Vega U2020UHF Wireless

Microphone System

V0990104 Rev. D

A Word to Vega UsersIn selecting Vega wireless microphones, you are in the company of audio professionalsworldwide. Leadership for over 30 years has made “Vega” synonymous with wirelessmicrophones. Our equipment provides superb sound quality, outstanding performance, andthe durability needed for years of successful operation.

Caution!!!Vega UHF wireless microphone systems must be licensed by the FCC before operation.There are some restrictions on the issuance of such licenses; if you are not aware of therules for licensing, contact your Vega sales representative or the Vega factory.

This device complies with FCC Rule Part 15, and Industry Canada RSS-210 andOperation is subject to the following two conditions: (1) this device may not causeinterference, and (2) this device must accept any interference, including interference thatmay cause undesired operation of the device.

No adjustments should be made inside the transmitter or receiver for normaloperation or use. Due to the great possibility of causing improper operation, or evendamage to the transmitter, only qualified and experienced technicians should open the case.Unauthorized adjustments or repairs inside the equipment case can void your warranty andcause unnecessary repair costs. If you believe that internal adjustments or repairs areneeded, we recommend that you contact the factory or your nearest Vega authorized servicecenter.

Read This!1.) Vega strongly recommends using Duracell batteries in the wireless mics. Other brandsyield as little as half the operating time. 2.) When setting the mic’s channel, ensure it is inthe proper orientation (see pages 6 and 7).

UnpackingVerify the number of boxes shown as “shipped” has been received in good condition.Unpack and save cartons for storage or reshipping. If, for any reason, you do not find theequipment to be completely satisfactory, please immediately contact your Vega dealer or theVega factory.

Should service ever be required, remember your authorized Vega service dealer knows yourequipment best. They have the training and test equipment necessary to restore yourequipment to its peak performance.

2 Vega U2020 UHF

ContentsQuick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Receiver Front Panel Controls and Indicators . . . . . . . . . . . . . . . . 4Receiver Back Panel Controls and Indicators. . . . . . . . . . . . . . . . . 5Handheld Mic Controls and Indicators . . . . . . . . . . . . . . . . . . . 6Bodypack Mic Controls and Indicators . . . . . . . . . . . . . . . . . . . 7How to Set an Operating Channel . . . . . . . . . . . . . . . . . . . . 8Setup and Operating Instructions . . . . . . . . . . . . . . . . . . . . 12To Move Antennas to the Front of the Receiver . . . . . . . . . . . . . . . 12Receiver Antenna Selection and Placement . . . . . . . . . . . . . . . . . 13Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 16Warranty (Limited) . . . . . . . . . . . . . . . . . . . . . . . . . 17Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Wireless Microphone System 3

“Walk” the area7

Connect receiver2

Check RF

1 2 3 4 5

4

Quick Start

Adjust transmitter5

Turn on,check frequency

3

Same processingand frequency?

=

1

Set system

audio levels6

4 Vega U2020 UHF

Receiver Front Panel Controls and Indicators

Power Switch: The

receiver is “on” when the

switch is to the right.

Audio Level: Indicates relative audio level.

Should flash in the green zone occasionally.

Readings in the yellow zone indicates audio is

very high (in full deviation). Readings in the red

zone indicate the level is too high.

RF Signal Strength: Shows channel’s

RF level. Should read well up into the

green zone. Occasional dips into the

lower green area are ok, but consistent

readings there indicate you should take

steps to improve the signal. A reading in

the yellow zone indicates a very low

signal level. Readings in the red zone

indicate poor audio quality and loss of

the signal is likely. When the signal is

absent or below the useful range, the

RF level and audio indicators will go

“off” and the output will be squelched.

Channel Select Indictors:

Shows which channel the

receiver is operating on.

Channel Select Switches: Use

a small screwdriver to select the

desired frequency (must be the

same as the transmitter

Diversity Indicator: LEDs show which channel

is being used. In diversity mode, the LEDs

probably will switch back and forth, though at

short ranges, one LED might stay on

continuously (RF level is above the range

where diversity switching is useful). When the

receiver is squelched, one indicator will stay on.

Channel “A” antenna

mount: for mounting

antennas in front of the

receiver.

Channel “B” antenna

mount: for mounting

antennas in front of the

receiver.

Wireless Microphone System 5

“A” antenna connector:

BNC connector for supplied whip antennas.

