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.).
Wireless-Microphone Receiver 5
(3) Plug your audio cable into the rear-panel audio-output connector of the R-27
receiver and connect the opposite end to your audio equipment (camera mic input,
mixer console, recorder, etc.). The audio output connector is a standard full-size XLR;
see below for wiring information.
Note: The receiver output is balanced; for single-ended (unbalanced) applications,
connect the audio shield to Pin #1 and the center conductor to Pin #2. Do not connect
Pin #3; doing so will cause distorted audio. Output will be 6 dB less for the singleended output mode than for the balanced mode.
(4) Turn “on” the receiver by setting the front-panel power switch to “ON”. The PWR
(rightmost) LED should illuminate. If not, the battery may be weak or dead.
(5) Verify that the transmitter has a fresh battery installed and that the microphone is
connected correctly. Turn “on” the transmitter.
(6) Place the transmitter in a pocket or attach to clothing or body with the belt clip
supplied, or with tape. Keep the antenna as high and vertical as possible.
NOTE: Attaching a rubber band to the end of the antenna and pinning the rubber band
to clothing with a safety pin is an excellent way of keeping the antenna oriented
properly while giving the user freedom to move without causing strain on the antenna.
(7) Turn the transmitter “on”, and position it in the approximate center of the area to be
covered by the wireless system. The R-27 receiver TX LED should illuminate; if not,
then difficulties are indicated (e.g., defective transmitter, receiver, or antenna, excessive
operating range, or severe RF propagation problems). Refer to section “In Case of
Difficulty”.
(8) Verify that the transmitter “MIC” switch is “on”. The audio levels should now be
set for the system. With the microphone correctly positioned, speak loudly into it. If
necessary, turn the audio gain on the transmitter up or down. Also, if necessary, adjust
the receiver “LVL” control.
(9) Readjust the transmitter mic level control, if necessary. When speaking loudly, the
“MIC OVERLOAD” indicator (if one is present) on the transmitter control panel should
flash on the loudest voice peaks. This indicates that the transmitter is at approximately
the point where soft gain compression is occurring in the microphone preamplifier. If
the system is correctly set up, the compression point will be reached only rarely. Setting
the mic level correctly maximizes the system signal-to-noise ratio while ensuring
optimum audio quality. If the mic level is set too high, thumps or pops due to overload
may occur; if set too low, the system may “noise-up” at times.
(10) Audio phasing, if important, should also be checked at this time. Because of
differences in lavalier microphones, it is not possible to be sure that two different types
of microphones have the same phase. If the console or recorder does not have a phasing
switch, it may be necessary to reverse the wiring in the audio cable from the receiver.
(11) 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 or receiver, 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.
6 R-27 Portable
(12) It is always advisable to “walk” the coverage area to ensure that there are no areas
of poor coverage. Signal “dropouts” (little or no signal in small areas) are indicated by
the “TX” LED going out or by a brief “fizzing” sound in the audio (which may or may
not be followed by a silent period due to squelched audio). The audio may be
conveniently monitored with a set of headphones plugged into the stereo phone jack on
the receiver. If a “dropout” area occurs, the antenna can usually be repositioned to
eliminate the problem. Frequently, a change of just a few inches in location will solve
the problem completely.
Antennas
The receiver antenna may be the most important single component in a wirelessmicrophone system. However, this is the item most often overlooked in setting up a
system, and is frequently the cause of quite unnecessary problems. Proper selection and
placement of the receiving antenna is vitally important in any wireless-microphone
system.
Antennas are a particular issue with miniaturized wireless-microphone equipment such
as the R-27 receiver, in that antenna size tends to seem disproportionately large in
comparison to the equipment itself. This is easy to understand, in that the length of the
antenna is several times the maximum dimension of the receiver. However, while
electronic circuitry can be miniaturized without significant performance compromises,
the same is not true of antennas. That is, while components can be made almost
arbitrarily smaller, physical constants (such as wavelength) cannot. The net effect is
that, while antennas whose dimensions are far less than a wavelength do exist, they are
seriously less efficient than larger antennas. About the smallest antenna with reasonable
efficiency is the 1/4-wavelength design, which must be about 16.5 inches (42 cm) long
at 180 MHz.
