Vega QX-6A User manual

Owner's Manual
QX-6A/QX-600 Wireless Intercom and Master Station
QTR-2/QTR-600 Wireless Remote
099-0072B

A Word to Vega Users
In selecting a Vega intercom system, you are assured of the highest quality and performance.
Vega has been the leader in wireless intercom systems for well over a decade. This experience
insures you of unequaled quality, performance, and reliability.
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.
Please feel free to contact either your authorized Vega dealer or the Vega factory for
information or assistance any time.
Introduction
This document describes the setup, adjustment, and operation of Vega's Model QX-6A/QX-
600 wireless-intercom master station and the Model QTR-2/QTR-600 wireless remote
(portable). This manual covers system operation only; detailed maintenance information is
not included. If you require maintenance information, please consult your dealer or the Vega
factory.
The master station is equipped with a maximum of six receivers for receiving up to six
portables transmitting simultaneously on different frequencies. The audio outputs of those
receivers are combined and are connected to the audio input of the master-station transmitter.
The master station transmits the combined audio on a frequency received by all portables. By
positioning the master-station antennas in an unobstructed or high location, the signals from
the portables are “repeated” over a wide area for reliable “full-duplex” communications
between up to six users (plus a seventh plugged into the master station).
The QX-6A master station and QTR-2 portable operate in the VHF band. That is, both the
transmitters and receivers can use any frequency in the 150-216 MHz range.
The QX-600 master station and QTR-600 portable unit are designed for split band operation.
The QX-600 master station transmits in the 150-216 MHz VHF band and receives signals in
the 494-806 MHz UHF band. Conversely, the QTR-600 portable transmits in the 494-806
MHz UHF band and receives signals in the 150-216 MHz VHF band.
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Table of Contents
A Word to Vega Users ............................2
Unpacking .....................................2
Introduction ....................................2
Master Station Configuration .......................3
Master Station Controls and Indicators ...............4
QTR-2/QTR-600 Wireless Portable ...................6
System Setup...................................8
Headset Compatibility ............................9
QTR-2/QTR-600/QTR-600 Sidetone Adjustment .........10
In Case of Difficulty..............................12
Warranty (Limited)...............................13
Claims ........................................13
Specifications ..................................14

The QX-6A/QX-600 master station can operate from 115/230 Vac (50/60 Hz) or +11 to +20
Vdc (1.0 A, maximum; 700 mA, nominal). The QX-6A/QX-600 has a built-in interface for
most types of wired intercoms; internal switches are provided to program the interface.
Unless otherwise requested, systems are normally supplied preset for Clear-Com
compatibility. However, they can be easily reset for operation with RTS (or other) systems.
The system includes the capability of “linking” two master stations together to form a “12-
up” system with two audio cables. A master station can also be linked to other audio
equipment. All audio interfaces are via standard two-conductor microphone cables with
three-pin XLR type connectors. A larger number of systems may be tied together through a
wired intercom system. It is also possible to tie together multiple systems without a wired
intercom if proper cable terminations are provided. Consult the Vega factory for more
information.
Two antenna connections are provided on the master station —one for the receive antenna
and one for the transmit antenna. Whip antennas have been included for use with the systems;
however, other types may be used.
Vega offers headsets for use with the QX-6A/QX-600 system. (Consult your Vega dealer or
the Vega factory for more information.) Both the QX-6A/QX-600 master station and the
QTR-2/QTR-600 portables are compatible with standard Clear-Command Beyer DT108
headsets. See Section 6 for additional information on headset compatibility.
The QTR-2/QTR-600 wireless remote is a portable transceiver designed specifically for use
with the QX-6A/QX-600 master station. It provides full-duplex “hands free” communication
between a roving user and the master station.
Two QTR-2 portables can provide direct two-way full-duplex communications without the
use of a master station. If the transmit and receive frequencies are the same, an unlimited
number of QTR-2 portables may be used in direct two-way simplex (push-to-talk)
communications without a master station. This mode of operation does not apply to QTR-600
portable units.