Attenuation Switch: Switch

to select between line or mic

audio on the XLR output.

XLR Audio Output: Balanced

line or mic level audio output.

Standard, full-sized, three-pin

XLR male connector.

Receiver Back Panel Controls and Indicators

“B” antenna connector:

BNC connector for supplied whip antennas.

Squelch Adjust:

Adjusts the squelch point (both channels, A and B). Factory set at

1.8 µV (minimum setting, fully CCW, recommended setting). At the

maximum setting, the receiver will squelch at about 5.5 µV, reducing

the receiver’s sensitivity and range. Increase the squelch (turn

clockwise) when external RF noise or interference causes undesired

squelch breaking. This problem is most likely to occur when the

transmitter is turned off or at the edge of its range.

Power Input:

Use 12 Vdc power supply (supplied).

1/4” Phone Audio Output:

Unbalanced audio output.

1/4" Phone Audio Output:

Unbalanced line level audio

Audio Level Adjust: Adjusts the

audio level output.

6 Vega U2020 UHF

+

Slide the hinged battery cover open. Insert a 9-voltbattery into compartment as shown above. Slide coverback on.

1 + 0 = Channel 10

Remove channel switch cover from the mic. Hold mic head tothe right. Use a small screw driver to set the channelfrequency. When setting channel, mic head MUST be tothe right!

Mic: comes with either aN/D267,N/D5557,N/D767,or N/D967 head.

Audio Mute Switch: Turns audio onand off without turning mic power off.Audio is on when switch is pushedtoward the windscreen.

Channel Selectors: Remove cover, usea small screw driver to change channels(frequencies). Selected channel must bethe same as its associated receiver’schannel.

Power Switch: Turns battery power onand off. Power is on when switch ispushed toward the windscreen.

Audio Gain Control (side): Asmall screwdriver may be usedto increase/decrease audio gain(turn clockwise for higher gain).

Battery Low/Audio Peak LEDs:When the mic is operatingproperly, the LEDs remain off.Lights when the battery becomeslow (green LED) and when audiooverload occurs (red LED).

Handheld Mic Controls and Indicators

To Insert the Battery To Set the Channel Frequency

Audio Processing CompatibilityThe Vega Model R-2020 diversity receiver incorporates DX20® audio processing. It is partof the U2020 system and will only work with Vega HT-2020 and BT-2020 transmitters.

How to Set an Operating Channel

Select an Operating ChannelIf any TV stations in your area operate on channels between 53 and 60, use the channels onindicated in the table below. If TV channels 53-60 are not used, then any U2020 channelmay be used.* NOTE: Bands A and B, TV 60-65, are no longer actively sold.

U2020 Channel Select Table

TV Channel Present (Freq. MHz) In "A" Band use mic channels 60 (746-752) 30-9961 (752-758) 0-30, 60-9962 (758-764) 0-59, 90-9963 (764-770) 0-89

In "B" Band use mic channels62 (758-764) 9-9963 (764-770) 0-8, 39-9964 (770-776) 0-38, 69-9965 (776-782) 0-68

In "C" Band use mic channels53 (704-710) 10-9954 (710-716) 00-08, 40-99,55 (716-722) 00-38, 70-9956 (722-728) 00-68

In "D" Band use mic channels57 (728-734) 30-9958 (734-740) 00-28, 60-9959 (740-746) 00-58, 90-9960 (746-752) 00-88

U2020’s operate in the frequency range of TV channels 53 to 60.1.) Turn the channel select switches on the receiver to an appropriate channel. Withantennas attached, and the receiver connected to a sound system (see next section fordetails), turn on the power and listen for any interference from another source. Ifinterference is encountered, select another operating channel. If necessary, continue selectingchannels until a clear channel is found.

Caution: When operating more than one U2020 system at the same location, allow aspacing of at least three channels between operating channels to avoid interference betweensystems.

2.) Turn the Channel select switches on the associated HT-2020 or BT-2020 microphone, tothe same channel. Turn on the power switch, and verify that the system operates withoutinterference.

3.) Set up the proper operating levels for optimum performance as indicated under theSetup/Operating Instructions section page 10.

*U2020’s operates in the frequency range of TV channels 53 to 60. If those channels arepresent in your area, do not use those frequencies (the frequency for each channel is shownon the next page).

