MIL-T-27/3B
REQUIREMENTS: (When numbers in parentheses, such as (1-3) are used, they indicate the winding and the extreme terminals of the winding. When the extreme terminals of two windings are used, (4-9), the windings are connected in series, terminals 6 and 7 are connected.)
Electrical ratings:
Primary power level: +15 dBm, maximum; -8 dBm, minimum.
Working voltage
(1-3) - 175 V, maximum. (4-6) - 175 V, maximum. (7-9) - 175 V, maximum.
Primary current: .020 ampere dc through terminal 2; .001 ampere dc, maximum unbalance. Primary impedance (1-3): 10,000 ohms ct.
Design and construction:
Dimensions and configuration: See figure 1. Duty cycle: Continuous.
Case: Metal encased.
Material: Steel.
Terminals: Solder terminals, No 20 AWG.
Height: .312 inch, +.000, -.156 (7.92 mm +0.00 -3.96). Weight: .72 pound, maximum.
Terminal strength: MIL-STD-202, method 211, test condition A, 5.0 pounds. Operating temperature: 105·C, maximum.
Dielectric withstanding voltage: MIL-STD-202, method 301; test voltage at sea level, 500 V rms. At reduced barometric pressure, 300 V rms.
Electrical characteristics:
Harmonic distortion: Not more than 1 percent with 20 V, 300 Hz across (1-3) and .020 ampere dc through terminal 2.
No load (centertap voltage unbalance only): With 20 volts, 1,000 hertz across (1-3) and .020 dc through terminal 2:
Unbalance (4-5) and (5-6): 1 percent, maximum. Unbalance (7-8) and (8-9): 1 percent, maximum. Unbalance (4-6) and (7-9): 1 percent, maximum. Unbalance (1-2) and (2-3): 1 percent, maximum.
Secondary load impedance: (4-6) - 22,500 ohms ct.
(7-9) - 22,500 ohms ct ± 10 percent. (4-9) - 90,000 ohms ct.
Primary impedance (1-3): With approximately 1 V, 1,000 Hz across (1-3) and .020 ampere dc through terminal 2, and 90,000 ohms ct across (4-9), the primary impedance shall be 10,000 ohms ct ±10 percent across (1-3).
Frequency response: Range - 300 to 10,000 Hz at rated power, flat within ±2 dB; reference frequency = 1,000 Hz; test voltage 1 Vrms (1-3).
Insertion loss: 1.0 dB maximum, with 20 V, input at 1,000 Hz across (1-3). Resonance: Second resonant frequency = 20,000 Hz, minimum.
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