The QTR-2/QTR-600 operates from two 9-volt “transistor radio” batteries. Use only high-
quality batteries. See Section 8 (“Batteries”) for further details.
Vega offers a high-capacity rechargeable-battery option that attaches to the bottom of the QTR-
2/QTR-600 assembly. Properly charged, this battery provides 8-10 hours of operation.
Master Station Configuration
The QX-6A/QX-600 master station can be equipped with receive modules to support up to
six portables and an unlimited number of listen-only PL-2 portables. Your system may be
equipped for fewer portables; this may be verified by examining the serial-
number/frequency-assignment label on the bottom of the unit. The QX-6A/QX-600 consists
of up to six receivers, one transmitter, a receiver multicoupler, a power-supply subassembly,
and the main audio board. The QX-600 also includes a UHF-to-VHF downconverter as part
of the multicoupler subassembly.
The audio board contains the receiver and transmitter interface circuits, the control switching
and logic, the link circuits, and the general-purpose wired-intercom interface. The intercom
interface is programmed by means of five multiposition DIP switches.
Up to six different receive frequencies are used on the master station —one for each
supported portable. A common transmit frequency is provided by the master station for all
portables. Audio from the six receivers, the front-panel headset, the link input (if active), and
incoming intercom voice is summed and applied to the transmitter. In this way, the portables
may hear all system voice signals (including themselves). Similarly, the intercom output is
driven by all audio sources except incoming intercom audio, and the link output is driven by
all audio except “link in”. This arrangement configures the QX-6A/QX-600 and portables as
a “party line” in much the same manner as for wired intercom systems.
Wireless Intercom System 3

Master Station Controls and Indicators
The master station includes several operational controls and interface connectors. All
switches and level-adjust potentiometers that might need to be set routinely during operation
are on the front panel. Some auxiliary switches are on the master station's rear panel. No
operational controls are inside the unit. The control and connector functions are as follows:
Front Panel
For a description of the front panel, see the figure and text below.
The channel-adjust (“CH ADJ”) controls allow convenient trimming of each portable's
audio level. They are normally used to equalize audio levels when a soft-spoken person is
using one of the portables. They are not full-range controls; adjustment of the microphone
gain control in the QTR-2/QTR-600 portable may be necessary if a large level adjustment is
needed.
The “ENABLE” controls to enable/disable the audio from one or more portables. These
switches are normally used to disable the internal master-station receivers if fewer portables
are used than the number of receivers in the QX-6A/QX-600 or if a portable goes out of
range.
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Figure 1
Monitor select switch: Nine-position rotary, enabled
when “LOC/MON SEL” push button is out
Power on/off switch:
Selects ac power, dc power,
or power off
Volume control:Local-headset volume control
Headset connector: Accepts
system monitor/operator headset Power “on” LED: Indicates
power is on (ac or dc)
Channel-adjust controls: Six audio-level
potentiometers for portables 1 through 6
Intercom audio-level (out) control:
Adjusts audio level from master station
to wired-intercom system
Mic level control: Gain trim for local-headset
mic
Intercom audio-level (in) control:
Adjusts audio level from wired-
intercom to master station
“Active” LEDs: Indicates signal is being
received by QX-6A/QX-600 receivers
Transmitter “on” LED:
Indicates transmitter is active
Receiver enable switches:
Enables receivers 1 through 6
Local/monitor switch:
See text for description Intercom enable
switch: See text for
description

“ACTIVE” LEDs: indicate the associated portable is “ON” and an RF signal is being
received. These LEDs illuminate whether or not the channel has been enabled with the
associated “ENABLE” switch. This allows monitoring the status of a portable without
injecting noisy audio into the system.
The “LOC/MON SEL” switch, when “in,” activates the local headset mic and allows the
headset to be used as a local operating position. When “out,” the headset mic is disabled and
the earpiece is connected to the MON SEL switch. This switch allows monitoring of the
entire system (“ALL”), each individual portable separately (“R-1” through “R-6”), the wired
intercom only (“I/C”), or the link only (“LINK”). The “LOC/MON SEL” switch is provided
primarily for system troubleshooting, which may be done with the system “up” and
operating, without unnecessary disruption of communications. The receivers may be
monitored whether or not they are enabled with the associated ENABLE switch.
