Figure 6-10. Terminal impedance test for transmit 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-

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

(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