Model 550T and 550TSB Series II Modulink
Base Station Microphone User Guide
OMNIDIRECTIONAL PREAMPLIFIED DYNAMIC BASE STATION MICROPHONE
sensitivity control, located under the base, allows the op-
erator to adjust the output level. If desired, the preamplifier
can be bypassed and the microphone can be operated in
the direct output (non-amplified) mode.
An especially useful feature for shared-channel radio
systems using the Continuous Tone Coded Squelch Sys-
tem (CTCSS) is the split-bar Press-to-Talk (PTT) switch.
LThe Transmit side of the switch can only be actuated when
MODULINKSYSTEM I
the Monitor side of the switch is depressed, so the opera-
tor is forced to verify that the channel is clear before trans-
mitting. The Monitor switch can also be locked into the ?on?
position, if desired, by sliding it forward.
The 550TSB Series II microphone is functionally and
electronically identical to the 550T Series II, but it has a
single PTT switch instead of a split bar PTT switch. The
550TSB Series II can be used with trunking or other radio
systems which do not require the channel monitoring.
Note: After unpacking the microphone, removeBoth microphones are ergonomically designed; the
the protective film from the nameplatepushbuttons and grasping surfaces conform naturally to
L
the hand. The virtually indestructible ARMO-DUR case
is immune to oil, grease, most fumes and solvents, salt
GENERALspray, sun, rust and corrosion. It is outstanding in its ability
The Shure 550T and 550TSB Series II Modulink Baseto withstand mechanical shock and vibration.
Station Microphones are rugged, omnidirectional dynam-The microphones? Million-Cycle-PlusY leaf switch is de-
ic microphones with a built-in preamplifier. Designed forsigned for constant use even under extreme conditions.
optimum voice clarity, they can replace dynamic or ceram-Its nickel-silver plated blades and palladium alloy con-
ic, high- or low-impedance microphones supplied as origi-tacts resist oxidation for years.
nal equipment. Both models provide radio communica-
Features
tions, paging and dispatch systems with clear, high output
voice transmission, even in noisy environments." Modular-plug coiled cord?easily changed for other
Lradio sets or to replace defective cable. A genuine uni-
The 550T and 550TSB Series II are MODULINK uni-
versal replacement microphone
versal replacement microphones. They are compatible
with a variety of five-conductor, shielded, coil-cord cables" Built-in preamplifier with convenient external gain ad-
(sold separately), each of which has a locking, telephone-justment
type modular plug on the microphone end. One cable type
" Dynamic cartridge with omnidirectional pickup pattern
has bare tinned leads on the transmitter input end so that
the user can install any desired connector. Since cable" Frequency response tailored for optimum speech in-
damage is the major cause of microphone failure, this in-telligibility, and clear, crisp response
novation allows economical, quick and simple repairs.
" Low sensitivity to rf interference and hum pickup
The 550T and 550TSB Series II microphones have ex-
" Rugged, lockable PTT switch stands up under severe
tremely low sensitivity to hum pickup and low susceptibility
environments and constant use
to rf interference. A built-in preamplifier makes them com-
patible with biased-audio (powered audio) radio commu-" High-impact ARMO-DUR case is stronger and lighter
nications systems. An externally accessible microphonethan die-cast metal
¤ 2004, Shure Incorporated
Printed in U.S.A.
27B3024 (Rev. 7)1 |
ACEC