Rear Panel Description
“TX/RX ANT”: BNC connectors for transmitter and receiver antennas
Power Connections/Fuses: International power receptacle; 115/230 Vac input; terminal strip;
+11 to +20 Vdc input (reverse-polarity protected); fuses, 1 A (dc), 1/2 A (115 Vac), or 1/4 A
(230 Vac)
“INTERCOM” Connectors: One male 3-pin XLR; one female 3-pin XLR
“CH SEL” Switch: Slide switch; selects wired-intercom channel (for wired intercom
systems that have two channels such as RTS)
“TRANSMIT” Switch: Three-position slide switch; disables transmitter in center position;
continuous transmit in “ON” position (when master station is powered); transmit when any
receiver active in “PTT” position
“LINK” Connectors: Male/female 3-pin XLR for link interconnect
Link On/Off: Enables/disables link input/output
The intercom interface is programmed by means of DIP switches inside the master station.
Unless otherwise requested, systems are shipped programmed for Clear-Com compatibility
(standard Clear-Com, not the “TW” configuration). See Table 1 (next page) for instruction
for conversion to Clear-Com “TW” or RTS compatibility.
Many different types of intercom systems can be supported, including four-wire 600-ohm-
line types, all types of “carbon mic” systems, Telex Audiocom, David Clark, telephone sets
(replaces modular handset), etc. Vega has on file programming data for some types of less
common intercom systems. If Table 1 does not include information for your intercom,
consult the Vega factory for further information.
The link circuits may be used for connecting to a second master station or to other audio
equipment (e.g., console inputs and outputs, external amplified mics, monitor
speaker/amplifiers, off-air monitor receivers, etc.). The interface is at a nominal 0 dBm
line level; however, the input gain is internally adjustable over a 20 dB range.
Wireless Intercom System 5

QTR-2/QTR-600 Wireless Portable
Audio Control Switch Modes
The QTR-2/QTR-600 portable has only two operating controls: a combined on/off and
headset volume control, and a push-button audio control switch. The function of this switch is
internally programmable to any of the following three modes:
1) Push-to-mute (transmitter remains “on;” audio is continuous until interrupted by
depressing the switch). This mode allows the user to cancel transmitted audio during a
cough or during a local conversation, while continuing to transmit an unmodulated
signal (to override weaker interfering signals that might be received at the master
station).
2) Push-to-enable (transmitter remains “on;” audio is disabled until the switch is
depressed).
3) Push-to-talk (transmitter and audio are both “off” until the switch is depressed). This
mode allows simplex communications between an unlimited number of portables,
without a master station.
The use of the push-to-talk mode is discouraged for normal applications due to the
high-sensitivity of the system receivers and the possibility of weak interfering signals
being received (which often results in very noisy system output).
Typical sources of interfering signals include: spurious outputs from poorly adjusted
two-way radio transmitters; harmonic output from FM radio transmitters; radiated
harmonic energy from clock signals in computers and other digital equipment; leakage
from CATV and MATV systems; and inadequately shielded RF test equipment.
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Intercom
Interface S1 S2 S3 S4 S5
1234567891012345678123456781234567812345678
Clear-Com* XX XX X X XX
Clear-Com
(Dry)* XXX XX X X X
Clear-Com
TW* X XXX XX XXXX
RTS* XXXX XX XXXX
RTS (Dry)* X XXXX XX XXX
Telex* X X X X X XXXX X XXX
4-Wire XXXX X X XXXX
Carbon Mic
2-Wire** XXXX X X XXXX XXX
Carbon Mic
3-Wire** XXX XXXXX X XXX
Table 1. QX-6A/QX-600 master station switch settings for standard intercom systems. NOTE: “X”
designates switch is “ON”; a “blank” designates switch is “OFF”.
