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Model AM8T User Guide

©

2004, Shure Incorporated

27A6005B (Rev. 2)

Printed in U.S.A.

GENERAL DESCRIPTION

The AM8T handheld, amplified, noise-canceling DTMF commu-

nications microphone is FAA Certified for aircraft application (TSO-
C58a). In addition to its extremely clear transmission, even in noisy 
environments, the AM8T has very low sensitivity to hum pickup 
and low susceptibility to radio frequency interference.

Audio and DTMF levels can be independently adjusted with the 

supplied screwdriver to match the transmitter input gain. These 
protected external controls prevent accidental changes by the user 
while allowing adjustments without having to disassemble the mi-
crophone case.  

The microphone has an illuminated keypad made of tough sili-

cone rubber, with durable printed characters that will last the life of 
the microphone. The keypad is backlit by red LEDs, easily visible 
during night operation, minimizing eye readjustment for night vi-
sion. 

The AM8T is designed for use with most currently available air-

craft radios. For convenience, all microphone and signaling func-
tions, including keypad illumination, are powered directly from the 
microphone input circuit of most transmitters, reducing the need for 
equipment modification. A five-conductor MODULINK

®

 

cable (sold 

separately) connects the modular telephone-type socket of the 
AM8T to most aircraft radios using a PJ-068 plug. This cable can 
be instantly changed or replaced without soldering. 

The AM8T is ergonomical, fitting naturally and comfortably in 

the hand. The voice-entry port is at the top of the microphone body 
for simple, natural transmitting. The microphone is not affected by 
heat or humidity, and the rugged ARMO-DUR

®

 

case is immune to 

oil, grease, most fumes and solvents, salt spray, sun, rust and cor-
rosion. The AM8T is outstanding in its ability to withstand mechan-
ical shocks and vibration. Its Million-Cycle Plus™ leaf-type switch 
is a double-pole, single-throw type that resists the effects of severe 
operating conditions and constant use. It has nickel-silver blades 
with palladium alloy contacts for reliable oxidation-free operation. 

The microphone is supplied with output levels factory preset to 

meet TSO-C58a requirements. Adjustments should be made only 
by an FAA Approved Service Facility or the Shure Service Depart-
ment. 

The AM8T is supplied with a small screwdriver for releasing the 

modular-plug microphone cable from the case and for adjusting 
the microphone amplifier gain and DTMF level. A nickel-plated 
steel mounting bracket is included for mounting on or near radio 
equipment. 

PART OF A COMPLETE LINE

The 598T is part of a full line of mobile microphones, circuitry 

products and related accessories.

For a complete listing, contact your Shure Representative or vis-

it www.shure.com.

APPLICATIONS

 Aerospace

FEATURES

FAA CERTIFIED FOR AIRCRAFT USE

DETACHABLE MODULINK

®

 MODULAR PLUG COIL CORD 

WITH PJ-068 AIRCRAFT-RADIO PLUG OR A4M TYPE 

CONNECTOR

NOISE-CANCELING WITH FREQUENCY RESPONSE 

TAILORED FOR OPTIMUM INTELLIGIBILITY

TOP-TALK SOUND CHANNEL™ FOR CLEAR VOICE INPUT, 

EASY HANDLING

BUILT-IN TRANSISTOR AMPLIFIER POWERED BY 

CARBON-MICROPHONE-TYPE CIRCUIT

ILLUMINATED KEYPAD WITH POSITIVE TACTILE 

CONFIRMATION AND AUDIBLE VERIFICATION TONES

SIMPLE EASY-TO-USE CONTINUOUS-TONE DIALING

SCREWDRIVER ACCESSIBLE DTMF LEVEL ADJUSTMENT, 

INDEPENDENT OF MICROPHONE GAIN SETTING

LOW SENSITIVITY TO HUM AND RF INTERFERENCE

RUGGED MILLION-CYCLE PLUS™ LEAF-TYPE SWITCH 

STANDS UP UNDER SEVERE ENVIRONMENTS AND 

CONSTANT USE

HIGH IMPACT ARMO-DUR

®

 CASE, STRONG, 

LIGHTWEIGHT, COMFORTABLE TO THE TOUCH IN HOT 

OR COLD ENVIRONMENTS

RUGGED AND DEPENDABLE UNDER ALL OPERATING 

CONDITIONS

SET-UP

The AM8T is equipped with a rear-case hang-up button for use 

with a mounting bracket on associated equipment.

CONNECTIONS

To attach the cable to the AM8T, insert the modular telephone-

type plug in the microphone jack until it locks. To remove the cable 
from the microphone, unlock the plug by inserting the small screw-
driver supplied with the AM8T in case hole “A” just above the cable 
jack (see Figure 4). Microphone connector wiring is shown in the 
table below. The ALM-88 cable is wired at the microphone connec-
tor as shown in Figure 3.

Table 1. Microphone Connector Wiring

Pin Color

Function

Pin

Color Function

1

N.C.

5

Black

PTT

Switch

Ground

2

White

 Dc  Bias (+),

Audio Out

6

Red

Audio Out

(Ac

coupled)

3

Yellow PTT Switch

7

Drain

Ground

4

Blue

NC

8

N.C.

®Shure, MODULINK, and ARMO-DUR are registered trademarks of Shure, 
Incorporated.™ Million-Cycle Plus and Top-talk Sound Channel are trademarks of 
Shure Incorporated. All other trademarks are the property of their respective owners.

Содержание AM8T

Страница 1: ...uld be made only by an FAA Approved Service Facility or the Shure Service Depart ment The AM8T is supplied with a small screwdriver for releasing the modular plug microphone cable from the case and for adjusting the microphone amplifier gain and DTMF level A nickel plated steel mounting bracket is included for mounting on or near radio equipment PART OF A COMPLETE LINE The 598T is part of a full l...

Страница 2: ... Figure 4 as required SPECIFICATIONS Type Electret condenser noise canceling with transistor pre amplifi er DTMF signaling circuitry illuminated keypad Frequency Response 200 to 4 000 Hz see Figure 1 TYPICAL FREQUENCY RESPONSE FIGURE ONE Polar Pattern Bidirectional noise canceling Electrical Characteristics Environmental Conditions Operating Temperature 40 to 60 C 40 to 140 F Storage Temperature 5...

Страница 3: ...contrary to Shure s instruction ordinary wear and tear an act of God or unauthorized repair All implied WARRAN TIES OF MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE are hereby disclaimed and Shure hereby disclaims lia bility for incidental special or consequential damages resulting from the use or unavailability of this product Some states do not allow limitations on how long an implied warr...

Страница 4: ... 6 1 Microphone tested at altitude equivalent to 15 200 m 50 000 ft 11 6 kPa 116 mbar 87 mm 3 42 in Hg 3 1 4 Decompression 4 6 2 Microphone tested at altitude equivalent to 15 200 m 50 000 ft 3 1 5 Overpressure 4 6 3 Microphone tested at pressure 170 kPa equiv alent altitude 15 000 ft 2 11 3 2 Temperature Variation Pre amplifier 5 3 Microphone tested to Category B for two cycles 3 3 Humidity 6 3 1...

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