Shure Microphone 888TT User Manual

Shure Brothers Incorporated  
222 Hartrey Avenue  
Evanston IL 60202-3696 U.S.A.  
Model 888TT User Guide  
DTMF AIRCRAFT MICROPHONE  
humidity. The voice-entry port is at the top of the micro-  
phone body for simple, natural transmitting. The rugged  
ARMO-DUR case is immune to oil, grease, most fumes  
and solvents, salt spray, sun, rust and corrosion. The  
888TT is outstanding in its ability to withstand mechanical  
shocks and vibration. Its Million-Cycle PlusTM leaf-type  
switch is a double-pole, single-throw type, designed to re-  
sist the effects of severe operating conditions and constant  
use. It has nickel-silver blades with palladium-alloy con-  
tacts 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 Department.  
The 888TT is supplied with a small screwdriver for re-  
leasing the modular-plug microphone cable from the case  
and for adjusting the microphone amplifier gain and DTMF  
level. A mounting loop is supplied affixed to the micro-  
phone, and mounting brackets for attaching to radio equip-  
ment or other surfaces are available in quantities of three  
as Shure RK6MB.  
The Shure Model 888TT is handheld, amplified, noise–  
cancelling DTMF communications microphone that is FAA  
Certified for aircraft application (TSO-C58a). In addition to  
its extremely clear transmission, even in noisy environ-  
ments, the 888TT has very low sensitivity to hum pickup  
and low susceptibility to radio frequency interference.  
Features:  
In instances where transmitter input gain requires micro-  
phone sensitivity modification, the 888TT has limited ac-  
cess external screwdriver controls for independent adjust-  
ment of both mic audio and DTMF levels. This eliminates  
the problem of fixed audio levels that require disassem-  
bling the microphone for adjustments. Restricted control  
access, however, prevents accidental changes common to  
other types of external controls.  
FAA Certified for aircraft use  
Detachable MODULINK modular-plug coil cord with  
PJ-068 aircraft-radio plug  
Noise-canceling with frequency response tailored for  
optimum intelligibility  
Top-Talk Sound ChannelTM for clear voice input, easy  
handling  
The microphone has an illuminated keypad made of  
tough silicone 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 vision.  
Built-in transistor amplifier powered by carbon-micro-  
phone-type circuit  
Illuminated keypad with positive tactile confirmation  
and audible verification tones  
Convenient screwdriver-accessible microphone gain  
adjustment accommodates most input circuits  
The 888TT is designed for use with most currently avail-  
able aircraft radios. For installation convenience, all micro-  
phone and signaling functions, including keypad illumina-  
tion, are powered directly from the microphone input circuit  
of most transmitters, reducing the need for equipment  
modification. A three-conductor MODULINK cable (sold  
separately) has a telephone-type modular plug, with an ef-  
fective strain relief, to connect to the microphone and a  
PJ-068 plug on the equipment end for connection to most  
aircraft radios. This cable can be instantly changed or re-  
placed without soldering.  
Simple easy-to-use continuous-tone dialing  
Screwdriver accessible DTMF level adjustment, inde-  
pendent of microphone gain setting  
Low sensitivity to hum and rf interference  
Rugged Million-Cycle PlusTM 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  
The 888TT is ergonomically designed; it fits naturally  
and comfortably in the hand and is not affected by heat or  
Rugged and dependable under all operating condi-  
tions  
E1998, Shure Brothers Incorporated  
Printed in U.S.A.  
27A3041 (RL)  
 