*Turn master station headset “SIDETONE” control (R166) to minimum.
**NOTE: Carbon-mic systems vary widely in technical implementation. If these settings do not
work properly, consult the Vega factory.

How to Set the Audio Control Switch Mode
One of the three modes previously mentioned may be selected (by jumpers) as follows:
1) Detach the QTR-2/QTR-600's battery cover and remove the two 9-volt batteries (if
installed). Remove the four small Phillips-head screws on the bottom of the unit and
carefully slide the internal chassis out of the case.
2) Locate the transmitter PCB's push-on jumpers (PCB with connections to the headset
connector and push-button switch). The jumpers are just behind the switch connector
(P2), near the battery terminals (refer to figure 1).
3) Set the CONT/PTT (P4) jumper as required (normally to the “CONT” position). In the
“CONT” position, the transmitter will always be “on” when the QTR-2/QTR-600 is
powered; in the “PTT” position, the transmitter will be “on” only when the button is
depressed.
4) Likewise, set the PT/PM jumper (P3) to the appropriate position. In the “PT” position,
the audio is enabled whenever the push button is depressed. In the “PM” position, the
audio is muted whenever the button is depressed.
NOTE: The push-to-mute (“PM”) and push-to-talk (“PTT”) modes cannot be used
together, because no audio would ever be transmitted.
An optional dual-mode switch is available for the QTR-2/QTR-600. This switch has a
miniature three-position rocker actuator and provides momentary operation on one side
and “locking” operation on the other side. The center position is “off,” corresponding
to the “off” (not depressed) position on the push button. When this optional switch is
used, no “PTT” mode is available; that is, the transmitter will always be “on”
whenever the QTR-2/QTR-600 is powered.
5) While the transceiver is out of its case, adjust the microphone gain (R14), if
necessary (refer to figure 2). Accurate adjustment will usually require the use of a
deviation meter or service monitor. However, minor adjustments can be made by
comparing audio levels from two different portables via the master station monitor
circuits. Always make sure that gain is set while using the actual headset that will be
employed with the QTR-2/QTR-600.
NOTE: The QTR-2/QTR-600 portable has an audio compressor similar to those
normally used in wired-intercom remotes. Accordingly, it is easy to set the gain too
high, resulting in an increase in background noise when the user is silent, and in
“pumping” of the compressor during speech. Do not set the mic gain higher than is
necessary to achieve adequate volume at the master station.
6) If a deviation meter is used (the recommended procedure), adjust the mic gain control
for 3.5 to 4 kHz deviation at normal user speech levels.
7) Do not adjust any controls on the QTR-2/QTR-600 receiver, as there are no user-
adjustable controls on this PCB. Misadjustment will likely require an expensive and
time-consuming return to an authorized service location or to the factory.
8) Return the QTR-2/QTR-600 to its case, making sure to feed the antenna wires or BNC
connector carefully through the holes in the bottom of the case.
The QTR-2/QTR-600 includes a small “power on” LED indicator near the volume control.
This LED has no function except to show the unit is powered. Unless the “PTT” mode has
been selected, this will also mean that the portable is transmitting.
Wireless Intercom System 7

System Setup
System setup and operation is quite simple. For the portables, simply install two 9-volt
batteries, plug in the headset, and turn the unit “on.” Install the batteries from the bottom of
the remote. Unscrew the captive screw on the battery-compartment cover to get to the
batteries. Install the two batteries with the positive (smaller) terminal toward the center of the
QTR-2/QTR-600 and oriented toward the shiny metal battery contacts. Ensure that battery
removal straps are positioned correctly alongside the batteries so they may be easily removed
when discharged. Replace the battery cover, making sure that removal tabs are folded over
the top of the batteries, out of the way of the cover.
NOTE: The battery compartment is keyed to resist incorrect insertion of the batteries. If the
batteries do not fit easily into the compartment, do not force them. Check the orientation of
the battery terminals and correct any misalignment, then reattempt insertion.