8 Vega U2020 UHF

U2020 System Frequency ChartThe exact frequency for each channel is shown below. When operating more than oneU2020 system at the same location, allow a spacing of at least three channels betweenoperating channels to avoid interference between systems.

Operating Frequencies for the "A" Version of U2020 [No longer actively sold]00 = 746.000 MHz 25 = 751.000 MHz 50 = 756.000 MHz 75 = 761.000 MHz01 = 746.200 26 = 751.200 51 = 756.200 76 = 761.20002 = 746.400 27 = 751.400 52 = 756.400 77 = 761.40003 = 746.600 28 = 751.600 53 = 756.600 78 = 761.60004 = 746.800 29 = 751.800 54 = 756.800 79 = 761.80005 = 747.000 30 = 752.000 55 = 757.000 80 = 762.00006 = 747.200 31 = 752.200 56 = 757.200 81 = 762.20007 = 747.400 32 = 752.400 57 = 757.400 82 = 762.40008 = 747.600 33 = 752.600 58 = 757.600 83 = 762.60009 = 747.800 34 = 752.800 59 = 757.800 84 = 762.80010 = 748.000 35 = 753.000 60 = 758.000 85 = 763.00011 = 748.200 36 = 753.200 61 = 758.200 86 = 763.20012 = 748.400 37 = 753.400 62 = 758.400 87 = 763.40013 = 748.600 38 = 753.600 63 = 758.600 88 = 763.60014 = 748.800 39 = 753.800 64 = 758.800 89 = 763.80015 = 749.000 40 = 754.000 65 = 759.000 90 = 764.00016 = 749.200 41 = 754.200 66 = 759.200 91 = 764.20017 = 749.400 42 = 754.400 67 = 759.400 92 = 764.40018 = 749.600 43 = 754.600 68 = 759.600 93 = 764.60019 = 749.800 44 = 754.800 69 = 759.800 94 = 764.80020 = 750.000 45 = 755.000 70 = 760.000 95 = 765.00021 = 750.200 46 = 755.200 71 = 760.200 96 = 765.20022 = 750.400 47 = 755.400 72 = 760.400 97 = 765.40023 = 750.600 48 = 755.600 73 = 760.600 98 = 765.60024 = 750.800 49 = 755.800 74 = 760.800 99 = 765.800

Wireless Microphone System 9

Operating Frequencies for the "B" Version of U2020 [No longer actively sold]00 = 762.200 MHz 25 = 767.200 MHz 50 = 772.200 MHz 75 = 777.200 MHz01 = 762.400 26 = 767.400 51 = 772.400 76 = 777.40002 = 762.600 27 = 767.600 52 = 772.600 77 = 777.60003 = 762.800 28 = 767.800 53 = 772.800 78 = 777.80004 = 763.000 29 = 768.000 54 = 773.000 79 = 778.00005 = 763.200 30 = 768.200 55 = 773.200 80 = 778.20006 = 763.400 31 = 768.400 56 = 773.400 81 = 778.40007 = 763.600 32 = 768.600 57 = 773.600 82 = 778.60008 = 763.800 33 = 768.800 58 = 773.800 83 = 778.80009 = 764.000 34 = 769.000 59 = 774.000 84 = 779.00010 = 764.200 35 = 769.200 60 = 774.200 85 = 779.20011 = 764.400 36 = 769.400 61 = 774.400 86 = 779.40012 = 764.600 37 = 769.600 62 = 774.600 87 = 779.60013 = 764.800 38 = 769.800 63 = 774.800 88 = 779.80014 = 765.000 39 = 770.000 64 = 775.000 89 = 780.00015 = 765.200 40 = 770.200 65 = 775.200 90 = 780.20016 = 765.400 41 = 770.400 66 = 775.400 91 = 780.40017 = 765.600 42 = 770.600 67 = 775.600 92 = 780.60018 = 765.800 43 = 770.800 68 = 775.800 93 = 780.80019 = 766.000 44 = 771.000 69 = 776.000 94 = 781.00020 = 766.200 45 = 771.200 70 = 776.200 95 = 781.20021 = 766.400 46 = 771.400 71 = 776.400 96 = 781.40022 = 766.600 47 = 771.600 72 = 776.600 97 = 781.60023 = 766.800 48 = 771.800 73 = 776.800 98 = 781.80024 = 767.000 49 = 772.000 74 = 777.000 99 = 782.000

