Vega U2020 User manual

Vega U2020
UHF Wireless
Microphone System
V0990104 Rev. D

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. Our equipment provides superb sound quality, outstanding performance, and
the 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 the
rules for licensing, contact your Vega sales representative or the Vega factory.
This device complies with FCC Rule Part 15, and Industry Canada RSS-210 and
Operation is subject to the following two conditions: (1) this device may not cause
interference, and (2) this device must accept any interference, including interference that
may cause undesired operation of the device.
No adjustments should be made inside the transmitter or receiver for normal
operation or use. Due to the great possibility of causing improper operation, or even
damage to the transmitter, only qualified and experienced technicians should open the case.
Unauthorized adjustments or repairs inside the equipment case can void your warranty and
cause unnecessary repair costs. If you believe that internal adjustments or repairs are
needed, we recommend that you contact the factory or your nearest Vega authorized service
center.
Read This!
1.) Vega strongly recommends using Duracell batteries in the wireless mics. Other brands
yield as little as half the operating time. 2.) When setting the mic’s channel, ensure it is in
the proper orientation (see pages 6 and 7).
Unpacking
Verify 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 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.
2 Vega U2020 UHF
Contents
Quick Start ............................3
Receiver Front Panel Controls and Indicators ................4
Receiver Back Panel Controls and Indicators.................5
Handheld Mic Controls and Indicators ...................6
Bodypack Mic Controls and Indicators...................7
How to Set an Operating Channel ....................8
Setup and Operating Instructions ....................12
To Move Antennas to the Front of the Receiver ...............12
Receiver Antenna Selection and Placement .................13
Troubleshooting ..........................16
Warranty (Limited) .........................17
Service . . . . . .
........................19
Specifications ...........................20

Wireless Microphone System 3
“W alk” the are a
7
Connect receiver
2
Check RF
12345
4
Quick Start
Adjust transmitter
5
Turn on,
check frequency
3
Same processing
and frequency?
=
1
Set system
audio levels
6

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-volt
battery into compartment as shown above. Slide cover
back on.
1 + 0 = Channel 10
Remove channel switch cover from the mic. Hold mic head to
the right. Use a small screw driver to set the channel
frequency. When setting channel, mic head MUST be to
the right!
Mic: comes with either a
N/D267,N/D5557,N/D767,or N/D967 head.
Audio Mute Switch: Turns audio on
and off without turning mic power off.
Audio is on when switch is pushed
toward the windscreen.
Channel Selectors: Remove cover, use
a small screw driver to change channels
(frequencies). Selected channel must be
the same as its associated receiver’s
channel.
Power Switch: Turns battery power on
and off. Power is on when switch is
pushed toward the windscreen.
Audio Gain Control (side): A
small screwdriver may be used
to increase/decrease audio gain
(turn clockwise for higher gain).
Battery Low/Audio Peak LEDs:
When the mic is operating
properly, the LEDs remain off.
Lights when the battery becomes
low (green LED) and when audio
overload occurs (red LED).
Handheld Mic Controls and Indicators
To Insert the Battery To Set the Channel Frequency

