2-3. Potential at points@ and@ becomes that shown
at a· b' c' and d' in the chart 10 and 11 . Phase differ
ences and output relations between pilot signal and
detection signal are as shown in the following chart 12.
Since points@and@ are connected to the differ
2-4.
ential amplifier, its operation creates the following
relations. Let the potential at@be E�\ at@, E� and
at @, E@. Then E@=K(E@ - E@). Furthermore
K>O. The output potential at e undergoes the change
shown in chart 12, also due to the phase difference bet
ween the pilot signal and detection signal
Tr3.
3. Oscillation Section and Phase Comparison Detection
Section
The output potential of the phase comparison detec
tion section is added to the base of Tr6 in the VCO,
so that by examining 1.b and 2-4 one can see that a
locked condition is possible only when the phase dif
ference is either 90° or 270°, and the following con
ditions hold:
a zone: VCO works for phase retard.
b zone: VCO works for phase advance.
c zone: VCO works for phase advance.
d zone: VCO works for phase retard.
Therefore the only stable, locked condition is 270°
phase difference (with a 90° difference, even a tiny
CHART 12
retard will cause an automatic shift to 270°).
Therefore, according to the charts in the Oscillator
Section discussions, what leads to stability are
nal output (chart 7), ® terminal output (chart 6),
CD terminal output (chart 3) and ® terminal output
(chart 2).
Even if a locked condition arises at 90° phase difference,
it will be due to(}) terminal output (chart
terminal output (chart 2), so that switching will not
be affected at all.
added to
j
PHASE
DIFFERENCE
Q)
Difference between pilot signal and
CT-7000
Q)t
ermi
and (fi)
3)
RENCE
terminal output signal.
CHART 13
1 1