10 Vega U2020 UHF

Operating Frequencies for the "C" Version of U202000 = 708.2 MHz 25 = 713.2 MHz 50 = 718.2 MHz 75 = 723.200 MHz01 = 708.4 26 = 713.4 51 = 718.4 76 = 723.40002 = 708.6 27 = 713.6 52 = 718.6 77 = 723.60003 = 708.8 28 = 713.8 53 = 718.8 78 = 723.80004 = 709.0 29 = 714.0 54 = 719.0 79 = 724.00005 = 709.2 30 = 714.2 55 = 719.2 80 = 724.20006 = 709.4 31 = 714.4 56 = 719.4 81 = 724.40007 = 709.6 32 = 714.6 57 = 719.6 82 = 724.60008 = 709.8 33 = 714.8 58 = 719.8 83 = 724.80009 = 710.0 34 = 715.0 59 = 720.0 84 = 725.00010 = 710.2 35 = 715.2 60 = 720.2 85 = 725.20011 = 710.4 36 = 715.4 61 = 720.4 86 = 725.40012 = 710.6 37 = 715.6 62 = 720.6 87 = 725.60013 = 710.8 38 = 715.8 63 = 720.8 88 = 725.80014 = 711.0 39 = 716.0 64 = 721.0 89 = 726.00015 = 711.2 40 = 716.2 65 = 721.2 90 = 726.20016 = 711.4 41 = 716.4 66 = 721.4 91 = 726.40017 = 711.6 42 = 716.6 67 = 721.6 92 = 726.60018 = 711.8 43 = 716.8 68 = 721.8 93 = 726.80019 = 712.0 44 = 717.0 69 = 722.0 94 = 727.00020 = 712.2 45 = 717.2 70 = 722.2 95 = 727.20021 = 712.4 46 = 717.4 71 = 722.4 96 = 727.40022 = 712.6 47 = 717.6 72 = 722.6 97 = 727.60023 = 712.8 48 = 717.8 73 = 722.8 98 = 727.80024 = 713.0 49 = 718.0 74 = 723.0 99 = 728.000

Wireless Microphone System 11

Operating Frequencies - "D" Version of U202000 = 728.200 MHz 25 = 733.20 0MHz 50 = 738.200 Mhz 75 = 743.200 MHz01 = 728.400 26 = 733.400 51 = 738.400 76 = 743.40002 = 728.600 27 = 733.600 52 = 738.600 77 = 743.60003 = 728.800 28 = 733.800 53 = 738.800 78 = 743.80004 = 729.000 29 = 734.000 54 = 739.000 79 = 744.00005 = 729.200 30 = 734.200 55 = 739.200 80 = 744.20006 = 729.400 31 = 734.400 56 = 739.400 81 = 744.40007 = 729.600 32 = 734.600 57 = 739.600 82 = 744.60008 = 729.800 33 = 734.800 58 = 739.800 83 = 744.80009 = 730.000 34 = 735.000 59 = 740.000 84 = 745.00010 = 730.200 35 = 735.200 60 = 740.200 85 = 745.20011 = 730.400 36 = 735.400 61 = 740.400 86 = 745.40012 = 730.600 37 = 735.600 62 = 740.600 87 = 745.60013 = 730.800 38 = 735.800 63 = 740.800 88 = 745.80014 = 731.000 39 = 736.000 64 = 741.000 89 = 746.00015 = 731.200 40 = 736.200 65 = 741.200 90 = 746.20016 = 731.400 41 = 736.400 66 = 741.400 91 = 746.40017 = 731.600 42 = 736.600 67 = 741.600 92 = 746.60018 = 731.800 43 = 736.800 68 = 741.800 93 = 746.80019 = 732.000 44 = 737.000 69 = 742.000 94 = 747.00020 = 732.200 45 = 737.200 70 = 742.200 95 = 747.20021 = 732.400 46 = 737.400 71 = 742.400 96 = 747.40022 = 732.600 47 = 737.600 72 = 742.600 97 = 747.60023 = 732.800 48 = 737.800 73 = 742.800 98 = 747.80024 = 733.000 49 = 738.000 74 = 743.000 99 = 748.000

12 Vega U2020 UHF

Setup and Operating Instructions1. Select a proper channel for your area as indicated in the previous section. Set both thereceiver's and the microphone's channel by adjusting their channel select switches (with asmall flat-blade screwdriver) so they’re both set to the same channel number.