Microphoneconnectorwiringisshowninthetablebelow.  
Microphone Connector Wiring  
Pin Color Function  
Pin Color Function  
1
N.C.  
5
6
Black PTT  
Switch  
DTMF LEVEL  
ADJUST (C)  
Ground  
2
White Dc Bias (+),  
Audio Out  
Red  
Audio Out  
(Ac  
MICROPHONE  
SENSITIVITY  
ADJUST (B)  
coupled)  
3
4
Yellow PTT Switch  
7
8
Drain Ground  
N.C.  
Blue  
NC  
CABLE  
RELEASE (A)  
MICROPHONE CASE BACK  
The ALM-88 cable is wired at the microphone connector  
as shown in Figure 3 at the bottom of the page.  
FIGURE 4  
2. DTMF output: Press and hold the push-to-talk button.  
Depress and hold down a keypad button for a continu-  
ous tone. Adjust the DTMF output control (case back,  
hole “C” in Figure 4) as required.  
ADJUSTMENTS  
Operation of microphone and DTMF functions requires  
thatthe888TTbeconnectedtothecommunicationsequip-  
ment and that the equipment power is turned on.  
OPERATION  
Voice Transmission  
1. Hold the microphone comfortably in the hand posi-  
tioned so that the Top-Talk Sound ChannelsTM at the  
top of the case are near the mouth. The clearest sound  
is often obtained with the microphone at the corner of  
the mouth, with the cable away from the face.  
2. Depress the push-to-talk button and make sure the  
equipment is in the transmit mode before speaking.  
Dialing  
After connection to the communications set, turn the  
equipment power On. Power application can be verified by  
pressing the push-to-talk switch and observing the keypad  
LED backlighting.  
Factory preset microphone audio and DTMF levels are  
correct for aircraft radios with standard input circuits (as  
defined in RTCA DO-170), and level adjustment should not  
ordinarily be necessary. When such adjustment is neces-  
sary, it should be performed only by Shure Brothers Inc. or  
by an FAA Approved Service Facility. Use the supplied  
screwdriver to adjust the microphone sensitivity and DTMF  
output levels as follows:  
1. Press and hold the push-to-talk button.  
2. Press the desired keypad buttons in sequence. A high-  
pitched tone will confirm that the code has been trans-  
mitted. (The microphone audio is muted during DTMF  
tone transmission.)  
REPLACEMENT PARTS  
Modular plug-cable with PJ-068 plug assembly . . ALM-88  
1. Microphone sensitivity: Press the push-to-talk but-  
ton and speak normally into the microphone while  
checking transmitter modulation. Adjust the micro-  
phone sensitivity control (case back, hole “B” in Figure  
4) and repeat the talk test as required.  
FURNISHED ACCESSORY  
Screwdriver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65A1587  
OPTIONAL ACCESSORY  
Mounting Bracket (3 in kit) . . . . . . . . . . . . . . . . . . RK6MB  
SLEEVE (GROUND)  
RED  
RED  
NC  
NC  
RING (AUDIO)  
TIP (PTT)  
WHITE  
WHITE  
PJ-068 CONNECTOR (TO RADIO)  
RJ11 CONNECTOR (TO MICROPHONE)  
MODULINK CABLE WIRING  
FIGURE 3  
3
 
ENVIRONMENTAL QUALIFICATION FORM, TSO-C58a  
DO-160C  
DO-170  
PARA. #  
CONDITIONS  
DESCRIPTION OF TESTS  
PARA. #  
3.1.1  
3.1.2  
Ground Survival Low Tempera-  
ture and Operating Low Tem-  
perature  
Ground Survival High Temper-  
ature and Short-Time Operat-  
ing High Temperature  
4.5.1  
Microphone tested to Category D1  
Microphone tested to Category D1  
Microphone tested to Category D1  
4.5.2  
Operating High Temperature  
Altitude  
4.5.3  
4.6.1  
3.1.3  
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  
3.1.5  
Decompression  
Overpressure  
4.6.2  
4.6.3  
5.3  
Microphone tested at altitude equivalent to  
15,200 m (50,000 ft)  
Microphone tested at pressure = 170 kPa; equiv-  
alent altitude = –15,000 ft  
2.11 & Temperature Variation – Pre-  
Microphone tested to Category B for two cycles.  
3.2  
3.3  
3.5  
amplifier  
Humidity  
Vibration  
6.3.1  
8.5  
Microphone tested to Category A for 2 cycles.  
Microphone tested to Categories N, B, & M  
(Table 8-1, Not on Vibration Isolators)**  
3.6  
Magnetic Effect  
15.3  
Microphone tested to Equipment Class Z; no  
magnetic properties  
3.7  
3.8.1  
3.9  
Voltage Spike Conducted  
Induced Signal Susceptibility*  
Radiated rf Susceptibility*[  
Emission of rf Energy*  
Final Distortion  
17.3  
19.3  
Microphone tested to Category A  
Microphone tested to Category Z  
Microphone tested to Category A  
Microphone tested to Category Z  
20.5[  
21.4  
3.10  
3.11  
After all required environmental tests micro-  
phone meets requirements of DO-170, 2.2  
3.12  
Push-To-Talk Switch Life  
Fire Retardance  
After all required environmental tests micro-  
phone meets requirements of DO-170, Appendix  
B, T-7 and 2.9  
In accordance with FAR 25; 25.869(a)(4) and  
Appendix F, Part I (a)(3)(b)***  
*Tests performed at Radiometrics Midwest Corporation,  
Lombard, IL  
***Tests performed at Gaynes Test Laboratories,  
Chicago, IL  
[ Tested to DO-160B  
All other tests performed at Shure Brothers Inc.,  
Evanston, IL  
**Tests performed at Elite Electronic Engineering,  
Downers Grove, IL  
INFORMATION TO USERS  
This equipment has been tested and found to comply with the to radio or television reception, which can be determined by turning  
the equipment off and on, the user is encouraged to try to correct  
the interference by one or more of the following measures:  
limits for a Class B digital device pursuant to Part 15 of the FCC  
Rules. These limits are designed to provide reasonable protection  
againstharmful interference in a residential installation. This equip-  
ment generates, uses, and can radiate radio frequency energy,  
and, if not installed and used in accordance with the instructions,  
Reorient or relocate the receiving antenna.  
Increase the separation between the microphone and receiver.  
Connect the microphone transmitter into an outlet on a circuit dif-  
may cause harmful interference to radio communications. Howev- ferent from that to which the receiver is connected.  
er, there is no guarantee that interference will not occur in a particu-  
Consult the dealer or an experienced radio/TV technician for  
lar installation. If this equipment does cause harmful interference help.  
4
 

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