Audio Processing Compatibility
The Vega Model R-2020 diversity receiver incorporates DX20® audio processing. It is part
of the U2020 system and will only work with Vega HT-2020 and BT-2020 transmitters.
How to Set an Operating Channel
Select an Operating Channel
If any TV stations in your area operate on channels between 53 and 60,use the channels on
indicated in the table below. If TV channels 53-60 are not used, then any U2020 channel
may 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) 30-99
61 (752-758) 0-30, 60-99
62 (758-764) 0-59, 90-99
63 (764-770) 0-89
In "B" Band use mic channels
62 (758-764) 9-99
63 (764-770) 0-8, 39-99
64 (770-776) 0-38, 69-99
65 (776-782) 0-68
In "C" Band use mic channels
53 (704-710) 10-99
54 (710-716) 00-08, 40-99,
55 (716-722) 00-38, 70-99
56 (722-728) 00-68
In "D" Band use mic channels
57 (728-734) 30-99
58 (734-740) 00-28, 60-99
59 (740-746) 00-58, 90-99
60 (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. With
antennas attached, and the receiver connected to a sound system (see next section for
details), turn on the power and listen for any interference from another source. If
interference is encountered, select another operating channel. If necessary, continue selecting
channels until a clear channel is found.
Caution: When operating more than one U2020 system at the same location, allow a
spacing of at least three channels between operating channels to avoid interference between
systems.
2.) Turn the Channel select switches on the associated HT-2020 or BT-2020 microphone, to
the same channel. Turn on the power switch, and verify that the system operates without
interference.
3.) Set up the proper operating levels for optimum performance as indicated under the
Setup/Operating Instructions section page 10.
*U2020’s operates in the frequency range of TV channels 53 to 60.If those channels are
present in your area, do not use those frequencies (the frequency for each channel is shown
on the next page).
8 Vega U2020 UHF

U2020 System Frequency Chart
The exact frequency for each channel is shown below. When operating more than one
U2020 system at the same location, allow a spacing of at least three channels between
operating 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 MHz
01 = 746.200 26 = 751.200 51 = 756.200 76 = 761.200
02 = 746.400 27 = 751.400 52 = 756.400 77 = 761.400
03 = 746.600 28 = 751.600 53 = 756.600 78 = 761.600
04 = 746.800 29 = 751.800 54 = 756.800 79 = 761.800
05 = 747.000 30 = 752.000 55 = 757.000 80 = 762.000
06 = 747.200 31 = 752.200 56 = 757.200 81 = 762.200
07 = 747.400 32 = 752.400 57 = 757.400 82 = 762.400
08 = 747.600 33 = 752.600 58 = 757.600 83 = 762.600
09 = 747.800 34 = 752.800 59 = 757.800 84 = 762.800
10 = 748.000 35 = 753.000 60 = 758.000 85 = 763.000
11 = 748.200 36 = 753.200 61 = 758.200 86 = 763.200
12 = 748.400 37 = 753.400 62 = 758.400 87 = 763.400
13 = 748.600 38 = 753.600 63 = 758.600 88 = 763.600
14 = 748.800 39 = 753.800 64 = 758.800 89 = 763.800
15 = 749.000 40 = 754.000 65 = 759.000 90 = 764.000
16 = 749.200 41 = 754.200 66 = 759.200 91 = 764.200
17 = 749.400 42 = 754.400 67 = 759.400 92 = 764.400
18 = 749.600 43 = 754.600 68 = 759.600 93 = 764.600
19 = 749.800 44 = 754.800 69 = 759.800 94 = 764.800
20 = 750.000 45 = 755.000 70 = 760.000 95 = 765.000
21 = 750.200 46 = 755.200 71 = 760.200 96 = 765.200
22 = 750.400 47 = 755.400 72 = 760.400 97 = 765.400
23 = 750.600 48 = 755.600 73 = 760.600 98 = 765.600
24 = 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 MHz
01 = 762.400 26 = 767.400 51 = 772.400 76 = 777.400
02 = 762.600 27 = 767.600 52 = 772.600 77 = 777.600
03 = 762.800 28 = 767.800 53 = 772.800 78 = 777.800
04 = 763.000 29 = 768.000 54 = 773.000 79 = 778.000
05 = 763.200 30 = 768.200 55 = 773.200 80 = 778.200
06 = 763.400 31 = 768.400 56 = 773.400 81 = 778.400
07 = 763.600 32 = 768.600 57 = 773.600 82 = 778.600
08 = 763.800 33 = 768.800 58 = 773.800 83 = 778.800
09 = 764.000 34 = 769.000 59 = 774.000 84 = 779.000
10 = 764.200 35 = 769.200 60 = 774.200 85 = 779.200
11 = 764.400 36 = 769.400 61 = 774.400 86 = 779.400
12 = 764.600 37 = 769.600 62 = 774.600 87 = 779.600
13 = 764.800 38 = 769.800 63 = 774.800 88 = 779.800
14 = 765.000 39 = 770.000 64 = 775.000 89 = 780.000
15 = 765.200 40 = 770.200 65 = 775.200 90 = 780.200
16 = 765.400 41 = 770.400 66 = 775.400 91 = 780.400
17 = 765.600 42 = 770.600 67 = 775.600 92 = 780.600
18 = 765.800 43 = 770.800 68 = 775.800 93 = 780.800
19 = 766.000 44 = 771.000 69 = 776.000 94 = 781.000
20 = 766.200 45 = 771.200 70 = 776.200 95 = 781.200
21 = 766.400 46 = 771.400 71 = 776.400 96 = 781.400
22 = 766.600 47 = 771.600 72 = 776.600 97 = 781.600
23 = 766.800 48 = 771.800 73 = 776.800 98 = 781.800
24 = 767.000 49 = 772.000 74 = 777.000 99 = 782.000
10 Vega U2020 UHF