2. Connect the supplied antennas. Vega recommends an upright “V” orientation (similar tothat used with the “rabbit ears” type TV antenna). For additional information regardingantennas, see the following “Antennas” section.

3. Attach the power cord to the receiver and plug into the ac power source.

4. Attach your audio cable to the rear-panel XLR audio-output connector. Connect theopposite end to your audio equipment (mixer console, recorder, etc.). The receiver output isbalanced; for single-ended (unbalanced) applications use only pins 1 (common) and 2 (L1)or use the 1/4" output. The output level in this mode will be 6 dB less than for the balancedmode. Do not connect either pin 2 (L1) or pin 3 (L2) to ground (common) at any time.Depending on local grounding conditions, the output can be normal (ground at center ofvalence), lifted (third wire is active but not grounded inside receiver) or balanced (with thirdwire open).

5. Turn on the receiver by sliding the front-panel power switch; the LEDs should illuminate.6. Insert a 9-volt battery into the transmitter and turn it on. The LED indicator should flashbriefly upon turn-on; this indicates that the battery is installed properly. If the green LEDremains on the battery is low and should be changed.

7. Observe the RF-level meter (or bargraph) on the receiver. The meter should read wellabove midscale when the transmitter is within a clear 50-foot radius of the receiver; if itdoesn’t, difficulties are indicated (refer to the “Troubleshooting” section).

8. Turn on the microphone audio. Begin speaking into the microphone. The audio should beaudible on the associated monitoring equipment.

9. “Walk” the coverage area to ensure there are no areas of poor coverage. If “dropout”occurs (little or no signal in small areas), repositioned the receiving antenna(s) to eliminatethe problem. Often, a change of just a few inches in location will completely solve theproblem. If problems occur please see the “Troubleshooting” section.

To move antennas to the front of the receiverTo move a R-2020's antenna's to its front panel: 1) remove the two screws shown below(bottom panel closest to the front of the receiver); 2) unscrew the antenna hex nuts, audiooutput nut, and two small screws from back plate; 3) gently slide the PCB out; 4) pop outthe antenna plugs in front of the receiver 5) carefull move the antenna connector to the frontplate and insert connectors threw hole; 6) screw hex nuts back on and slide PCB back in;pop plugs into antenna holes in back plate and screw audio out and small screws back intoback panel.

Wireless Microphone System 13

Receiver Antenna Selection and PlacementThe proper antenna(s) and placement is vitally important in any wireless system. Ifoverlooked when setting up a system, it can be the cause of unnecessary problems.

Antenna TypeThe “whip” antennas supplied with this receiver are adequate when covering a distance of 200 to300 feet or less, and there is a clear, line-of-sight path between the receiver and the transmitter.

If the receiver is to be in a location which does not have a clear line-of-sight path to thetransmitter, a cable may be used to place the antenna in a location other than where thereceiver is. Vega offers a magnetic-mount 1/4-wave whip antenna and a “ground-plane” 1/4-wave whip antenna, with cable, for these conditions. Two such antennas are required for theR-2020 receiver.

For operating at ranges of 500 feet (150 m) or more, Vega’s high-gain log-periodic antennaor UHF TV antennas (with an appropriate matching transformer) may be used. Suchantennas are usually narrow band and must be modified to function properly in the 746 Mhzto 782 MHz bands. Consult your Vega representative for assistance in selecting antennas forunusual applications.

14 Vega U2020 UHF

Antenna PlacementNo matter what type of antenna is used, use care in positioning and mounting. In all cases, aclear and unobstructed line-of-sight path between the receiving antenna and the transmitter isrequired.

The receiving antenna may be concealed behind fabric, thin plastic, acoustic tile, and thinplywood without significantly affecting performance. However, close proximity to metallicobjects must be avoided; objects such as lighting fixtures, scaffolding, electrical cables,metal structural members, aluminum window frames, and equipment cabinets. Whip anddipole antennas require at least a 5-inch (0.1-m) minimum spacing from metal surfaces.Other types of antennas may require greater spacing. The manufacturer’s recommendationsshould be followed when using yagis and other types of specialized antennas.

Frequently, the antenna must be located some distance from the desired location of thereceiver. In this case, long coaxial cables unavoidably reduce the available signal strengthand detract from system performance. It is not recommended to use long cables to connectantennas to UHF receivers. Consult the Vega factory when cable runs over 25 to 30 feet (8to 10m) are necessary.