To set up the master station and balance the system, proceed as follows (refer to Figure 2 for
the location of DIP switches and controls):
1) The master station is equipped with removable rack-mounting ears and may be used
either as a desktop unit or in a rack. If it is to be rack-mounted, install the accessory
ears onto the chassis; otherwise, install the four plastic feet provided with the unit on
the chassis bottom.
2) Ensure the intercom interface is properly programmed for the type of intercom to be
used. If necessary, remove the two screws on the rear of the dust cover and slide off
the cover to get to the programming DIP switches. Use Table 1 to determine the DIP-
switch settings necessary.
3) If the master station is to be operated from 230 Vac, remove the dust cover and set the
voltage-selector switch on the front of the power supply PCB (SW4) to “230.” Replace
the dust cover and install a 1/4-A fuse in place of the 1/2-A, 115-Vac fuse.
4) If the master station is to be rack-mounted, external antennas likely will be needed. For
desktop use, the whips supplied will be satisfactory.
5) Mount the master station and connect the antennas. Also connect power (ac or dc or
both) to the unit.
6) Plug in intercom cable(s) to the rear panel. For Clear-Com “TW” and RTS operation,
the second XLR connector may be used for loop-through to the next station. For a
standard Clear-Com system, the second connector is for a second audio channel. Select
the desired I/C channel on the master station “CH SEL” switch.
7) If the link is not used, disable the circuits with the link on/off switch (rear panel). If
the link is to be used, connect the master station to the external audio equipment
(console, etc.) or to a second (slave) master station with standard two-conductor
shielded mic cables.
8) Select the transmitter mode with the “TRANSMIT” switch (rear panel). The “ON”
(continuous) mode is normally used, but the “PTT” mode should be used if the master
station will be left powered when the system is not in use. This mode automatically
shuts down the QX-6A/QX-600 transmitter when no portables are transmitting
9) Power “up” the master station and all portables to be used. Enable the active portables
via the “ENABLE” push buttons on the QX-6A/QX-600 front panel; unused channels
should be disabled to avoid possible interference. Also, enable the wired intercom. At
this point, the front-panel LEDs for all selected portables, the power LED, the TX
LED, and the I/C LED should all be “on” (assuming an RTS or Clear-Com wired
system).
10) Plug a headset into the master station front panel and select the “LOC” mode (push
button “in”). This will allow two-way communications with the portables and the
wired intercom during setup.
11) Adjust the audio levels from each portable via the “CH ADJ” (front panel)controls on
the QX-6A/QX-600 while each user is speaking. Also adjust the local headset mic
level to be approximately equal to that from the portables.
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12) Adjust, if necessary, the intercom input and output levels via the I/C IN and I/C OUT
controls. In general, the output control should be set so that wireless users have the
same apparent volume in the wired system as wired users. In the same manner, the
input level should be set so wired users have the same apparent volume in the wireless
system as the wireless portables.
13) If necessary, the “MON” function can be selected (“LOC/MON SEL” switch “out”) to
allow individually monitoring the I/C, link, and wireless portables to locate a problem.
This mode should also be used to “close” the mic in the headset during use of the
system, to prevent pickup of extraneous noise.
14) The wireless-intercom system should now be fully operational.
Headset Compatibility
As normally shipped, the QTR-2/QTR-600 and the QX-6A/QX-600 are configured for
compatibility with standard Clear-Com headsets with 4-pin full-sized XLR connectors.
These headsets have 50- or 200-ohm receivers and low-impedance dynamic microphones.
Headsets with higher impedance receivers can be used, but lower headset volume will
result. Use of headsets with impedances below 50 ohms is not recommended for the
QTR-2/QTR-600 because of reduced battery life, but impedances as low as 8 ohms are
acceptable for the QX-6A/QX-600.
