Radio Simulation Network

TM 11-5820-695-35

then amplified in emitter follower buffer amplifier Q5.

pcm signal 1RSPCM-1 to approximately the same

Resistors R21 and R22 determine the dc bias for Q5,

amplitude as the pcm/orderwire signal FRPCM. It

and R22 is also the emitter load resistor. The output

operates as a differential amplifier. Q4A conducts only

signal is coupled the radio simulation network.

when its base is more positive than the dc bias at the

base of Q4B; when this occurs, Q4B is cut off. Thus,

Radio Simulation Network. The first sect

the signal is sliced or rectified because Q4A conducts

tion of the radio simulation network, C9, R23 and R24

only on the positive polarity of the pcm signal. The gain

provides for simulation of the low frequency phase shift

is controlled by the dc level at the base of Q4B, which is

characteristics of the radio receiver and for part of the

derived from the 1RSPCM-1 signal as modified by a

attenuation. The signal is connected to the attenuation

feedback signal. This is explained in d, e, and below.

network, R25, R26

The output signal from emitter load resistor R20 is

coupled through a low pass filter, L7 and C8, which

eliminates frequencies above 60 kHz. The signal is

2-84.2

Chonge 1