MIL-DTL-22442/1C(AS)
b. DC winding resistance: Primary less than 100 ohms.
Secondary less than 10 ohms.
c. Power rating: 13.4 volts AC RMS applied to primary under load conditions.
M22442/l-8 impedance matching transformer
a. The secondary winding shall be 16 ohms with a center tap.
b. Input matching impedance: 4000 ohms + 15% at 1000 Hz with each side of secondary
terminated in an 8.0 ohm resistive load and rated input voltage.
c. DC winding resistance: Primary less than 150 ohms.
Secondary less than 10 ohms.
d. Power rating: 6.0 volts AC RMS applied to primary under load conditions.
4. Impedance matching transformers. Impedance matching transformers furnished as part of a
cable assembly under this specification shall have primary and secondary windings which are
electrically isolated from each other and shall, as a minimum, meet the following requirements
under ambient and during environmental conditions. Except during measurement of the dc
winding resistance, the secondary winding of the transformer shall be terminated with a non-
inductive, high precision (+ 1%) resistive load equivalent to the nominal load impedance, and the
rated input voltage specified in the specification sheet shall be applied to the primary winding of
the transformer.
5. Transformer efficiency. The efficiency of the transformer shall be defined as the ratio of
the output power to the input power (Pout/Pin)*l00%. The efficiency of the impedance matching
transformer shall be at least 56 percent at 1000 Hz, which is equivalent to a maximum power loss
of 2.5 dB.
6. Transformer input matching impedance. The nominal input matching impedance of the
transformer shall be as specified.
7. Transformer distortion. The total harmonic distortion (THD) of the transformer shall be
less than 15% between 300 Hz to 1000 Hz and less than 5.0 % between 1000 to 3000 Hz.
8. Transformer dc winding resistance. The maximum dc resistance shall be as specified.
9. Transformer output. With the appropriate input signal at l KHz, the output signal shall
meet the power ratings as specified for the transformer.
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