Shure 592T User Guide
Model 592T User Guide
NOISE-CANCELLING ELECTRET CONDENSER MICROPHONE
GENERAL
The Shure Model 592T is a noise-cancelling replacement microphone 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 communications 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 comfortably in the hand and is not affected by heat or humidity. The rugged ARMO-DUR
solvents, salt spray, sun, rust and corrosion. It is outstanding in its
ability to withstand mechanical shocks and vibration. The Million-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 palladium-alloyed for reliable, oxidation-free operation.
The modular construction of the 592T provides excellent convenience in field servicing. The 592T is furnished with a sturdy
mounting bracket and a screwdriver to release the modular cable
plug.
case is immune to oil, grease, most fumes and
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 designedstronger 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.
1 K
+
10 Vdc
MICROPHONE INPUT CIRCUIT
FIGURE 1
620
PIN 2
15 µF
MOUNTING
The 592T is provided with a rear-case hang-up button for use
with a grounded mounting bracket on or near associated equipment.
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 microphone is on-hook; see Service Instructions for hang-up sensing
circuit modification.
©2004, Shure Incorporated
27A6002A (Rev. 2)
Printed in U.S.A.
SPECIFICATIONS
(Test conditions, unless otherwise specified: audio output measured between pin 2 and ground; PTT switch depressed; no hang-up button connection; dc VTVM 10 M
greater input impedance.)
Type
Electret condenser
Frequency Response
200 to 4,000 Hz (see Figure 2)
+10
0
Ω
or greater input impedance; ac VTVM 1 MΩ or
44.4 mm
(1-3/4 IN.)
40.4 mm
(1-19/32 IN.)
70 mm
(2-3/4 IN.)
64 mm
(2-1/2 IN.)
101 mm
(3-31/32 IN.)
–10
500 1,000 2,000 5,00010,000 20,00050 100 20020
TYPICAL FREQUENCY RESPONSE
FIGURE 2
Polar Pattern
Noise-cancelling bidirectional
Output Level (at 1,000 Hz, 1 cm)
–15 dB/100 µbar ± 5.0 dB (0.178 V)
(0 dB = 1 V/100 µbars)
DC Supply Current
2.8 mA ±0.3 mA
Hum Sensitivity
78 dB maximum equivalent SPL as measured in 12K Vac field
Audio Polarity
Positive sound pressure produces positive voltage at pin 2 with
respect to ground
Environmental Conditions
Operating Temperature:...–40
Storage Temperature:...... –16
° to 76° C (-40° to 185° F)
° to 76° C (-65° to 185° F)
Relative Humidity:...............0 to 100% (non-condensing)
Microphone Connector
6-conductor modular telephone type (6 conductors used)
Switch
Mechanical: Double-pole, single-throw, leaf-type, push-to-talk
function, normally open, cartridge shunt normally closed
Cable (optional)
Detachable, 1.4 m (48 in.), 5-conductor (1 shielded), vinyl-rubber-jacketed coil cord with modular plug on microphone end
(see table for available installed equipment plugs)
Construction
Case: Black textured high-impact ARMO-DUR
Dimensions
See Figure 3
Net Weight
105 grams (3.7 oz), less cable
REPLACEMENT PARTS
Switch Assembly ............................................... RK263S
Cable and Modular Plug ......................See cordset table
FURNISHED ACCESSORIES
Screwdriver......................................................... 80B498
Mounting Bracket................................................ RK6MB
OVERALL DIMENSIONS
FIGURE 3
MICROPHONE CABLES
The 592T can be used with various MODULINK microphone
cables. Each cable has a modular microphone plug on one end
and the user's choice of equipment plugs on the other. The MODULINK Cordset Table supplied with the 592T lists the most popular
radios with biased audio available, and the cordset (ALM-) for use
with each. Note that the ALM-1 has no connector on the equipment
end; it can be wired as needed.
The cable is attached to the 592T by inserting the modular telephone-type plug in the microphone jack until it locks. To remove the
cable from the microphone, insert the small screwdriver supplied
with the 592T in the rear case hole just above the cable jack to unlock the plug and withdraw the plug from the jack.
TABLE 1--MICROPHONE CONNECTOR WIRING
Pin Color Function Pin Color Function
1 NC — 5 Black PTT Switch
2 Red Bias (+), DC
6 White Audio
Audio Out
3 Yellow PTT Switch 7 Drain Ground
4 Blue Monitor 8 NC —
MICROPHONE END CABLE WIRING
FIGURE 4
Ground
2
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