Q700
15
System Operation and Features
selects mode "D" and remains closed as
long as any BP-700 transmits in this
mode. The auxiliary output and
associated relay closure can be used for
public address announcements or
connection to a remote ENG or
production vehicle.
Monitor Inputs and Outputs
The MS-700 has a balanced line-level
output derived from the monitor signal
buss in the master station. This output
appears on a 1/4" (6.35 mm) stereo jack
and can be used for remote master
station monitoring, local or remote
monitor speakers and similar purposes.
The level of this signal varies with the
setting of the front panel monitor
volume control. This output will be the
sum of all signals selected by the "mon"
pushbuttons on the MS-700 front panel.
If the monitor cascade is connected,
monitor audio from one or more
additional MS-700 master stations may
also be available.
The MS-700 also has fixed-level
monitor cascade inputs and outputs on
two 1/4" (6.35 mm) stereo jacks. One
jack has a single-ended monitor input
and the other a single-ended output. If
the monitor cascade output of one
MS-700 is connected to the monitor
cascade input of another MS-700, both
systems can be monitored from a
headset plugged into the last master
station in the chain. The cascade output
jack in the last master station may also
be used for external monitoring of the
monitor cascade buss.
Transmitter Control Switch
A transmitter control switch is included
on the rear panel of the MS-700. In the
"off" position, the internal transmitter is
disabled and no RF output will be
present. This mode is sometimes useful
to conserve frequencies when more
than one Q700 system is in use at a
location. In the "lo" position, the
transmitter will be on with a power
output of 50 mW, minimum. This is the
normal operating mode. In the "hi"
position, the transmitter will be on and
the power output will be 250 mW,
maximum. To minimize interference, the
“hi” mode should be used with caution,
and is most applicable to large outdoor
events.
MS-700 Fan Control
The MS-700 has a small internal cooling
fan. Normally, this fan is unnecessary
and does not operate. However, if a
MS-700 is rack mounted with a number
of other units and the ambient
temperature is high, additional cooling
may be required. When the internal
temperature of the MS-700 reaches
about 105 degrees F (41 deg. C), the fan
will begin to rotate at low speed. If the
internal temperature continues to rise,
the fan will reach full RPM when the
internal temperature reaches
approximately 150 deg. F (65 deg. C).
Rack Mounting the MS-700
The MS-700 master station may be rack
mounted by means of the supplied rack
mounting brackets. This method of
mounting is adequate for fixed use.
Screw Length Warning!
Use only the
screws supplied with the rack mounting
bracket. The length of any replacement
screws MUST BE LESS THAN 5/8” or
0.625” (15 mm) — the use of longer
mounting screws will damage internal
components of the MS-700.
However, when the master station will
be shipped while mounted in a rack,
when in wheeled cabinets, or when
rough handling is likely, additional rear
support is necessary. Vega offers
optional QRS-2 rear mounting brackets
for the MS-700, which support the back
of the unit to help the chassis resist
shock and vibration. These brackets
require the use of rear mounting rails in
the rack or cabinet, which not all such
devices have. Mechanical and electronic
damage due to extreme shock and
vibration is not covered by the Q700
warranty.
BP-700 Headset
Compatibility
The BP-700 beltpack will accommodate
headsets with dynamic and electret
microphones. The beltpack may be
externally programmed for either type
of microphone as described on page 8.
When the electret mode is programmed,
microphone preamplifier gain is reduced
and positive microphone bias is applied.
The BP-700 accepts only positive-bias
"two wire" electret microphones, with
the audio and positive bias connections
combined on one conductor. This is by
far the most common configuration for
available headsets with electret
microphones.
The BP-700 headset driver has a
balanced output and neither side can
be connected to the microphone return
lead or the connector shell without
causing severe distortion and
intermittent operation. The driver will
supply approximately 200 mW into a
50 ohm headset, and roughly 20 mW
into a 600 ohm headset. The use of
headset impedances below 25 ohms is
not recommended due to reduced
battery life.
The BP-700 comes standard with a
Neutrik™ 4-pin male XLR connector
installed. This is the same type
connector used for Vega’s previous
generations of wireless intercoms. The
BP-700 can be optionally fitted with
4-pin or 5-pin female XLR connectors at
additional cost. When using 5-pin dual
muff headsets, both earpieces will
receive the same audio.