The QTR-2/QTR-600 and QX-6A/QX-600 are also compatible with headsets equipped with
most types of electret mics. Units with two- or three-wire interfaces (e.g., with bias voltage
supplied on the signal lead or with a separate bias connection) are accommodated. In this
configuration, the receiver audio is single ended and will be considerably lower in level than
for the balanced configuration described above. Only headsets with high-efficiency receivers
should be used if high-earpiece volume levels will be needed.
There are several provisions in the QTR-2/QTR-600 and the QX-6A/QX-600 to
accommodate either dynamic or electret microphones. Connections from the headset to the
XLR connectors should be as shown in the following chart:
Pin No. Function
Dynamic Mic Electret Mic*
1 Mic ground Bias
2 Mic audio Mic Audio
3 Headset receiver (hi) Headset receiver
4 Headset receiver (lo) Common ground
*In the case of a two-wire electret, a 1000-ohm resistor must be installed in the XLR
connector between pins 1 and 2.
Table 2
The receiver output in the dynamic-microphone mode is balanced; that is, neither side is
grounded. Therefore, pins 3 and 4 may not be common with pin 1 (mic ground) or with the
connector shell. If this is done, low and distorted audio will result.
Other changes are necessary to convert the QTR-2/QTR-600 or QX-6A/QX-600 to operate
correctly with headsets or electret mics. In the QTR-2/QTR-600, the HEADSET
INTERFACE CONNECTOR, P1, must be installed in the correct position for dynamic or
electret mics. In addition, the GAIN SELECTOR for the mic preamp must be changed; this is
accomplished by moving the P6 jumper plug on the QTR-2/QTR-600 transmitter PCB. Refer
to Figure 2 for correct connector and jumper-plug installation.
In the QX-6A/QX-600, switch block S15 is provided to configure the local headset
connector to accommodate headsets with either dynamic or electret mics. Refer to Table 3
for the proper switch settings, and to Figure 3 for the location of S15.
Wireless Intercom System 9

QTR-2/QTR-600 Sidetone Adjustment
When the QTR-2/QTR-600 is used with a QX-6A/QX-600 master station, the QTR-2/QTR-
600 operator will hear a sidetone of his voice in his own headset. The sidetone, in this case, is
generated by the QX-6A/QX-600 master station. Therefore, the sidetone adjustment on the
QTR-2/QTR-600 transmitter board should be turned off (fully CCW).
When the QTR-2 is not used with a QX-6A master station, as in the Q+/M configuration
where two QTR-2s are used in full duplex mode, or two or more QTR-2s are operated in
simplex mode (like most walkie-talkies), the QTR-2 sidetone adjustment can be set to
provide sufficient sidetone for comfortable operation.
To set the QTR-2 sidetone adjustment, remove the battery-compartment door, batteries,
battery spring, and QTR-2 dust cover. Referring to Figure 2, locate the sidetone-adjustment
potentiometer on the QTR-2 transmitter board assembly and set it fully CCW (when the
QTR-2 is used with a master station) or to a comfortable listening level when the QTR-2 is
used without a master station. Reassemble all of the case and battery components.
The sidetone adjust in the QTR-600 should be fully CCW at all times. QTR-600 portable
units cannot be used in Q+/M configurations.
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Figure 1. Pin location for dynamic or electret mics.

Wireless Intercom System 11
MICROPHONE TYPE SWITCH
123456
DYNAMIC
ELEMENT ON OFF ON OFF OFF ON
3-WIRE
ELECTRET OFF ON OFF OFF ON ON
2-WIRE
ELECTRET OFF ON OFF ON OFF N/A
Table 3. Switch S15 program for microphone type.
Figure 2. Location diagram for master-station DIP switches.
R194

In Case of Difficulty
This section describes the most common problems that might occur. 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.
Most Vega equipment provides years of trouble-free operation. However, as with all
electronics, problems might occur. If you have trouble with Vega equipment 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.
Most difficulties are not due to equipment failure. Vega equipment is fully tested before
leaving the factory. Usually, problems are due to equipment application.
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 Vega to perform a
complete checkout and test of the entire system. This can be especially helpful for elusive or
intermittent problems
Battery
The most common problems with wireless intercoms are related to the beltpack batteries.
