Shure Microphone undirectional condensor microphone User Manual

MODEL SM98  
UNIDIRECTIONAL CONDENSER MICROPHONE  
podium, table, or desk; A98HA, a hanging adapter permit-  
ting the microphone to be suspended from above; and  
A98PF, a pop filter and locking collar kit, allowing the  
SM98 to be used for speech or vocal pickup.  
Features:  
Smooth wide response for accurate sound reproduc-  
tion across the entire audio spectrum  
Symmetrical cardioid pattern, uniform with frequency  
out to 20 kHz, maximizes gain before feedback, mini-  
mizes need for isolation when picking up single instru-  
ments out of a group  
Switch-selectable 12 dB/octave low-frequency cutoff  
permits tailoring response to suit particular instru-  
ments or room conditions  
GENERAL  
Very high SPL capability  
The SM98 is a miniature electret condenser microphone  
with a unidirectional (cardioid) pickup pattern. A smooth  
wide frequency response from 40 to 20,000 Hz allows the  
microphone to be extremely well adapted to pick up all  
kinds of musical instruments. A detachable 4.6m (15 ft)  
cable with Switchcraft Tini Q.G. connectors and a battery  
or simplex (phantom) powered preamplifier are supplied  
with the microphone. A windscreen is provided for out-  
door use, and a swivel adapter is supplied for conventional  
microphone stand or goose neck mounting.  
The unidirectional pattern of the SM98 discriminates  
against sounds coming from the rear, permitting higher  
gain before feedback in sound reinforcement applica-  
tions. Because of its uniform cardioid pattern extending  
out to 20,000 Hz, the microphone can be used for pickup of  
a particular instrument in an ensemble or orchestra, min-  
imizing the need for isolation booths or barriers. A very  
high maximum sound pressure level allows use of the  
SM98 with all acoustic instruments including drum kits  
and other percussion as well as brass, reed, wind, string,  
and keyboard instruments. The SM98 can also be used  
with amplified guitars and keyboards.  
Very low distortion and high output clipping level  
Battery or simplex (phantom) powering: uses standard  
9-volt alkaline batteries; accepts wide range of simplex  
voltages, from 11 to 52 Vdc  
Low susceptibility to RFI, electrostatic and electro-  
magnetic hum  
Rugged construction of microphone and preamplifier  
for outstanding reliability  
Detachable cable at both microphone and preamplifier  
Usable over very wide range of temperature and  
humidity  
Supplied with unique swivel adapter for mounting on  
conventional microphone stands or goosenecks  
Optional accessories to increase microphone’s versa-  
tility include: A98MK, Drum Kit; A98-G18, Gooseneck  
Adapter; A98HA, Hanging Adapter; A98PF, Pop Filter  
The low-distortion, high-clipping-level preamplifier  
provides switch-selectable Flat or Low-Cut response to  
suit pickup characteristics needed for various instru-  
ments. The Low-Cut position is also useful when it is  
necessary to filter out low-frequency noise from such  
sources as wind noise or air conditioning equipment.  
The SM98 is powered either by two readily available  
9-volt alkaline batteries (300 hours continuous battery  
life) or by an 11-to-52 Vdc simplex (phantom) supply from  
sound reinforcement, recording or broadcast equipment.  
The preamp is designed so that the battery supply will  
automatically switch in should the simplex power fail.  
However, no battery drain will occur as long as the simplex  
voltage exceeds the battery voltage.  
SPECIFICATIONS:  
Type  
Cardioid condenser (electret bias)  
Frequency Response  
40 to 20,000 Hz (see Figure 1)  
A series of optional accessories is available designed  
exclusively for use with the SM98. These include the fol-  
lowing: A98MK Drum Kit, a gooseneck holder for mount-  
ing the microphone directly on most drums; A98-G18, an  
18-inch gooseneck for mounting the microphone on a  
222 HARTREY AVENUE, EVANSTON, ILLINOIS 60202-3696 U.S.A. • PHONE (312) 866-2200 • TELEX 4330191 • FAX (312) 866-2279  
Copyright 1987, Shure Brothers Inc.  
27A2173(GJ)  
Printed in U.S.A.  
