Model 888TT User Guide
GENERAL DESCRIPTIONFEATURES
The 888TT handheld, amplified, noise-canceling DTMF com-?FAA CERTIFIED FOR AIRCRAFT USE
munications microphone is FAA Certified for aircraft application ?
?DETACHABLE MODULINK MODULAR PLUG COIL CORD
(TSO-C58a). In addition to its extremely clear transmission, even WITH PJ-068 AIRCRAFT-RADIO PLUG OR A4M TYPE
in noisy environments, the 888TT has very low sensitivity to hum CONNECTOR
pickup and low susceptibility to radio frequency interference.
?NOISE-CANCELING WITH FREQUENCY RESPONSE
Audio and DTMF levels can be independently adjusted with the TAILORED FOR OPTIMUM INTELLIGIBILITY
supplied screwdriver to match the transmitter input gain. These ?TOP-TALK SOUND CHANNEL? FOR CLEAR VOICE INPUT,
protected external controls prevent accidental changes by the user EASY HANDLING
while allowing adjustments without having to disassemble the mi-
?BUILT-IN TRANSISTOR AMPLIFIER POWERED BY
crophone case.
CARBON-MICROPHONE-TYPE CIRCUIT
The illuminated keypad is made of tough silicone rubber, with ?ILLUMINATED KEYPAD WITH POSITIVE TACTILE
durable printed characters that will last the life of the microphone. CONFIRMATION AND AUDIBLE VERIFICATION TONES
The keypad is backlit by red LEDs, easily visible during night oper-
?SIMPLE EASY-TO-USE CONTINUOUS-TONE DIALING
ation, minimizing eye readjustment for night vision.
?SCREWDRIVER ACCESSIBLE DTMF LEVEL ADJUSTMENT,
The 888TT may be used with most currently available aircraft INDEPENDENT OF MICROPHONE GAIN SETTING
radios. For convenience, all microphone and signaling functions,
?LOW SENSITIVITY TO HUM AND RF INTERFERENCE
including keypad illumination, are powered directly from the micro-
?RUGGED MILLION-CYCLE PLUS? LEAF-TYPE SWITCH
phone input circuit of most transmitters, reducing the need for
STANDS UP UNDER SEVERE ENVIRONMENTS AND
?
equipment modification. A five-conductor MODULINK cable (sold
CONSTANT USE
separately) connects the modular telephone-type socket of the
?
?HIGH IMPACT ARMO-DUR CASE, STRONG,
888TT to most aircraft radios using a PJ-068 plug. This cable can
LIGHTWEIGHT, COMFORTABLE TO THE TOUCH IN HOT
be instantly changed or replaced without soldering.
OR COLD ENVIRONMENTS
The 888TT is ergonomical, fitting naturally and comfortably in
?RUGGED AND DEPENDABLE UNDER ALL OPERATING
the hand. The voice-entry port is at the top of the microphone body CONDITIONS
for simple, natural transmitting. The microphone is not affected by
?
heat or humidity, and the rugged ARMO-DUR case is immune to SET-UP
oil, grease, most fumes and solvents, salt spray, sun, rust and cor-
The 888TT is equipped with a hang-up loop and a rear-case
rosion. The 888TT is outstanding in its ability to withstand mechan-
hang-up button for use with a mounting bracket on associated
ical shocks and vibration. Its Million-Cycle Plus? leaf-type switch
equipment.
is a double-pole, single-throw type that resists the effects of severe
operating conditions and constant use. It has nickel-silver blades Heavy-duty chrome-plated mounting brackets are available in
with palladium alloy contacts for reliable oxidation-free operation. quantities of three as Shure Part No. RK6MB.
The microphone is supplied with output levels factory preset to
meet TSO-C58a requirements. Adjustments should be made only CONNECTIONS
by an FAA Approved Service Facility or the Shure Service Depart-To attach the cable to the 888TT, insert the modular telephone-
ment. type plug in the microphone jack until it locks.To remove the cable
from the microphone, insert the small screwdriver supplied with the
The 888TT is supplied with a small screwdriver for releasing the
888TT in case hole ?A? just above the cable jack (see Figure 4) to
modular-plug microphone cable from the case and for adjusting
unlock the plug and withdraw the plug from the jack. Microphone
the microphone amplifier gain and DTMF level. A mounting loop is
connector wiring is shown in the table below. The ALM-88 cable is
supplied affixed to the microphone, and mounting brackets for at-
wired at the microphone connector as shown in Figure 3.
taching to radio equipment or other surfaces are available in quan-
tities of three as Shure RK6MB.
Table 1. Microphone Connector Wiring
Pin Color FunctionPin Color Function
PART OF A COMPLETE LINE
1N.C.5Black PTT
Switch
The 888TT is part of a full line of mobile microphones, circuitry Ground
products and related accessories.2White Dc Bias (+),6RedAudio Out
Audio Out(Ac
For a complete listing, contact your Shure Representative or vis-coupled)
it www.shure.com.3Yellow PTT Switch7Drain Ground
4BlueNC8N.C.
APPLICATIONS
? Aerospace
?Shure, MODULINK, and ARMO-DUR are registered trademarks of Shure,
?2004, Shure IncorporatedIncorporated.? Million-Cycle Plus and Top-talk Sound Channel are trademarks of Printed in U.S.A.
27A6003B (Rev. 2)Shure Incorporated. All other trademarks are the property of their respective owners. |
ACEC
