Figure 2. M and N Divider Waveforms for Test Points 5 and 6
Figure 3. M and N Divider Waveforms for Test Points 1 and 2
The output of the IF Amplifier at
U18
Pin 3 is at ECL logic levels: -0.9 V = high,
-1.7 V = low. Typical voltage levels for Q3 and Q4 are shown in Table 1.
Table 1. IF Amplifier Voltage Levels
Voltage Levels
Q3 Q4
Emitter -5.6 -7.4
Base
-4.8 -6.6
Collector
0
-1.9
A7A3
5