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Battery On/Off Switch: Move to On to power from bat-  
teries or to use batteries as backup power in case of  
interruption to external power supply (no battery drain  
occurs as long as simplex voltage source is greater than  
battery voltage). Move to Off to prevent battery drain  
when unit is not in use  
Polar Pattern  
Unidirectional (cardioid), uniform with frequency,  
symmetrical about axis (see Figure 2)  
LED Indicator: Green LED flashes momentarily when  
switch is moved to On to indicate at least 8 hours of  
battery life remaining  
Flat/Lo Cut Switch: In Lo Cut position, 12 dB/octave  
rolloff below 80 Hz (see Figure 1)  
Cable  
4.6m (15 ft) two-conductor shielded, small diameter,  
interconnecting cable with 3-socket miniature Switch-  
craft Tini Q.G. connector on each end to mate with  
microphone output connector and preamplifier input  
connector  
TYPICAL POLAR PATTERN  
FIGURE  
2
Output Impedance  
Rated at 150 ohms (90 ohms actual)  
Case  
Microphone: Matte black enamel brass case and stain-  
less steel inner grille  
Preamplifier: Matte black enamel die-casting  
Recommended minimum load impedance: 800 ohms  
(May be used with loads as low as 150 ohms with  
reduced clipping level)  
Dimensions  
See Figure 3  
Output Level (at 1,000 Hz)  
Open Circuit Voltage . . . . . . . . . . . . . -80.0 dB (0.10 mV)  
0 dB = 1V/µbar  
Preamplifier Output Clipping Level (at 1,000 Hz, less than  
0.1% THD)  
800 ohm load . . . . . . . . . . . . . . . . . . . . . . . . . 0 dBV (1.0V)  
150 ohm load . . . . . . . . . . . . . . . . . . . . . . -13 dBV (0.22V)  
Maximum SPL (at 1,000 Hz)  
800 ohm load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 dB  
150 ohm load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 dB  
Hum Pickup  
-5 dB equivalent SPL in 1 m0e field (60 Hz)  
OVERALL DIMENSIONS  
FIGURE 3  
Output Noise  
34 dB SPL, A-weighted  
37 dB SPL, weighted per DIN 45 405  
Environmental Conditions  
-18° to 57° C (0° to 135° F)  
-29° to 74° C (-20° to 168° F)  
Operating Temperature:  
Storage Temperature:  
Signal-to-Noise Ratio  
64 dB re 94 dB SPL  
Relative Humidity (Operating or Storage):  
0 to 95%  
Dynamic Range  
121 dB  
Net Weight  
Microphone: 12 grams (0.4 oz) less cable  
Preamplifier: 435 grams (15.4 oz) less batteries  
Phasing  
Positive pressure on diaphragm produces positive  
voltage on pin 2 relative to pin 3 of preamplifier output  
connector  
Furnished Accessories  
Windscreen, Swivel Adapter  
USING THE SWIVEL ADAPTER  
Power  
To mount the SM98 in the supplied swivel adapter:  
1. Mount the adapter on a microphone stand.  
2. Loosen the thumbscrew at the top of the adapter.  
3. Attach the microphone to the connector.  
Battery: Two 9-Vdc alkaline (NEMA 1604A), approxi-  
mately 300 hours continuous with fresh alkaline  
batteries  
Simplex (Phantom) Voltage: 11 to 52 Vdc, operational  
down to 9 Vdc; 1.8 mA current drain; permissible to use  
simplex power with batteries in place or removed  
4. Slip the cable through the slot in the adapter. Slide the  
connector back through the hole until the protruding  
black cable-lock button is in the open slot and the  
microphone stops flush with the flat on the adapter.  
Switches and indicator  
Two recessed slide switches and green LED indicator  
on top surface of preamplifier assembly  
2
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POWERING THE SM98  
The SM98 can be powered by two internal 9-volt alkaline  
batteries or by an external simplex supply of 11 to 52 volts  
dc.  
To use batteries, move the Battery On/Off switch to On.  
The green LED will indicate at least 8 hours of battery life  
remaining by flashing once when the switch is moved to  
On. If the LED does not flash, the batteries should be  
replaced. A battery-powered SM98 preamplifier output  
can be connected to any balanced-line low-impedance  
input.  
To use simplex power, connect the preamplifier output  
to a balanced-line microphone input supplying 11 to 52  
Vdc simplex (phantom) power. The batteries may be left in  
place while the unit is externally powered. There will be no  
battery drain as long as the simplex voltage exceeds the  
battery voltage with the battery switch On, or if the battery  
switch is turned off.  
