Shure 550T User Manual

OMNIDIRECTIONAL PREAMPLIFIED DYNAMIC BASE STATION MICROPHONE

MODULINK
Note: After unpacking the microphone, remove
the protective film from the nameplate
GENERAL
The Shure 550T and 550TSB Series II Modulink Base
Station Microphones are rugged, omnidirectional dynam-
ic microphones with a built-in preamplifier. Designed for
optimum voice clarity, they can replace dynamic or ceram-
ic, high- or low-impedance microphones supplied as origi-
nal equipment. Both models provide radio communica-
tions, paging and dispatch systems with clear, high output
voice transmission, even in noisy environments.
The 550T and 550TSB Series II are MODULINK
versal replacement microphones. They are compatible
with a variety of five-conductor, shielded, coil-cord cables
(sold separately), each of which has a locking, telephone-
type modular plug on the microphone end. One cable type
has bare tinned leads on the transmitter input end so that
the user can install any desired connector. Since cable
damage is the major cause of microphone failure, this in-
novation allows economical, quick and simple repairs.
The 550T and 550TSB Series II microphones have ex-
tremely low sensitivity to hum pickup and low susceptibility
to rf interference. A built-in preamplifier makes them com-
patible with biased-audio (powered audio) radio commu-
nications systems. An externally accessible microphone
2004, Shure Incorporated
27B3024 (Rev. 7)
Model 550T and 550TSB Series II Modulink
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.
systems using the Continuous Tone Coded Squelch Sys-
tem (CTCSS) is the split-bar Press-to-Talk (PTT) switch.
The Transmit side of the switch can only be actuated when
SYSTEM 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.
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.
pushbuttons and grasping surfaces conform naturally to
the hand. The virtually indestructible ARMO-DUR
is immune to oil, grease, most fumes and solvents, salt
spray, sun, rust and corrosion. It is outstanding in its ability
to withstand mechanical shock and vibration.
signed for constant use even under extreme conditions.
Its nickel-silver plated blades and palladium alloy con-
tacts resist oxidation for years.
Features
•

uni-
•
•
•
•
•
•
1
Base Station Microphone User Guide
An especially useful feature for shared-channel radio
The 550TSB Series II microphone is functionally and
Both microphones are ergonomically designed; the
The microphones' Million-Cycle-Plus leaf switch is de-
Modular-plug coiled cord—easily changed for other
radio sets or to replace defective cable. A genuine uni-
versal replacement microphone
Built-in preamplifier with convenient external gain ad-
justment
Dynamic cartridge with omnidirectional pickup pattern
Frequency response tailored for optimum speech in-
telligibility, and clear, crisp response
Low sensitivity to rf interference and hum pickup
Rugged, lockable PTT switch stands up under severe
environments and constant use
High-impact ARMO-DUR case is stronger and lighter
than die-cast metal

case
Printed in U.S.A.