Operating Frequencies for the "C" Version of U2020
00 = 708.2 MHz 25 = 713.2 MHz 50 = 718.2 MHz 75 = 723.200 MHz
01 = 708.4 26 = 713.4 51 = 718.4 76 = 723.400
02 = 708.6 27 = 713.6 52 = 718.6 77 = 723.600
03 = 708.8 28 = 713.8 53 = 718.8 78 = 723.800
04 = 709.0 29 = 714.0 54 = 719.0 79 = 724.000
05 = 709.2 30 = 714.2 55 = 719.2 80 = 724.200
06 = 709.4 31 = 714.4 56 = 719.4 81 = 724.400
07 = 709.6 32 = 714.6 57 = 719.6 82 = 724.600
08 = 709.8 33 = 714.8 58 = 719.8 83 = 724.800
09 = 710.0 34 = 715.0 59 = 720.0 84 = 725.000
10 = 710.2 35 = 715.2 60 = 720.2 85 = 725.200
11 = 710.4 36 = 715.4 61 = 720.4 86 = 725.400
12 = 710.6 37 = 715.6 62 = 720.6 87 = 725.600
13 = 710.8 38 = 715.8 63 = 720.8 88 = 725.800
14 = 711.0 39 = 716.0 64 = 721.0 89 = 726.000
15 = 711.2 40 = 716.2 65 = 721.2 90 = 726.200
16 = 711.4 41 = 716.4 66 = 721.4 91 = 726.400
17 = 711.6 42 = 716.6 67 = 721.6 92 = 726.600
18 = 711.8 43 = 716.8 68 = 721.8 93 = 726.800
19 = 712.0 44 = 717.0 69 = 722.0 94 = 727.000
20 = 712.2 45 = 717.2 70 = 722.2 95 = 727.200
21 = 712.4 46 = 717.4 71 = 722.4 96 = 727.400
22 = 712.6 47 = 717.6 72 = 722.6 97 = 727.600
23 = 712.8 48 = 717.8 73 = 722.8 98 = 727.800
24 = 713.0 49 = 718.0 74 = 723.0 99 = 728.000
Wireless Microphone System 11