Exhausted batteries will cause numerous problems, including distortion, audible squeals and
howls, poor range, and off-frequency operation. Check batteries prior to each use, and replace
them if there is any question about their condition. It is also good practice to replace the battery
with a fresh unit when having any sort of problem occurs with the system, because a low battery
may affect system operation in subtle ways.
Vega recommends only new, fresh Duracell or Eveready alkaline batteries be used. No other
batteries tested by Vega provide equal life and equivalent reliability.
The only acceptable rechargeable batteries known to Vega are the Varta and Plainview, which
are true 7-cell (9 volt) designs. Even here, the usable life will be much less than for a Duracell
(usually three to four hours). Rechargeable cells (“ni-cads”) commonly sold are usually 7.2
volts instead of 9 volts and provide only a few minutes of operation.
Beltpack battery contacts must be clean and unbroken. Attempted forced reverse insertion of
a battery is practically impossible, but the attempt will often damage the battery contacts.
Interference
Vega wireless-intercom 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. As mentioned above, this can be a particular problem if the receiver audio
is left open (receiver enabled) when the transmitter is turned off.
Problems with RF noise sources (fluorescent and neon 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.
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 surprisingly rare.
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A more serious problem is selection of wireless-intercom operating frequencies, which are
inherently subject to interference due to intermodulation. Fortunately, a proper initial selection of
or changing frequencies will usually 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 occur. Should this happen, contact the Vega factory or your sales representative for
assistance.
General
It is best 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.
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 might not apply to you. This warranty gives the customer specific
legal rights, and there might be other rights which vary from state to state.
Vega's 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 to the nearest authorized service center.
IMPORTANT: Be sure your exact return address, name and telephone number, and a
description of the symptoms are enclosed inside the package with your equipment.
It is essential to return the entire system for a full system performance test, if at all practical.
Factory Service Center:
Vega
9900 East Baldwin Place
El Monte, CA 91731-2294
[phone]
800-877-1771
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.
Wireless Intercom System 13

Specifications
QTR-2 Beltpack Transceiver
Frequency Range: 150-216 MHz
Frequency Stability: ±0.005%, –20°C to +60°C
Transmitter Power Output: 45-50 mW into 50 Ω
Transmitter Harmonics: Better than –60 dBc
Transmitter Spurs: Better than –50 dBc
Transmitter Frequency Deviation: ±6 kHz, peak
Receiver Sensitivity: Better than 0.75 µV for 30 dB S/N
Receiver Image Rejection: 75 dB minimum
Receiver Distortion: 2% worst case
Receiver Ultimate S/N: 80 dB minimum (20 kHz flat)
Receiver Output Level: 0 to 3 Vrms into 50 Ω(175 mW) (with balanced output)
Power: 6.5 to 9.5 Vdc from 9-V battery
Current Drain: Transmitter and receiver each approximately 35 mA
Battery Life: 8 to 10 hours
Audio Frequency Response: 70 Hz to 7.5 kHz, at –3 dB
Controls: Combined off/on and volume control;
programmable push-to-talk/mute/transmit switch
