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Figure 6-9. Impulse noise test.
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TM-11-5895-1012-10 Technical Control Facility (General) Manual
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Figure 6-11. Terminal impedance test for receive circuit.
TM 11-5895-1012-10
Figure 6-10. Terminal impedance test for transmit circuit.
V2=
receiving station voltage terminated in 600 ohms
ure 6-11 and set the transmission test set as follows:
(4) Performance Standard. The permissable ter-
(a) Jumpered as shown in figure 6-11.
minal impedance is 600 ohms 10%.
(b) Patch panel impedance selectors at 600
d. In-Station Test. In-station testing is accom-
plished in the same manner as station to station test-
(c) Patch panel frequency selector at less than 5
ing except the local station acts as both transmitter
(d) Voltmeter function switch to on.
(2) Transmitting Circuit. If the local station is to
6-13. Harmonic Distortion Test (fig. 6-12)
act as transmitter, prepare the transmitting circuit
shown in figure 6-11 and set the transmission test set
as follows:
(a) Jumpered as shown in figure 6-11.
(b) Patch panel input impedance selector at
(c) Patch panel frequency selector at less than 5
(d) Voltmeter function switch to on.
measures the signal frequency and each
(3) Procedure. The receiving station will calibrate
separately and then gives a mathematical
set for 1000 Hz and set it for 1
for computing the total harmonic distortion.
o n the transmitting station volt-
b. Test Equipment. The following test equi
required to perform this test:
(1) Transmission Test Set.
(2) Frequency Selective Voltmeter.
(3) Terminating plugs (600 ohms) and patch
c. Station-to-Station Test. Contact distant
and arrange for one station to act as transmitter and
one as receiver. Perform the procedure below and the
reverse roles and repeat the procedure.
V1=
receiving station open circuit voltage
(1) Transmitting Circuit. If the local station is to

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