SWIVEL ADAPTER  
FIGURE 4  
OPTIONAL ACCESSORIES  
Drum Mounting Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . A98MK  
Gooseneck Adapter . . . . . . . . . . . . . . . . . . . . . A98-G18  
Hanging Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . A98HA  
Pop Filter and Locking Collar. . . . . . . . . . . . . . . . A98PF  
Making sure the thumbscrew will clamp on the silver  
metal segment of the connector, NOT ON THE BLACK  
PLASTIC PART, tighten the thumbscrew.  
CAUTION: Tightening the thumbscrew on the plastic  
section of the connector could damage the connector  
body.  
GUARANTEE  
This Shure product is guaranteed in normal use to be  
free from electrical and mechanical defects for a period of  
one year from date of purchase. Please retain proof of  
purchase date. This guarantee includes all parts and labor.  
This guarantee is in lieu of any and all other guarantees or  
warranties, express or implied, and there shall be no recov-  
ery for any consequential or incidental damages.  
Tilt the adapter to aim the microphone as desired.  
To remove the microphone without disturbing the  
swivel adapter and cable, reach into the open slot of the  
adapter and press the cable-lock button while disen-  
gaging the microphone.  
SHIPPING INSTRUCTIONS  
Carefully repack the unit, have it insured, and return it  
prepaid to: Shure Brothers Incorporated  
Attention: Service Department  
222 Hartrey Avenue  
Evanston, Illinois 60202-3696  
If outside the United States, return the unit to your dealer  
or Authorized Shure Service Center for repair. The unit  
will be returned to you prepaid.  
BATTERY INSTALLATION  
To install batteries, remove the two screws in the bottom  
corners of the preamplifier case. Lift off the case cover  
exposing the battery compartment. The use of 9-volt alka-  
line batteries (NEMA 1604A or equivalent) is highly  
recommended. Two batteries are required; always replace  
batteries in pairs.  
To prevent possible damage due to leakage, remove the  
batteries if the unit will not be used for a long period of  
time.  
INTERCONNECTING CABLE  
One 4.6m (15 ft) cable is supplied for connecting the  
SM98 Microphone to its preamplifier. To retain access to  
the switches located on the preamplifier, it is sometimes  
desirable for the units to be located a greater distance  
apart. Up to 15m (50 ft) of additional cable can be used  
between the SM98 Microphone and preamp with no loss in  
response or output.  
MICROPHONE CIRCUIT DIAGRAM  
FIGURE 5  
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PREAMPLIFIER CIRCUIT DIAGRAM  
PREAMPLIFIER PC BOARD  
FIGURE 6  
FIGURE 7  
REPLACEMENT PARTS LIST  
Reference  
Designation  
Part  
Number  
Commercial  
Alternate  
Description  
Printed Circuit Board Assembly  
Microphone Cartridge-Housing  
None  
90A8216  
R134  
A l  
None  
A2  
Capacitor, Electrolytic, 1 µF, 50 Wvdc  
Capacitor, Electrolytic, 33 µF, 16 Wvdc  
Capacitor, Electrolytic, 15 µF, 63 Wvdc  
Diode, Computer, 75V, 0.4A  
None  
86S628R  
86AE629  
86W628R  
C102, 107, 108, 110  
Mallory VTL33S25  
None  
C103  
C106  
TI, GE 1N4148  
None  
D101, 102, 103, 105, 106 86A415R  
86A8405  
86C429  
LED, Green  
D104  
D107  
Diode, Current Regulator, 1.3 mA  
Motorola, Teledyne  
1N5300  
Ferrite Bead Ring  
Stackpole 57-0180  
None  
80A253  
RK245  
L1, L2  
MP2  
Swivel Adapter  
None  
Windscreen  
49A66  
MP3  
Connector, Receptacle, 3-pin Miniature  
Connector, Receptacle, 3-pin  
Transistor, NPN  
Switchcraft TB3M  
Switchcraft D3M  
95A8077  
95A247  
86A350  
P1  
P2  
Motorola, National  
Semiconductor 2N5210  
Q101, 105  
Motorola, National  
Transistor, PNP  
Q102, 103, 104  
86A348  
Semiconductor 2N5087  
Slide Switch, SPDT  
Transformer  
None  
None  
None  
S101, 102  
55A8031  
51A286  
C107  
T1  
Cable and Connector Assembly  
W1  
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