Figure 79. Test setup for checking tuning unit 1 minor components.

Figure 79. Test setup for checking tuning unit 1 minor components.

c. Coupler, Radio Frequency Interfer-

cable of the signal generator and the 500-

e n c e CU-892/URM-85 (fig. 38 and 80).

ohm input impedance of the CU-892/URM-

Although the CU-892/URM-85 (fig. 80) is

85 may cause degradation of the signal.

designed for use with 500-ohm impedance

T h i s mismatch will result in a smaller

audio-signal or powerline two-wire net-

a m p l i t u d e indication, on the main unit

works, a comparative check of its oper-

panel meter and in the monitored

ating efficiency can be obtained by pro-

headset audio signal, than that obtained

ceeding in a similar manner to b above.

w i t h the CU-891/URM-85. Proceed as

follows :

The mismatch between the 50-ohm output

167