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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

Summary of Contents for U2020

Page 1: ...Vega U2020 UHF Wireless Microphone System V0990104 Rev D ...

Page 2: ...nt 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 ...

Page 3: ...Wireless Microphone System 3 Walk the area 7 Connect receiver 2 Check RF 1 2 3 4 5 4 Quick Start Adjust transmitter 5 Turn on check frequency 3 Same processing and frequency 1 Set system audio levels 6 ...

Page 4: ...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 Diver...

Page 5: ...elch 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 t...

Page 6: ...witch 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 f...

Page 7: ......

Page 8: ... 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 necessar...

Page 9: ...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 ...

Page 10: ... 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...

Page 11: ...5 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 ...

Page 12: ...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 7...

Page 13: ...mitter 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 ind...

Page 14: ...f 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 ant...

Page 15: ...btained 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 ta...

Page 16: ...duces 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 micropho...

Page 17: ...ters 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 ...

Page 18: ...anty 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...

Page 19: ...Claims Wireless Microphone System 19 ...

Page 20: ...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 Interna...

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