MODEL 590T
Hand-Held Transistorized Dynamic Microphone
The Shure Model 590T is a universal replacement microphone
for over 40 mobile two-way 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 590T quick and simple to repair.
For installations where input gain requires sensitivity level adjustment, the 590T has a convenient, externally accessible screwdriver control. This eliminates the problem of non-adjustable
microphone levels and the necessity for disassembling the microphone for adjustments. Restricting control access also prevents
accident-al changes common to external controls. The 590T can
also be used in the non-amplified mode required by certain
two-way radios.
The 590T is a hand-held, transistorized, dynamic microphone
designed for rugged and reliable operation. It has an omnidirectional pickup pattern and provides extremely clear transmission,
even in noisy environments. In addition to its clear, crisp response,
tailor-ed for voice-frequency communications, the 590T has extremely low sensitivity to hum pickup and low susceptibility to radio-frequency interference.
In addition to its attractive, contemporary styling, designed to
blend with most radio designs and vehicle interiors, the 590T's
case features wraparound Top-Talk Sound Channels™. If the
microphone is grasped so that the front sound entry ports are covered, the sound channels extending around the top of the case permit clear sound entry through the top.
Model 590T User Guide
The microphone is ergonomically designed; it fits naturally and
comfortably in any hand and is not affected by heat or humidity.
The rugged ARMO-DUR
fumes and 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 590T provides excellent
con-venience in field servicing. In addition to the plug-in cable,
the cartridge and switch are easily replaced in minutes, should replacement ever be necessary. The microphone wiring is channeled
so that wire crimping or breaking is not a concern.
The 590T is supplied with a small screwdriver which can be
used for both adjusting the microphone amplifier gain and releasing the modular-plug microphone cable from the microphone.
Mounting brackets for affixing to equipment or other surfaces are
available as Shure RK6MB.
Features
•
Modular-plug coil-cord easily changed for other radio sets or to
replace defective cable. A genuine universal replacement microphone
•
Convenient external gain adjustment for accommodating most
microphone input circuits
•
Frequency response from 200 to 4,000 Hz, tailored for voice
communications
•
Built-in transistor amplifier powered by carbon microphone-type
circuit (usable without transistor amplifier)
•
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
•
Top-Talk Sound Channels™ for clear voice input,
easy handling
•
High-impact ARMO-DUR case is ergonomically designedstronger and lighter than die-cast metal, comfortable to the
touch in hot or cold weather
•
Rugged, reliable and dependable under all operating conditions
•
Long-life vinyl-rubber-jacketed coil cord available with plugs to
fit most popular two-way radios
•
Hang-up button connection available for microphone hang-up
sensing
•
Sturdy, convenient mounting button for attaching to equipment
or nearby surface using optional mounting bracket
case is immune to oil, grease, most
©2004, Shure Incorporated
27A6001A (Rev. 2)
Printed in U.S.A.
RADIO INPUTS
The 590T operates with two-way radio sets with input
circuits similar to those in Figure 1.
560
+
8–13
VDC
AB
TO
PIN
2
TO
PIN
+
9.6
VDC
7
MICROPHONE INPUT CIRCUITS
FIGURE 1
The 590T can also be used as a non-powered dynamic communications microphone by bypassing the transistor amplifier. In
these cases, only pin 6 (white) and pin 7 (ground) are used.
MOUNTING
The 590T is provided with a rear-case hang-up button for use with a 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.
Heavy-duty, chrome-plated mounting brackets are available in quantities of three as Shure Part No. RK6MB.
SPECIFICATIONS
(Test conditions unless otherwise specified: audio output measured between pin 2 and ground; PTT switch depressed; no hangup button connection; mic level trimmer full clockwise; de VTVM 10
megohms or greater input impedance; ac VTVM 1 megohm or
greater input impedance; test circuit as shown in Figure 1 B).
Type
Dynamic (with transistor preamplifier; direct cartridge output
available)
Frequency Response
200 to 4,000 Hz (see Figure 2)
5601K
+
TO
PIN
2
TO
PIN
7
Direct Output (pin 6 to ground, test circuit disconnected)
Sensitivity (at 1,000 Hz, 5/16 in.)