Indicator: LED power “ON”
Range: To 1000 ft, or more (line of sight);
somewhat less under typical conditions
Size: 3.8 in (9.7 cm) W ×5.2 in (13.2 cm) L ×1.5 in (3.8 cm) thick
Weight: 1.1 lbs (0.5 kg)
Temperature Range: –20°C to +60°C
Construction: High-impact ABS control panel;
one-piece anodized aircraft alloy case
QX-6A Wireless Master Station
Frequency Range: 150-216 MHz
Frequency Stability: ±0.005%, –20°C to +50°C
Transmitter Power Output: 45-50 mW into 50 Ω
Transmitter Harmonics: Less than –60 dBc
Transmitter Spurs: Less than –60 dBc
Transmitter Frequency Deviation: ±6 kHz, peak
Receiver Sensitivity: Better than 0.75 µV for 30 dB S/N
Receiver Image Rejection: 80 dB minimum
Receiver Frequency Response: 70 Hz to 7.5 kHz, at –3 dB
14 Q PLUS

Receiver Distortion: 2% (worst case)
Receiver Ultimate S/N: 80 dB minimum
Intercom Interface: Various; programmed internally
Power Supply: 115/230 Vac, 50/60 Hz, 20 W maximum or external +11.5 to +32
Vdc
Range: To 1000 ft, or more (line of sight), somewhat less under typical
conditions
Size: 16.75 in (42.5 cm) W, or 19.0 in (48.26 cm) W with optional rack
mounting ears, ×10.0 in (25.4 cm) D ×3.5 in (8.89 cm) H
Weight: 11.3 lbs (5.13 kg)
Temperature Range: –20°C to +60°C
Construction: Aircraft-alloy aluminum
QTR-600 Beltpack Transceiver
Frequency Range: 150-216 MHz (receive)
494-806 MHz (transmit)
Frequency Stability: ±0.005%, –20°C to +60°C
Transmitter Power Output: 100 mW into 50 Ω
Transmitter Harmonics: Better than –60 dBc
Transmitter Spurs: Better than –50 dBc
Transmitter Frequency Deviation: ±37 kHz, peak
Receiver Sensitivity: Better than 0.75 µV for 30 dB S/N
Receiver Image Rejection: 75 dB minimum
Receiver Distortion: 2% worst case
Receiver Ultimate S/N: 80 dB minimum (20 kHz flat)
Receiver Output Level: 0 to 3 Vrms into 50 Ω(175 mW) (with balanced output)
Power: 6.5 to 9.5 Vdc from 9-V battery
Audio Frequency Response: 70 Hz to 7.5 kHz, at –3 dB
Controls: Combined off/on and volume control;
programmable push-to-talk/mute/transmit switch
Indicator: LED power “ON”
Range: To 1000 ft, or more (line of sight);
somewhat less under typical conditions
Size: 3.8 in (9.7 cm) W ×5.2 in (13.2 cm) L ×1.5 in (3.8 cm) thick
Weight: 1.1 lbs (0.5 kg)
Temperature Range: –20°C to +60°C
Construction: High-impact ABS control panel;
one-piece anodized aircraft-alloy case
Wireless Intercom System 15

QX-600 Wireless Master Station
VHF Frequency Range: 150-216 MHz (transmit)
494-806 MHz (receive)
VHF Frequency Stability: ±0.005%, –20°C to +50°C
VHF Transmitter Power Output: 45-50 mW into 50 Ω
VHF Transmitter Harmonics: Less than –60 dBc
VHF Transmitter Spurs: Less than –60 dBc
Transmitter Frequency Deviation: ±6 kHz, peak
Receiver Sensitivity: Better than 0.75 µV for 30 dB S/N
Receiver Image Rejection: 80 dB minimum
Receiver Frequency Response: 70 Hz to 7.5 kHz, at –3 dB
Receiver Distortion: 2% (worst case)
Receiver Ultimate S/N: 80 dB minimum
Intercom Interface: Various; programmed internally
Power Supply: 115/230 Vac, 50/60 Hz, 20 W maximum or external +11.5 to +32
Vdc
Range: To 1000 ft, or more (line of sight), somewhat less under typical
conditions
Size: 16.75 in (42.5 cm) W, or 19.0 in (48.26 cm) W with optional rack
mounting ears, ×10.0 in (25.4 cm) D ×3.5 in (8.89 cm) H
Weight: 11.3 lbs (5.13 kg)
Temperature Range: –20°C to +60°C
Construction: Aircraft-alloy aluminum
16 Q PLUS
www.vegawireless.com
9900 East Baldwin Place • El Monte, California 91731-2294
Telephone: [phone] • Toll-Free: 800-877-1771
Fax: [phone] • CompuServe: 73513,1417
FaxBack: [phone] • Toll-Free FaxBack: 800-274-2017
Printed in U.S.A.
© April 2000 Vega