TroubleshootingMost users of Vega equipment enjoy years of trouble-free operation from their wirelessmicrophones. However, as with all electronic devices, problems may be encounteredeventually. If you have trouble with Vega equipment within the first year of operation, itwill be repaired under warranty. Service for older units may also be obtained from Vega;contact the factory or your sales representative for information.

Most difficulties with Vega wireless microphones are not due to equipment failure. Vegaequipment is fully tested before leaving the factory. Usually, problems are due to equipmentapplication.

The following paragraphs describe the most common problems. If you are havingdifficulties, please review this information and take any necessary corrective action. If youstill experience difficulties, contact the Vega factory or your sales representative.

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 returnthe unit. Return of both transmitter and receiver is recommended, allowing us to perform acomplete checkout and test of the entire system. This can be especially helpful for elusive orintermittent problems.

BatteryThe most common problems with wireless microphones are are caused by weak transmitterbatteries. Vega recommends using only new Duracell MN1604 alkaline batteries in themiocrophone transmitters. Despite advertising claims, no other batteries tested by Vegaprovide equal life and equivalent reliability. Others will work, but battery life may be shortand current inadequate.

Exhausted batteries will cause many problems, including distortion, audible squeals andhowls, poor range, and off-frequency operation. Vega recommends the battery be checkedprior to each use, and that it be replaced if there is any question about its condition.

It is also good practice to replace batteries with new ones when any system problems occur,since a low battery may affect system operation in subtle ways.

Wireless Microphone System 15

Receiver NoiseVega 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 openand let through audio noise when the transmitter is off. This is usually due to harmonicoutputs of commercial radio and TV stations, spurious outputs from two-way radiotransmitters, adjacent-channel leakage from TV transmitters, and, sometimes, RF noise fromdigital equipment such as audio and video effects generators, computers, and other industrialequipment near the antennas.

When the wireless transmitter is “on,” this noise is suppressed and rarely causes anydifficulties. However, if the audio channel is left “open” with the transmitter “off,” loudblasts of noise may occur. Therefore, it is advisable to “fade” the receiver audio when thetransmitter is not in use. Changing the placement of the antennas and, in some extremecases, changing the operating frequency may be necessary to minimize these problems.

The receiver rear panel “SQUELCH” control may be adjusted to eliminate false squelchopenings when the transmitter is off. This will be effective only in mild cases ofinterference. Adjustment of this control will directly affect the system’s operating range, soconsiderable caution should be used.

Antennas/CablesIf there is a coverage problem, try moving the receiving antenna, particularly if there arenearby metallic materials. Antenna placement and mounting is vitally important. Shieldingthe antenna with metallic objects reduces the signal level available, and may result increating locations within the coverage area where the receiving antenna is almost entirelyineffective (pattern “nulls”).

Acoustic FeedbackBodypack transmitters usually use lavalier electret microphones. Almost all suchmicrophones are omnidirectional (equal sensitivity in all directions) and usually pick upmuch more ambient noise than handheld microphones.

In many sound systems, on-stage monitors are used. Often, the directional characteristics ofhandheld microphones provide the only protection from acoustic feedback. Omnidirectionallavalier microphones do not provide the same degree of protection, and acoustic feedbackmay occur when the wireless is used. However, this is an acoustic problem and is notdirectly related to the use of wireless transmission. There are several solutions to thisproblem: substituting a directional lavalier microphone (a few models are available),reducing the monitor level, relocating the monitor speakers, or careful adjustment ofequalizers.

InterferenceVega wireless-microphone systems have been specifically designed to reject interference.However, interfering signals might fall directly on the receiver frequency, making itimpossible to avoid problems completely. This can be a particular problem if the receiveraudio is left open when the transmitter is turned off.

Problems with RF noise sources (fluorescent lights, digital effects generators, and industrialequipment, etc.) are quite rare. However, defective fluorescent lighting fixtures can generateastonishing amounts of RF energy. Usually, repairing the fixture will cure the problem.Some digital audio and video signal processing equipment and effects generators also can

16 Vega U2020 UHF

generate substantial amounts of broadband noise. When this situation exists, move thereceiver antennas away from these sources of RF noise to minimize the effect of thisinterference. Fortunately, this type of problem is surprisingly rare.

