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Vega T-680 Series
UHF PRO-PLUS Wireless Microphone
Owner's Manual
T-689
T-682
T-687
T-688
099-0054B
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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
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Wireless-Microphones 3 1 2 Unlatch cover and insert a 9-volt battery. Turn the transmitter Power “P” on and Slide 9-volt battery into compartment with the plus Microphone “M” on by sliding the switches “+” terminal as shown above. Slide cover back toward the dots. on. 3 4 In the area covered by the wireless system, With a small screwdriver, adjust transmitter verify the receiver is receiving by observing mic level so the receiver's “AUDIO LEVEL” its indicators (see receiver instructions for LED
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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
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Wireless-Microphones 5 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.
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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 directly to the wireless receiver is adequate for many installations. This type of antenna is provided with the R-662 Ser
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Wireless-Microphones 7 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 the 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 unobstruc
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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.
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Wireless-Microphones 9 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.
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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, an
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Wireless-Microphones 11 Important: 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 Claims No liability will be accepted for damages directly or indirectly arising from the use of our materials or from any other causes. Our liabi
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12 T-680 Series T-680 Series Transmitter Specifications Operating Frequency: 494-608, 614-806 MHz Emission/Modulation: Direct FM, crystal controlled, 180KF3E; 75-kHz maximum deviation RF Frequency Stability: ±0.002% RF Output Power: 150 mW, nominal or 40 mW nominal, depending on version Spurious Radiation: 40 dB below carrier, minimum; typically 50 to 55 dB below carrier Audio Processor: DYNEX®III Acoustic Input Range: At maximum gain typically 112 dB SPL for onset of compression; maximum acoust
