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DESKTOP PAGING MICROPHONE
FEATURES
•
D
esigned for clear and precise speech
•
Push-to-talk switch
•
Lock-on switch for hands-free operation
Dynamic microphone element
•
•
Cardioid polar pattern with noise cancellation
•
Priority paging
•
Low impedance
Compact die cast base
•
J.W. Davis & Company
Sales 800-527-5705 • Sales Fax 800-388-9106 • Corp 214-651-7341 • Corp Fax 214-939-0328 • www.jwd.com • jwd@jwd.com
J. W. Davis DM-1A
NEW TECHNOLOGY
DESCRIPTION
The DM-1A is specifically engineered for
paging, dispatching and radio applications.
The balanced, dynamic microphone element
provides a unidirectional, cardioid pattern with
noise cancellation that permits clear voice
reproduction in noisy environments and affords
maximum gain before feedback. Low imped-
ance allows a longer cable run from the micro-
phone to the amplifier without encountering
interference. Push-to-talk and hands-free,
lock-on switches provide operational adaptabil-
ity. A flexible 9.8'
cable is attached.
OLD RELIABILITY
3030 Canton Street • P.O. Box 710219 • Dallas, Texas 75371-0219
four-conductor, shielded
090301141
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Summary of Contents for J.W. Davis DM-1A
- Page 1 DESKTOP PAGING MICROPHONE J. W. Davis DM-1A FEATURES DESCRIPTION • esigned for clear and precise speech The DM-1A is specifically engineered for paging, dispatching and radio applications. • Push-to-talk switch The balanced, dynamic microphone element provides a unidirectional, cardioid pattern with •...
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Page 2: Frequency Response
ARCHITECT’S AND ENGINEER’S SPECIFICATIONS The dynamic desktop microphone shall be a J.W. Davis DM-1A or equivalent having a cardioid polar response pattern with noise canceling and a frequency response of 100 Hz to 12,000 Hz. The impedance of the unit shall be 600 ohms with a sensitivity of - 72 dB (ref dB = 1V/ mBar).