A more serious problem is selection of wireless-microphone operating frequencies which areinherently subject to interference due to intermodulation. Fortunately, a proper initialselection or changing frequencies will usually correct any such problem.

Microphone ProblemsAlmost all electret microphones are sensitive to RF energy and require special precautionsto operate properly with wireless transmitters. If the sound quality of a microphone changesdrastically when its position with respect to the transmitter changes, it is likely that RFsusceptibility is the cause. Contact the Vega factory or your sales representative if assistanceis required. Lavalier mics purchased from Vega are specially assembled with addedcomponents to avoid this problem.

The wires in lavalier electret microphone cables are usually very small. After a period ofheavy use, the conductors may fray, resulting in intermittent failure or severe noise. Thewire also may break. It is advisable to have a spare microphone available in good workingcondition (it does not need to be a high-quality unit). A spare microphone enables easylocalizing of problems due to bad microphone cables by merely substituting the spare forthe suspected unit.

Wireless Microphone System 17

Warranty (Limited)All Vega wireless products are guaranteed against malfunction due to defects in materialsand workmanship for one year, beginning at the date of original purchase. If such amalfunction occurs, the product will be repaired or replaced (at our option) without chargeduring the one-year period, if delivered to the Vega factory. Warranty does not extend todamage due to improper repairs, finish or appearance items, malfunction due to abuse oroperation under other than the specified conditions, nor to incidental or consequentialdamages. Some states do not allow the exclusion or limitation of incidental or consequentialdamages, so the above limitation may not apply to you. This warranty gives the customerspecific 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 onrepairs. These service centers are fully qualified and equipped to handle the servicing ofVega equipment, and turnaround time is excellent. To obtain the address of your nearestauthorized warranty service center, contact your dealer or the factory.

If you should require service, pack the equipment carefully and return it to the factoryservice center or the nearest authorized service center. Important: Be sure the exact returnaddress and a description of the symptoms are enclosed inside the package with yourequipment. It is also advisable to return the transmitter and receiver for full systemperformance test when practical. Before returning the equipment to the factory service center,

18 Vega U2020 UHF

Claims

Wireless Microphone System 19

20 Vega U2020 UHF

U-2020 SpecificationsFrequency Band: 708-782 MHz (in four bands A, B, C, D)

Frequency Settings:100 Channels (00-99)

Audio Frequency Response: 50-15,000 Hz, +/- 1.5dB

Range:1,000 ft (200-300 ft, adverse conditions)

Audio processing:DX20 2:1 logarithmic companding

Emission/Modulation:FM, 180KF3E

Harmonic Distortion:<0.025%

Ultimate S/N:>102 dB (A-weighted)

Squelch Quieting:105 dB (A-weighted)

Audio Output

Line Level: -26 to +4 dBm

Mic Level: -56 to -26 dBm

IF Selectivity: 280 kHz

RF Selectivity: 22 MHz

Adjustment and Control: Power on/off, two 10-position frequency select, 30-dB level, 30-dBswitchable pad, squelch control

Indicators:Audio level meter (5 position), RF level meter (5 position)

Power: 5W maximum

Weight:1 LB, 14 oz (.85 kg)

Dimensions: (hwd):1.65 in (4.2cm) x 7.15 in (18.2 cm) x 9.25 in (23.5 cm)

HT-2020 Handheld Transmitter

Mic Capsules: Electro-Voice N/D267, N/D557, N/D767, and N/D967

Power Output: 50 mw

Frequency Stability: +/-0.005%

Spurious Output: -53 dB maximum

Controls: Power on/off, mute on/off, Mic level

Audio Adjustment Range: 30 dB

Antenna:Internal dipole

Battery Life: >7 hours

Length: 10.6 in (26.9 cm)

Weight (with battery): 10-oz (286.5 g)

BT-2020 Bodypack Transmitter

Power Output: 50 mw

Frequency Stability: +/-0.005%

Spurious Output: -53 dB maximum

Controls: Power on/off, mute on/off, Mic level

Connector type:4-pin Tini QG

Audio Adjustment Range:30 dB

Antenna:¼-wave flexible whip

Battery Life:>7 hours

Dimensions (hwd):4 in (10.16 cm) x 2.5 in (6.35 cm) x 1.0 in (2.54 cm)

Weight (with battery):6.1oz (173g)