynamic Range 1 700 ft under good conditions 500 ft or more under typical conditions with standard whip antennas Depends upon microphone element and electronics 90 Hz to 15 kHz 1 5 dB 120 H
7. he dot Microphone Switch Turns mic audio on off without turning transmitter off Audio is on when switch is pushed toward the dot KG M so corresponding Audio Peak LED Mic Gain Control TU on receiver s VU meter Flashes on audio peaks nominally reads O on indicates audio limiter audio peaks has been activated due to high sound levels Wireless Microphones LOCKWISE 5 NG Unlatch cover and insert a 9 volt battery Slide 9 volt battery into compartment with the plus terminal as shown above Slide cover back on Turn the transmitter Power P on and Microphone M on by sliding the switches toward the dots In the area covered by the wireless system verify the receiver is receiving by observing its indicators see receiver instructions for details With a small screwdriver adjust transmitter mic level so the receiver s AUDIO LEVEL LED flashes only when speaking very loudly If it flashes frequently turn it counterclockwise If it doesn t flash at all turn it clockwise Adjust mixer preamp amplifier to its normal setting Speak into mic If necessary adjust receiver s audio output level until wireless system volume matches wired system volume see receiver instructions for details Walk the coverage area to check for problems If there is a problem c
8. heck mic batteries fresh ensure antennas aren t touching each other or any metal objects Path between transmitter and receiver must be clear for proper operation 4 T 680 Series Compatibility T 680 Series mics are designed to work with Vega s Model 662 Series receivers T 680s are not necessarily compatible with other receivers especially if not purchased together System receivers must use DYNEX III audio processing and use precisely the same frequencies as the transmitters The transmitters are not compatible with other manufacturers receivers T 680 Series mics work in the 494 to 608 MHz and 614 to 806 MHz UHF range The exact frequency is marked on the data label inside the transmitter s battery compartment If the transmitter and receiver frequencies are not precisely the same the frequency of one of the units must be changed It s advisable to return both units to the factory or authorized service location when changing frequencies to ensure the best results Because of the very high performance of these units and the specialized test equipment required to adjust them properly users should not try to change frequency themselves If two or more systems are used at the same location proper frequency selection and spacing are required to avoid possible interference Vega offers a free frequency coordination service for purchasers of its equipment Frequencies are selected by computer to avoid any possible interference fro
9. ireless transmitter is on this noise is suppressed and rarely causes any difficulties However if the audio channel is left open with the transmitter off loud blasts of noise might occur For this reason it is advisable to fade the receiver audio when the transmitter is not in use Changing the placement of the antennas and in some extreme cases changing the operating frequency might be necessary to minimize these problems Antennas Cables As noted in the section on antennas above antenna placement and mounting are vitally important Blocking the antenna with metallic objects reduces the signal level and might cut off the signal entirely pattern nulls If there is a coverage problem try moving the receiving antenna particularly if there are nearby metallic materials Vega FaxBack Information including more detailed procedures schematics and other Vega products is available 24 hours per day from Vega s FaxBack system Simply call 626 444 2017 or 800 274 2017 then follow the voice instructions Warranty Limited All Vega PRO PLUS wireless products are guaranteed against malfunction due to defects in materials and workmanship for one year beginning at the date of original purchase If such a malfunction occurs the product will be repaired or replaced at our option without charge during the one year period if delivered to the Vega factory Warranty does not extend to damage due to improper rep
10. ly to the wireless receiver is adequate for many installations This type of antenna is provided with the R 662 Series receivers When the distance between the receiver and the transmitter is 100 to 200 feet 30 60 m or less and there is a clear unobstructed line of sight path between the receiver and the transmitter good results can usually be obtained Optional Antennas If you wish to have the receiver in a location which does not have a clear line of sight path to the transmitter another type of antenna will be needed Vega offers magnet mount 1 4 wave whip and ground plane antennas with an attached 15 foot 4 6 m cable which may be used for this purpose Two such antennas are required for use with diversity receivers Other types of antennas may be needed for unusual applications such as operating at extreme ranges of 500 feet 150 m or more Vega offers a high gain log periodic antenna that covers the complete operating frequency range of the R 662 receiver UHF TV antennas with appropriate matching transformers are often used for this purpose A wide bandwidth corner reflector antenna works well in this application d Log Periodic Antenna Ground Plane Antenna Wireless Microphones UHF communications antennas are also sometimes used for specialized requirements However such antennas are usually narrow band and must be modified to function properly in the 494 to 608 MHz and 614 to 806 MHz ranges Contact th
11. m other wireless systems and broadcast stations To take advantage of this free service contact the Vega factory or your local sales representative phone number on last page of this manual The T 680 Series professional handheld transmitters are self contained units and require only a battery and a compatible receiver for operation Individual models in the T 680 Series each use different types of microphone elements leading to some differences in physical appearance between the various models However all transmitters in this series are functionally equivalent and the operation instructions below and other information in this manual are applicable to all models Because of the acoustic characteristics of the various types of microphone elements individual models in this series may sound significantly different from other models These differences are entirely due to the microphone element all models offer identical performance otherwise Wireless Microphones Operating Instructions 1 Verify that the associated wireless microphone receiver is on the exact same frequency as the T 680 Series transmitter to be used 2 Set up adjust and connect the receiver as described in its instruction manual 3 Verify that the transmitter s battery is fresh 4 Turn on the transmitter via the switch on the bottom toward the dot The LED indicator should flash briefly upon turn on this indicates that the battery is installed properly
