MIL-PRF-27/307A
Moisture resistance: MIL-STD-202, method 106, 100 Vdc polarizing voltage; subcycles 7A and 7B are
not applicable.
Shock (specified pulse): MIL-STD-202, method 213, test condition I.
Electrical characteristics:
Harmonic distortion: Not more than .5% at +7 dBm at l kHz.
Line winding impedance (1-2): 600 ohms +10%.
Four wire winding impedance (6-7): 600 ohms +10%.
Balance winding impedance (3-4): 600 ohms +10%.
DC resistance:
(1-2): 23 ohms +15%.
(3-4): 23 ohms +15%.
(6-7): 47 ohms +15%.
Frequency response: 300 Hz to 4000 Hz, flat within +0.3 dB, reference frequency l kHz using test
circuit shown on figure 2.
Insertion loss: 5 +1 dB with 1 Vrms at 1 kHz applied across (3-5) with (3-4) and (1-2) connected in
series.
Polarity: Additive, with terminals 1 and 4 and 2 and 6 connected together.
Transhybrid loss: 40 dB minimum when tested in accordance with figure 2 and as follows:
(NOTE: Two transformers are required to perform this test.)
a. Adjust RD for a loop current of 100 mA.
b. Adjust oscillator for EM = .775 volts at 1000 Hz.
c. Adjust R1 for EL minimum.
E6-7 ((T1))
d. Compute transhybrid loss = 20Log
E L (T 2)
Longitudinal balance: 40 dB minimum when tested in accordance with figure 3 and as follows:
a. Replace all equipment to the left of EM with a 600-ohm resistor.
b. Adjust oscillator for EM = .775 volts at 1000 Hz.
EM
≥ 60dB
c. Adjust C3 and C4 for ratio 20Log
EL
d.
Replace 600-ohm resistor with the rest of the test circuit as shown on figure 3.
Readjust oscillator for EM = .775 volts.
e.
f.
Adjust RD for loop current of 100 mA dc.
g.
Adjust R4 to 600 ohms.
EM
h. Compute longitudinal balance = 20Log
EL
5
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