Model 592T User Guide
©
2004, Shure Incorporated
27A6002A (Rev. 2)
Printed in U.S.A.
NOISE-CANCELLING ELECTRET
CONDENSER MICROPHONE
GENERAL
The Shure Model 592T is a noise-cancelling replacement micro-
phone for many mobile radio sets. The microphone is 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, and a choice of popular transmitter
input connectors on the other. One cable model provides only bare
tinned leads on the transmitter input end so that the user can install
the desired connector. Since cable damage is the major cause of
microphone failure, this makes the 592T among the first communi-
cations microphones to offer economical, quick and simple repair
capability.
The 592T is rugged and reliable. It has a bidirectional pickup
pattern and provides extremely clear transmission, especially in
noisy environments. In addition to its clear, crisp response, tailored
for voice-frequency communications, the 592T has extremely low
sensitivity to hum pickup and low susceptibility to radio-frequency
interference.
The 592T is ergonomically designed; it fits naturally and com-
fortably in the hand and is not affected by heat or humidity. The rug-
ged ARMO-DUR
case is immune to oil, grease, most fumes and
solvents, salt spray, sun, rust and corrosion. It is outstanding in its
ability to withstand mechanical shocks and vibration. The Mil-
lion-Cycle Plus leaf-type switch is a double-pole, single-throw type,
designed to resist the effects of severe operating conditions and
constant usage. It has nickel-silver blades, and its contacts are pal-
ladium-alloyed for reliable, oxidation-free operation.
The modular construction of the 592T provides excellent conve-
nience in field servicing. The 592T is furnished with a sturdy
mounting bracket and a screwdriver to release the modular cable
plug.
Features
•
Modular-plug coil-cord-easily changed for other radio sets or to
replace defective cable
•
Noise-cancelling bidirectional pickup pattern
•
Frequency response from 200 to 4,000 Hz, tailored for voice
communications
•
Built-in transistor amplifier powered by biased audio from radio
set
•
Low sensitivity to hum pickup
•
Low susceptibility to radio frequency interference
•
Rugged Million-Cycle Plus™ leaf-type switch stands up under
severe environments and constant use
•
Usable in high-ambient-noise environments
•
High-impact ARMO-DUR
case is ergonomically designed-
stronger and lighter than die-cast metal, comfortable to the
touch in hot or cold weather
•
Rugged and dependable under all operating conditions
•
Long-life vinyl-rubber-jacketed coil cord available with plugs to
fit most popular two-way radios
•
Sturdy, convenient mounting button for attaching to equipment
or nearby surface using supplied mounting bracket
RADIO INPUTS
The 592T operates with two-way radio sets with input circuits
similar to that shown in Figure 1.
MICROPHONE INPUT CIRCUIT
FIGURE 1
MOUNTING
The 592T is provided with a rear-case hang-up button for use
with a grounded mounting bracket on or near associated equip-
ment.
IMPORTANT:
The microphone hang-up button is connected to
the blue lead (modular connector pin 4) for radios with microphone
hang-up sensing.
NOTE:
Certain radio sets require an open circuit when the mi-
crophone is on-hook; see
Service Instructions
for hang-up sensing
circuit modification.
1 K
+
10 Vdc
PIN 2
15 µF
620