Of course, electrically small antennas (such as the “rubber duckie”) are widely
available. These units are normally 7 to 14 inches (19 to 35 cm) long, much shorter
than 1/4 wavelength. However, such designs merely make the best of a bad situation by
providing a good impedance match at the tuned frequency. This at least avoids adding
matching loss to an already low efficiency. In general, even the best such designs are 3
to 6 dB less efficient than a simple 1/4-wave whip. In practical terms, the working
range of a system using this type of antenna will be only 50 to 70% of that of the same
system using a good-quality 1/4-wave whip (available as an option from your Vega
dealer).
The antenna should not be positioned near metallic objects, and especially not parallel
to them. The best arrangement is orienting the antenna vertically and at right angles
with nearby metallic objects. A location relatively high with respect to the person using
the transmitter is also desirable; about 8 or 9 feet (2.5 m) above the floor is usually
best.
A coaxial adapter is provided to convert the “rubber duckie” for right-angle use if this
is necessary. The “rubber duckie” is often used for body-worn applications (with the
receiver slung over the shoulder or on a belt, for example). In this case, efficiency will
be even lower due to absorption of the RF energy by the body. An additional loss of 5
to 10 dB is likely, reducing range by another factor of two or three. If range is a
problem (as evidenced by severe dropouts), using the supplied rubberized whip antenna,
or an optional 1/4-wave whip antenna (Vega Model 121BNC standard or Model 221
two-piece, which screws together), or a limp-wire antenna (Vega Model 224) may be
necessary.
Wireless-Microphone Receiver 7
In these situations, the optional limp-wire antenna will perform best. The overall
efficiency of the limp-wire antenna is about the same as for the wire whip. When the
receiver is worn on the belt, body absorption will still reduce the range significantly,
but this loss will not be added to that of an already inefficient antenna. The limp-wire
antenna also has the advantage of being comfortable to wear, since it is highly flexible
and conforms easily to the body.
While the standard or optional antennas available for use with the R-27 should cover
the majority of applications, other types of antennas may be needed for unusual
applications, such as operating at extreme ranges of 1000 feet (300 m) or more. TV
antennas (with an appropriate matching transformer) are often used for this purpose. A
“high-band” wide-bandwidth yagi antenna (Winegard AK5713, or similar) works well
in this application. VHF 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 174 to 216 MHz range. Contact the Vega factory
or your sales representative for assistance in selecting antennas for unusual applications.
Wiring Connectors and Plugs
Preparing high-quality cables, with connectors properly installed, is the key to reliable
and trouble-free operation of any sound system. A few moments of extra care here can
save hours of troubleshooting later on.
As a rule, the amount of insulation removed and the length of exposed cable should be
minimized. This reduces the likelihood of short circuits and improves the ability of the
clamp to grip the cable firmly. Just enough heat should be used to obtain a free flow of
solder, but to allow leads to cool quickly after solder flows to avoid melting insulation.
After each connector has been completely wired, the cable should be tested with an
ohmmeter or a cable tester. Continuity between the various conductors and their
associated connector pins must be established, and there should be infinite resistance
(an open circuit) between all connector pins. In most cases, especially in portable
installations, XLR connectors should not conduct at all between the shell and pin 1.
This avoids grounding problems from inadvertent touching of the shell to other devices.
The XLR connector provides front-panel balanced mic-level audio outputs. The pin
connections for this connector are as follows:
Pin #1......Shield (common to receiver ground)
Pin #2......Balanced audio out (“high”)
Pin #3......Balanced audio out (“low”)
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 experience difficulty with your Vega wireless-microphone system
within the first year of operation, it will be repaired under warranty (see below). Service
for older units may also be obtained from Vega; contact the factory or your sales
representative for information.
The majority of difficulties with Vega wireless microphones are not due to equipment
failure. This equipment is fully tested before leaving the factory and is inherently
reliable. In most instances, problems are due to equipment application.
8 R-27 Portable
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.