-35 dB (17.8 mV) (0 dB = 1V/100 microbars)
Impedance (1,000 Hz)
200 ohms ±10%
Audio Polarity
Audio output voltage at pin 2 is opposite polarity to voltage produced at pin 6 with respect to ground
Environmental Conditions
Temperature: -40° to 74°C (-40° to 165°F)
Relative Humidity: 0 to 95% (non-condensing)
Microphone Connector
8-conductor modular telephone type (6 conductors used)
Switch
Double-pole, single-throw, leaf-type, push-to-talk function, normally open, cartridge shunt normally closed
Cable (optional choice)
Detachable, 1.2 m (48 in.), 5-conductor (1 shielded), vinylrubber-jacketed coil cord with modular plug on microphone end
(see supplied table for available installed equipment plugs)
Case
Black high-impact ARMO-DUR
Dimensions
See Figure 3
Net Weight
156 grams (5.5 oz) less cable
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
0
–10
500 1,000 2,000 5,00010,000 20,00050 100 20020
TYPICAL FREQUENCY RESPONSE
FIGURE 2
Polar Pattern
Omnidirectional
Sensitivity (amplified output, at 1,000 Hz, 5/16)
-10.5 dB (0.3 V) (0 dB = 1 volt per 100 microbars)
DC Supply Current
2.5 ±0.25 mA
Hum Sensitivity
-38 dBV maximum in a 1 oersted, 60 Hz field
OVERALL DIMENSIONS
FIGURE 3
FURNISHED ACCESSORY
Screwdriver ................................................................ 80B498
OPTIONAL ACCESSORY
Mounting Bracket ....................................................... RK6MB
REPLACEMENT PARTS
Cartridge ........................................................................R147
Switch........................................................................RK263S
Printed Circuit Board Assembly .................................. RK262
Cable and Modular Plug............................. See cordset table
For additional technical assistance, phone Shure at
1-847-600-8440. In Europe, phone 49-7131-72140.
2
BUTTON
MOVEMENT
SWITCH
BLADE
ASSEMBLY
CARTRIDGE
HANG UP
BUTTON
RED
BLUE
GREEN
signed 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 590T by inserting the modular telephone-type plug in the microphone jack until it locks. To remove
the cable from the microphone, insert the small screw driver supplied with the 590T in the rear case hole just above the cable jack
to unlock the plug and withdraw the plug from the jack.
Pin Color Function Pin Color Function
WHITE
GREEN
BLACK*
YELLOW*
*COLORS REVERSED
ON EARLY PRODUCTION UNITS
G
F
E
D
C
B
A
WIRING DIAGRAM
FIGURE 4
MICROPHONE CABLES
The 590T 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 590T lists the most popular
radios with biased audio available, and the cordset (ALM-) de-
WHT
F
CW
G
RED
+
MK1
GRN
GRN
S1
R1
5K
D
E
C1
1x50
R3
15K
R2
68K
+
C8
F
120
p
C3
.001
Q1
86A350
C6
.001
1 - N.C. 5 Black PTT Switch
Ground
2Red Bias (+),
DC
Audio Out
6 White Audio Out
Non-
Amplified
3 Yellow PTT Switch 7 Drain Ground
4 Blue Hang-up
8 - N.C.
button
120
C7
F
p
J1
NOTES:
1 . ALL RESISTORS 5% 1/4W UNLESS OTHER-
WISE SPECIFIED.
2 . ELECTROLYTIC CAPACITORS IN MICROFA-
RADS X VOLTS, ALL OTHER IN MICROFARADSAND 50V OR GREATER UNLESS OTHERWISE
SPECIFIED.
3 . * COLORS REVERSED IN EARLY PRODUCTION
MODELS.
HANG-UP
BUTTON
P1
BLU
*BLK
*YEL
R5
150K
SP1
A
C
B
C2
100x16
R4
22
+
C4
.001
C5
120
F
p
WIRING DIAGRAM
FIGURE 4
3
SHURE Incorporated Web Address: http://www.shure.com
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
In U.S.A., Phone: 1-847-600-2000 Fax: 1-847-600-1212
In Europe, Phone: 49-7131-72140 Fax: 49-7131-721414
In Asia, Phone: 1-852-2893-4290 Fax: 1-852-2893-4055
International Fax: 1-847-600-6446
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