auxiliary output with associated relay on the base
station — for paging and announcements.
The WBS-680 adds another wired intercom con-
nector section on the rear panel, plus a stage-
announce output and relay contact. Front-panel
controls and indicators give control and status
information about all of these communication con-
nections. Also, a base-station link connector per-
mits the “wireless talk around” to be shared
among base stations.
Frequency-Agile UHF Operation
The WBS-670 and WBS-680 operate in selected
frequency bands between 518 – 740 MHz. Three
different sets are available for compatibility virtual-
ly anywhere. An 18 MHz (three U.S. TV channels)
frequency window is used for the
base-station
transmitter, with a separate 18MHz
window for the
beltpack transmit frequencies (base-station receive
frequencies). These bands are each divided into
740 distinct frequencies at 25 kHz intervals. The
WBS-680 has two different base-station transmit
frequencies — one each for intercom channels
A and B.
Adjustable Transmitter Power
The base-station transmitter has a high-power set-
ting of 100 mW (WBS-670 is 50mW), a low-power
setting of 10 mW for closer distance use, and may
be turned off when necessary for setup and link-
ing. The beltpack transmitters have built-in sensing
circuitry that drops the normal 50 mW output by
10 dB whenclose to the base station, to prevent
de-sensing of its receivers.
Pre-Selected Compatible Frequencies
and Frequency Scan
System setup is a snap using the 24 internal pre-
selected and intermodulation-free frequency
groups. Aided by the “scan” function, which sens-
es the local RF environment and determines which
of the frequency groups has the largest number of
clear frequencies, base stations and beltpacks can
typically be coordinated and working together
within minutes. A dozen more memory locations
are allocated for user-programmable groups, so
that particular sets of frequencies can be chosen,
programmed, and saved as a new preset.
Great Audio Quality and Range
Perhaps you’ve experienced that many of the avail-
able options for adding wireless capability to the
intercom system end up sounding like a telephone
or a two-way radio–intelligible but not great. The
audio quality of the WBS-670 and WBS-680 is on a
par with that of a professional party-line or digital
matrix intercom, so voice communications and pro-
gram material sound more natural and less fatigu-
ing. Efficient antennas and sensitive receiver
design lead to excellent range for reliable use at a
distance. A variety of remote antenna options,
such as quarter-wave ground-plane and log-peri-
odic, enhance that range and help with difficult
production environments.
Internal Audio Routing Options
Circuit paths on the WBS-680 main board may be
wired, either internally or externally, to give vari-
able-level dual-listen features to the beltpacks —
one can hear channel A when talking on B, and
vice-versa. This feature is set at the base station
and affects all beltpacks identically. Also, base-
station internal switching can place auxiliary audio
on beltpack channel B only, or on both A and B.
Rechargeable Battery Option
The convenient battery pack will operate the belt-
pack in full-duplex mode for 14 hours with a set of
alkaline batteries. The optional rechargeable
NiMH (nickel metal hydride) batteries will give
over 11 hours of continual use — enough to cover
the entire production from setup to teardown. A 4-
bay charger keeps a system’s worth of batteries at
the ready.
audio clarity | frequency agility | ease-of-use | dependability
(16 paginas)
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