Battery
The most common problems with wireless-microphone systems are those related to the
batteries. Vega recommends that only new, fresh Duracell MN1604 or “Eveready”
Energizer No. 522 alkaline batteries be used. No other batteries tested by Vega have
been found to provide equal life and equivalent reliability. Unfortunately, batteries
purchased in drug stores and supermarkets may not be fresh and frequently do not yield
rated life (6 to 8 hours is the usual range). Regular “9-volt” carbon cells have much
shorter lifetimes (two to three hours for a fresh unit, perhaps less than one hour for a
unit which has been on a rack for a year or so). Cheap “bargain” cells may not work at
all, because they often are really 7 volts instead of 9 volts, and may not be able to
supply the required current.
Rechargeable cells (“ni-cads”) are sometimes used in wireless equipment. The units
commonly sold are almost always 7.2 volts instead of 9 volts and provide only a few
minutes of operation. The only acceptable rechargeable battery known to Vega is the
Varta, which is a true 9-volt design. Even here, the usable life will be much less than
for a Duracell (usually two to three hours).
Battery contacts must be clean and unbroken. The battery tension spring in the
transmitter (opposite to the battery contacts) must also be intact. Attempted forced
reverse insertion of a battery is practically impossible, but the attempt will often
damage the battery contacts. Some “9-volt” batteries sold are larger (or smaller) than
standard and may either fail to work or may damage the contacts when inserted.
Damage to the contacts usually requires a return to the factory or authorized service
center.
Exhausted batteries will cause numerous problems, including distortion, audible squeals
and howls, poor range, and off-frequency operation. It is strongly recommended that 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 try replacing the battery with a fresh unit
in the event of any sort of problem with the system, because a low battery may affect
system operation in subtle ways.
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 the presence of weak carriers on the receiver frequency due to second-harmonic
output of FM radio stations, spurious outputs from two-way radio transmitters, adjacentchannel leakage from TV transmitters, and, in some cases, RF noise from industrial
equipment. 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. For this reason, it is advisable to “fade” the
receiver audio when the transmitter is not in use.
Acoustic Feedback
Bodypack transmitters usually use lavalier electret microphones. Almost all such
microphones are omnidirectional (equal sensitivity in all directions) and usually pick up
more ambient noise than the handheld microphones to which performers are
accustomed. The characteristic “sound” of lavalier microphones is also quite different
from the usual dynamic handheld microphone, partially because they are electrets and
usually sound “brighter” than dynamics. In many sound systems, on-stage monitors are
Wireless-Microphone Receiver 9
used. Oftentimes, 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 system is used. However, this is an acoustic problem and is not directly related
to the use of wireless transmission. Solutions to this problem include substituting a
directional lavalier microphone (a few such units are available), reducing the monitor
level, or relocating the monitor speakers.
Antennas/Cables
As noted in the section on antennas above, selection, placement, and mounting are
vitally important. Shielding of the antenna with metallic objects not only will reduce the
signal level available, but may result in creating locations within the coverage area
where the receiving antenna is almost entirely ineffective (pattern “nulls”). If a
coverage problem exists, it is always advisable to try moving the receiving antenna,
particularly if there are nearby metallic materials.
Interference
Vega wireless microphone systems have been specifically designed to reject
interference. However, interfering signals may 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, car ignitions, 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,
because normally functioning fixtures almost never cause trouble. This situation is true
for most other interference sources as well. That is, unless the equipment is electrically
defective, the interference will not adversely affect Vega wireless equipment. When
such a situation exists, the source has become a wideband transmitter and nothing can
be done to the wireless equipment to correct the problem that will not seriously degrade
performance. Fortunately, this type of problem is very rare.
A more serious problem is selecting wireless-microphone operating frequencies which
are inherently subject to interference due to intermodulation. Fortunately, a proper
initial selection of or changing frequencies will almost always correct any such
problem. Vega offers a free computerized frequency-selection service to purchasers of
its equipment. If the frequency of other wireless equipment to be used in a given area is
known, interference-free frequencies can be chosen. However, if equipment is added
later without frequency coordination, an interference problem will likely exist. Should
this occur, contact the Vega factory or your sales representative for assistance. Contrary
to popular belief, a dozen or more wireless systems may be used in an area, with
careful frequency coordination.