Operating Frequencies - "D" Version of U2020
00 = 728.200 MHz 25 = 733.20 0MHz 50 = 738.200 Mhz 75 = 743.200 MHz
01 = 728.400 26 = 733.400 51 = 738.400 76 = 743.400
02 = 728.600 27 = 733.600 52 = 738.600 77 = 743.600
03 = 728.800 28 = 733.800 53 = 738.800 78 = 743.800
04 = 729.000 29 = 734.000 54 = 739.000 79 = 744.000
05 = 729.200 30 = 734.200 55 = 739.200 80 = 744.200
06 = 729.400 31 = 734.400 56 = 739.400 81 = 744.400
07 = 729.600 32 = 734.600 57 = 739.600 82 = 744.600
08 = 729.800 33 = 734.800 58 = 739.800 83 = 744.800
09 = 730.000 34 = 735.000 59 = 740.000 84 = 745.000
10 = 730.200 35 = 735.200 60 = 740.200 85 = 745.200
11 = 730.400 36 = 735.400 61 = 740.400 86 = 745.400
12 = 730.600 37 = 735.600 62 = 740.600 87 = 745.600
13 = 730.800 38 = 735.800 63 = 740.800 88 = 745.800
14 = 731.000 39 = 736.000 64 = 741.000 89 = 746.000
15 = 731.200 40 = 736.200 65 = 741.200 90 = 746.200
16 = 731.400 41 = 736.400 66 = 741.400 91 = 746.400
17 = 731.600 42 = 736.600 67 = 741.600 92 = 746.600
18 = 731.800 43 = 736.800 68 = 741.800 93 = 746.800
19 = 732.000 44 = 737.000 69 = 742.000 94 = 747.000
20 = 732.200 45 = 737.200 70 = 742.200 95 = 747.200
21 = 732.400 46 = 737.400 71 = 742.400 96 = 747.400
22 = 732.600 47 = 737.600 72 = 742.600 97 = 747.600
23 = 732.800 48 = 737.800 73 = 742.800 98 = 747.800
24 = 733.000 49 = 738.000 74 = 743.000 99 = 748.000
12 Vega U2020 UHF

Setup and Operating Instructions
1. Select a proper channel for your area as indicated in the previous section. Set both the
receiver's and the microphone's channel by adjusting their channel select switches (with a
small 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 to
that used with the “rabbit ears” type TV antenna). For additional information regarding
antennas, 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 the
opposite end to your audio equipment (mixer console, recorder, etc.). The receiver output is
balanced; 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 balanced
mode. 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 of
valence), lifted (third wire is active but not grounded inside receiver) or balanced (with third
wire 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 flash
briefly upon turn-on; this indicates that the battery is installed properly. If the green LED
remains on the battery is low and should be changed.
7. Observe the RF-level meter (or bargraph) on the receiver. The meter should read well
above midscale when the transmitter is within a clear 50-foot radius of the receiver; if it
doesn’t, difficulties are indicated (refer to the “Troubleshooting” section).
8. Turn on the microphone audio. Begin speaking into the microphone. The audio should be
audible 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 eliminate
the problem. Often, a change of just a few inches in location will completely solve the
problem. If problems occur please see the “Troubleshooting” section.
To move antennas to the front of the receiver
To 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, audio
output nut, and two small screws from back plate; 3) gently slide the PCB out; 4) pop out
the antenna plugs in front of the receiver 5) carefull move the antenna connector to the front
plate 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 into
back panel.
Wireless Microphone System 13

Receiver Antenna Selection and Placement
The proper antenna(s) and placement is vitally important in any wireless system. If
overlooked when setting up a system, it can be the cause of unnecessary problems.
Antenna Type
The “whip” antennas supplied with this receiver are adequate when covering a distance of 200 to
300 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 the
transmitter, a cable may be used to place the antenna in a location other than where the
receiver 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 the
R-2020 receiver.
For operating at ranges of 500 feet (150 m) or more, Vega’s high-gain log-periodic antenna
or UHF TV antennas (with an appropriate matching transformer) may be used. Such
antennas are usually narrow band and must be modified to function properly in the 746 Mhz
to 782 MHz bands. Consult your Vega representative for assistance in selecting antennas for
unusual applications.
14 Vega U2020 UHF

