Vega R-27 Instruction Manual

Model R-27

Wireless-Microphone Receiver

Instruction Manual

099-0050A

2 R-27 Portable

Table of contents

A Word to Vega Users
When You Receive Your Vega Equipment
Introduction
Compatibility
Controls, Connectors, and Indicators
Operating Instructions
Antennas
Writing Connectors and Plugs
Troubleshooting
Warranty (Limited)
Repair
Claims

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A Word to Vega Users

In selecting Vega wireless microphones, you are in the company of audio professionals
worldwide. You can be confident that the equipment is the finest of its type.

Vega's leadership for well over 30 years has made the name “Vega” synonymous with
wireless microphones. Vega equipment provides superb sound quality, outstanding
radio-frequency performance, and the reliability and durability needed to ensure you of
years of successful operation.

Vega wireless-microphone systems provide sound quality essentially equal to wired
microphones without unsightly and annoying cables. Our many years of experience in
the design and manufacture of wireless microphones, our advanced circuit-design
techniques, our attention to product quality, and our dedication to professional
performance are your assurance of continuing satisfaction for years to come.

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When You Receive Your Vega Equipment

Upon receiving your shipment, verify that the number of boxes shown as shipped on
the freight receipt has been received. Also check immediately for damage to boxes
which may have occurred during shipment. Notify both the dealer and the freight carrier
if damages or losses are found, so that claims may be expedited. Unpack the unit or
units carefully. We recommend saving the shipping cartons; they are very useful for
reshipping the equipment at a future date.

If, for any reason, you do not find the equipment received to be completely satisfactory,
please immediately contact your Vega dealer or the Vega factory. In spite of our
rigorous quality-control procedures, mistakes and shipment errors occasionally occur. If
you should experience a problem, Vega will promptly correct the discrepancy.

Should service ever be required, remember that your authorized Vega service center
knows your equipment best and has 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.

Thank you for selecting Vega products. We assure you of our continuing interest in
your satisfaction.

Wireless-Microphone Receiver 3
Introduction

Vega wireless microphone systems are easy to use. However, if you are setting up a
wireless microphone for the first time, we urge you to read carefully the manuals
furnished with each piece of equipment, and to consult the manual from time to time as
you become more familiar with your equipment.

This manual has been prepared to acquaint you with the operation and care of your
Vega R-27 wireless-microphone receiver. We urge you to read it carefully and to follow
the recommendations. This will help to assure that you realize the full performance
potential of the equipment and achieve years of reliable, highly satisfactory operation.

Compatibility

The Vega Model R-27 PRO portable receiver works with Vega's PRO Series bodypack
transmitters (such as the Model T-25) and handheld transmitters (such as the T-29). The
receiver is available only with DYNEX®III audio-processing circuitry. Therefore, it is
not compatible with with non-DYNEX®III transmitters. If you are not certain that the
receiver and transmitter are compatible, contact the Vega factory or your Vega sales
representative.

The R-27 PRO receiver is designed to work in the 169 to 216 MHz VHF range, and
must be precisely matched to the frequency of the associated transmitter. The receiver's
frequency is marked on its case. The transmitter's frequency is marked on the data label
on its side or in its battery compartment. If the transmitter and receiver frequencies are
not precisely the same, the frequency of one of the units must be changed. It is usually
easier to change the frequency of the receiver; however, it is 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 frequency­coordination service for purchasers of its equipment. Frequencies are selected by
computer to avoid any possible interference from other wireless systems and broadcast
stations. To take advantage of this free service, contact the Vega factory or your local
sales representative.

Controls, Connectors, and Indicators

LED Displays: The four LEDs on the front panel indicate the following: receiver
squelch condition (TX); low-level audio (–30); audio overload (–4); and acceptable
battery power (PWR).

The TX indicator turns on whenever a transmitter is producing enough power, at the
same frequency, to operate the receiver. When the TX LED is off, the receiver audio is
squelched (shut down).

The audio metering circuitry is a simple two-LED display. Provided the AUDIO
LEVEL adjustment is set to maximum, the –4 and –30 LEDs correspond to the same
approximate microphone dBu output level. The Audio Level control adjustment does
not affect the display, because metering is done prior to the output stage. With normal
speech the –30 indicator should be flashing on and off with the audio. The –4 LED is
an overload indicator and should not flash except with extremely large audio bursts.
The activation of this overload indicator means that the transmitter is reaching soft
compression. However, the gain-compression circuitry in the transmitter doesn't respond

4 R-27 Portable

instantaneously to short-duration “spikes” and other transient peaks in voice energy.
These peaks can cause the instantaneous peak deviation of the transmitter to reach
values of about 3 dB above the normal steady-state maximum. The R-27 will
accommodate these brief transients without distortion due to its ability to provide in
excess of +6 dBm of output without clipping.

The battery-power indicator stays on, provided that battery life is good. As soon as the
battery voltage drops to an unacceptable level, the PWR LED turns off. When this
occurs, the battery has less than an hour of life remaining.

Power Switch (PWR): On/off switch for the receiver. The current drain is 45 mA with
the headphone monitor control switch set to “off”. In the “on” position the current
increases by about 10%. The current can increase even further, depending on the load
presented to the monitor jack and the audio level of the receiver.

Monitor Level Adjust (MON): The only adjustment on the front panel; it is used to
adjust the audio level to the monitor stereo jack. This control incorporates a monitor
on/off switch which can turn off the audio to the jack by turning the control fully
counter-clockwise until a click is felt. In this position, the power drain to the battery is
reduced.

Audio Level Adjust: Located on the rear panel, it adjusts the audio output of the
receiver. This control has approximately 46 dB of operating range and has an audio
taper.

Connectors

Antenna (ANT): Front-panel BNC connector for use with the antenna supplied.

XLR Audio Output: Rear-panel-mounted, full-sized, three-pin, male, XLR connector
which provides mic-level balanced audio output from the receiver.

Monitor Jack (MON): Front-panel, miniature, stereo, female headphone connector
which supplies audio for low-impedance headsets such as the type used on miniature
inexpensive portable receivers.

Operating Instructions

(1) Install a 9-volt alkaline battery in the R-27 receiver by sliding the battery door open
on the rear panel. Be sure to observe the polarity marking inside of the battery
compartment near the compartment door. The receiver is reverse-polarity protected and
cannot be damaged by incorrect battery insertion, but the unit may fail to operate and
the battery life greatly shortened if the battery is not correctly installed. If the battery is
not correctly installed, the battery-compartment door will not close properly. Do not
attempt to force the door closed; instead, check and correct the battery polarity.

(2) Connect the receiver antenna (“rubber duckie” supplied). A right-angle adapter is
provided for use with the “rubber duckie”, should one be needed.

A vertical orientation is recommended; however, there will be no great difference in
performance if horizontal mounting is necessary. In either case, the antenna should be
positioned away from the chassis of the receiver (or other metallic objects such as
cameras, sound carts, etc.).