Microphone Problems
A few electret microphones are sensitive to RF energy and require special precautions
to operate properly with wireless transmitters. This includes several types of Sony
microphones, some Beyer and AKG units, most types of Audio-Technica microphones,
and several others. If the sound quality of a microphone changes drastically when its
position with respect to the transmitter changes, RF susceptibility is likely the cause.
Contact the Vega factory or your sales representative if assistance is required.
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.
Of course, an outright break may also occur, but this is usually easy to identify and
correct. It is advisable to have a spare microphone available which is known to be in
good working condition (it does not need to be a high-quality unit). With a spare
microphone, it becomes easy to localize problems due to bad microphone cables by
merely substituting the spare for the suspected unit.
10 R-27 Portable
General
It is almost always advisable to contact the Vega factory or your sales representative
prior to returning equipment for repair. Oftentimes, the problem can be resolved by
telephone, avoiding downtime for unnecessary returns. However, should repairs be
necessary, Vega will promptly correct the problem and return the unit. Return of both
the transmitter and receiver is recommended, allowing Vega to perform a complete
checkout and test of the entire system. This can be especially helpful for elusive or
intermittent problems.
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, or
malfunction due to abuse or operation under other than the specified conditions, nor
does it extend 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 both the transmitter and receiver for a full system
performance test when practical.
Repair
Vega
9900 Baldwin Place
El Monte, CA 91731-2204
(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 liability shall be expressly limited to
replacement or repair of defective materials.
R-27 Specifications
Frequency Ranges: 169-216 MHz
Frequency Stability: ±0.005%
RF Input Impedance: 50 Ω
Sensitivity: Better than 1.3 µV for 50 dB S/N (20-kHz bandwidth)
Ultimate Quieting (S/N): 100 dB (referenced to 15 kHz deviation)
Squelch Quieting: 101 dB (referenced to 15 kHz deviation)
Harmonic Distortion: 0.4% maximum; 0.2% typical at 1 kHz
Deviation Acceptance: ±15 kHz
Image and Spurious Rejection: 75 dB, minimum (typically 80 to 85 dB)
Audio Output Impedance: Mic level, 150 Ω, nominal
Audio Output (Adjustable): Mic level: +1 dBm to –45 dBm (at full deviation), +5 dBm minimum at clipping.
Power Requirements: 9 V battery, 7-10 V
Internal Supply: One 9-V battery (heavy-duty alkaline) for 6-8 hours* continuous operation, enclosed in receiver case and
accessible via rear panel without opening electronic section
*Will be affected by position of monitor volume adjustment.
Dimensions: 3.4 in (8.6 cm) wide x 1.2 in (3.0 cm) high x 5.7 in (14.5 cm) deep
Weight: Less than 14 ounces (0.40 kg), including battery
Controls: Headphone monitor, mic level adjustment, power switch (ON/OFF)
Connectors: XLR (3-pin male) audio program output; BNC coaxial antenna jack; miniature stereo phone jack (3.5 mm)
Indicators: 4 LED; TX “on”, –30 dBm, –4 dBm (audio level), and power on
Operating Temperature Range: –20°C to +55°C
, nominal
, 45 mA*, negative ground
dc
Overall System Performance**
Working Range: Up to 1000 ft under ideal conditions; usually somewhat less in typical applications
Emission/Modulation: Direct FM, crystal-controlled, 60F3 or 54F3
System Frequency Response: 45 Hz to 15 kHz, ±1.5 dB; 100 Hz to 10 kHz, ±0.75 dB
System Harmonic Distortion: 0.5%, maximum, below transmitter limiting; 0.2% typical at 1 kHz
System Ultimate S/N: 100 dB (flat) minimum (104 dB typical A-weighted), excluding microphone electronics and/or
**System-level performance will vary with the type of transmitter in use, its operating mode, and the control
settings. Performance values shown are representative only. Values shown are for Model T-25 transmitters.
9900 East Baldwin Place • El Monte, California 91731-2294
Telephone: (626) 442-0782 • Toll-Free: 800-877-1771
Fax: (626) 444-1342 • CompuServe: 73513,1417
FaxBack: (626) 444-2017 • Toll-Free FaxBack: 800-274-2017
element noise
www.vegawireless.com
Printed in U. S.A.
© April 2000 Vega
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