12. ntenna to the receiver is strongly discouraged At UHF frequencies the signal loss in the cable rapidly builds up and can seriously degrade operating range 8 T 680 Series In Case of Difficulty The majority of difficulties with Vega wireless mics are not due to equipment failure Vega equipment is fully tested before leaving the factory In most instances problems are due to equipment application The following paragraphs describe the most commonly encountered application problems If you are having difficulties with Vega equipment please review this information and take any necessary corrective action prior to returning the equipment for repair Most users of Vega equipment enjoy years of troublefree operation However as with all electronic devices problems might be encountered eventually If you experience difficulty with your Vega wireless microphone within the first year of operation it will be repaired under warranty see below Service for older units may also be obtained from Vega contact the factory or your sales representative for information General Contact the Vega factory or your sales representative prior to returning equipment for repair Often the problem can be resolved by phone avoiding downtime for unnecessary returns However should repairs be necessary Vega will promptly correct the problem and return the unit Return both the transmitter and the receiver to allow us to perform a complete checkout and tes
13. reached only rarely Internal adjustments are not required for normal operation Only qualified experienced technicians should open the case Unauthorized adjustments or repairs inside the equipment case can void your warranty and cause unnecessary repair cost If you feel that internal adjustments or repairs are needed we recommend you contact the factory or your nearest authorized service center 10 Walk the coverage area to ensure that there are no areas of poor coverage Signal dropouts little or no signal in small areas show up as a flickering of the SQUELCH indicator on the receiver and a brief fizzing sound in the audio which may or may not be followed by a silent period due to squelched audio The audio may be conveniently monitored with headphones plugged into the front panel MONITOR jack on the receiver If there is an area where a dropout occurs the receiving antenna s can usually be repositioned to eliminate the problem Frequently a change of just a few inches in location will completely solve the problem 6 T 680 Series Antennas The receiver antenna may be the most important single component in a wireless microphone system However this is the item most often overlooked in setting up a system and is frequently the cause of quite unnecessary problems Proper placement of the receiving antenna s is vitally important in any wireless microphone system A whip antenna connected direct
14. return to the factory or authorized service center Wireless Microphones Interference Vega wireless microphone systems have been specifically designed to reject interference However interfering signals might fall directly on the receiver frequency making it impossible to avoid problems completely As mentioned above this can be a particular problem if the receiver audio is left open when the transmitter is turned off Problems with RF noise sources fluorescent lights digital effects generators industrial equipment etc are quite rare However defective fluorescent lighting fixtures can generate astonishing amounts of RF energy Usually repairing the fixture will cure the problem because normally functioning fixtures almost never cause trouble Some digital audio and video signal processing equipment and effects generators also can generate substantial amounts of broadband noise When this situation exists nothing can be done to the wireless equipment to correct the problem that will not seriously degrade performance The receive antennas should be positioned away from these sources of RF noise to minimize the effect of this interference Fortunately this type of problem is surprisingly rare A more serious problem is selection of wireless microphone operating frequencies which are inherently subject to interference due to intermodulation Fortunately a proper initial selection or changing frequencies will almost always correct any
15. t of the entire system This can be especially helpful for elusive or intermittent problems Battery The most common problems with wireless microphone systems are those related to the batteries Vega recommends that only new fresh Duracell MN1604 or Eveready Energizer No 522 alkaline batteries be used No other batteries tested by Vega provide equal life and reliability Other batteries might work but battery life probably will be short and current inadequate Rechargeable batteries ni cads are not recommended for use with T 680 transmitters Their limited capacity does not provide adequate operating time Exhausted batteries will cause numerous problems including distortion audible squeals and howls poor range and off frequency operation It is strongly recommended that the battery be checked prior to each use and that it be replaced if there is any question about its condition It is also good practice to try replacing the battery with a fresh unit in the event of any sort of problem with the system because a low battery might affect system operation in subtle ways Battery contacts must be clean and unbroken Attempted forced reverse insertion of a battery is practically impossible but the attempt will often damage the battery contacts Some 9 volt batteries sold are larger or smaller than standard and either might fail to work or might damage the contacts when inserted Damage to the contacts usually requires a
16. z to 12 kHz 0 75 dB units include highpass filter to minimize handling noise extended low frequency response available on special order lt 0 25 400 Hz nominal input level lt 0 25 SMPTE 60 7 000 Hz 4 1 Microphone off 101 dB flat minimum 108 dB typical A weighted Microphone on varies by element type and gain setting typically over 100 dB A weighted at normal gain settings Varies by element type and gain setting typically over 100 dB over 125 dB with gain adjustment Patent 4 344 184 issued August 10 1982 VEGA www vegawireless com 9900 East Baldwin Place El Monte California 91731 2294 Telephone 626 442 0782 Toll Free 800 877 1771 Fax 626 444 1342 CompuServe 73513 1417 FaxBack 626 444 2017 Toll Free FaxBack 800 274 2017 Printed in U S A April 2000 Vega
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