MIL-DTL-22442/1C(AS)
APPLICABLE DOCUMENTS:
Non-Government Publications. The following documents forms a part of this specification to the
extent specified herein. Unless otherwise specified, the issues of the documents which are DOD
adopted shall be those listed in the issue of the DoDISS specified in the solicitation. Unless
otherwise specified, the issues of documents not listed in the DoDISS are the issues of the
documents cited in the solicitations (see 6.3).
AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)
ASTM-D4673
-
Standard Classification System for Acrylonitrile-Butadiene-
Styrene (ABS) Plastics and Alloys Molding and Extrusion
Materials (DoD adopted)
(Application for copies should be addressed to the American Society for Testing and Materials,
1916 Race Street, Philadelphia, Pa 19103-1187.)
REQUIREMENTS:
l. The switch assembly may contain a microphone amplifier, microphone keying switch,
earphone matching transformer and terminal block, or any combination of, as specified in the
applicable specification sheet.
* 2. The switch housing and terminal block shall be molded from molding plastic conforming
to ASTM-D4673, ABS 121, black or equivalent (as approved by the procuring activity).
3. Impedance matching transformers shall have the following characteristics:
M22442/l-3 impedance matching transformer
a. Input matching impedance: 600 ohms ± 15% at 1000 Hz with a 7.5 ohm resistive load
and rated input voltage.
b. DC winding resistance: Primary less than 100 ohms.
Secondary less the 10 ohms.
c. Power rating: 13.4 volts AC RMS applied to primary under load conditions results in
1.3 + .2 volts AC RMS output.
M22442/l-7 impedance matching transformer
a. Input matching impedance: 600 ohms + 15% at 1000 Hz with a 15.0 ohm resistive and
rating input voltage.
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