Antenna Placement
No matter what type of antenna is used, use care 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 must be avoided; objects such as lighting fixtures, scaffolding, electrical cables,
metal structural members, aluminum window frames, and equipment cabinets. Whip and
dipole 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 recommendations
should be followed when using yagis and other types of specialized antennas.
Frequently, the antenna must be located some distance from the desired location of the
receiver. In this case, long coaxial cables unavoidably reduce the available signal strength
and detract from system performance. It is not recommended to use long cables to connect
antennas to UHF receivers. Consult the Vega factory when cable runs over 25 to 30 feet (8
to 10m) are necessary.
Troubleshooting
Most users of Vega equipment enjoy years of trouble-free operation from their wireless
microphones. However, as with all electronic devices, problems may be encountered
eventually. If you have trouble with Vega equipment within the first year of operation, it
will 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. Vega
equipment is fully tested before leaving the factory. Usually, problems are due to equipment
application.
The following paragraphs describe the most common problems. If you are having
difficulties, please review this information and take any necessary corrective action. If you
still 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 return
the unit. Return of both transmitter and receiver is recommended, allowing us to perform a
complete checkout and test of the entire system. This can be especially helpful for elusive or
intermittent problems.
BatteryThe most common problems with wireless microphones are are caused by weak transmitter
batteries. Vega recommends using only new Duracell MN1604 alkaline batteries in the
miocrophone transmitters. Despite advertising claims, no other batteries tested by Vega
provide equal life and equivalent reliability. Others will work, but battery life may be short
and current inadequate.
Exhausted batteries will cause many problems, including distortion, audible squeals and
howls, poor range, and off-frequency operation. Vega recommends 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 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 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 harmonic
outputs of commercial radio and TV stations, spurious outputs from two-way radio
transmitters, adjacent-channel leakage from TV transmitters, and, sometimes, RF noise from
digital equipment such as audio and video effects generators, computers, and other industrial
equipment near the antennas.
When the wireless 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 may occur. Therefore, 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 may be necessary to minimize these problems.
The receiver rear panel “SQUELCH” control may be adjusted to eliminate false squelch
openings when the transmitter is off. This will be effective only in mild cases of
interference. Adjustment of this control will directly affect the system’s operating range, so
considerable caution should be used.
Antennas/Cables
If there is a coverage problem, try moving the receiving antenna, particularly if there are
nearby metallic materials. Antenna placement and mounting is vitally important. Shielding
the antenna with metallic objects reduces the signal level available, and may result in
creating locations within the coverage area where the receiving antenna is almost entirely
ineffective (pattern “nulls”).
Acoustic Feedback
Bodypack transmitters usually use lavalier electret microphones. Almost all such
microphones are omnidirectional (equal sensitivity in all directions) and usually pick up
much more ambient noise than handheld microphones.
In many sound systems, on-stage monitors are used. Often, the directional characteristics of
handheld microphones provide the only protection from acoustic feedback. Omnidirectional
lavalier microphones do not provide the same degree of protection, and acoustic feedback
may occur when the wireless is used. However, this is an acoustic problem and is not
directly related to the use of wireless transmission. There are several solutions to this
problem: substituting a directional lavalier microphone (a few models are available),
reducing the monitor level, relocating the monitor speakers, or careful adjustment of
equalizers.
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. 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, and 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.
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 the
receiver antennas 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 usually correct any such problem.
Microphone Problems
Almost all electret microphones are sensitive to RF energy and require special precautions
to operate properly with wireless transmitters. If the sound quality of a microphone changes
drastically when its position with respect to the transmitter changes, it is likely that RF
susceptibility is the cause. Contact the Vega factory or your sales representative if assistance
is required. Lavalier mics purchased from Vega are specially assembled with added
components to avoid this problem.
The wires in lavalier electret microphone cables are usually very small. After a period of
heavy use, the conductors may fray, resulting in intermittent failure or severe noise. The
wire also may break. It is advisable to have a spare microphone available in good working
condition (it does not need to be a high-quality unit). A spare microphone enables easy
localizing of problems due to bad microphone cables by merely substituting the spare for
the suspected unit.
Wireless Microphone System 17

Warranty (Limited)
All Vega 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 repairs, 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. Important: Be sure the exact return
address and a description of the symptoms are enclosed inside the package with your
equipment. It is also advisable to return the transmitter and receiver for full system
performance 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 Specifications
Frequency 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-dB
switchable 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)