Miteq D-9301, Руководство по эксплуатации и обслуживанию, Страница: 46 / 86

4-12
4.3.2.3 1170 MHz Phase Lock Source (A3A6)
Part Number: DPLO-5-1170-20P-XXXXX
Alternate Part Number: 115162-1170-XXXXX
The phase lock source consists of:
1. Fundamental VTO (1170 MHz)
2. Frequency divider (÷234)
3. Phase detector
4. Phase lock alarm circuit
A functional block diagram is shown in Figure 4-2.
A sample of the VTO is directed through the frequency divider and
then to the phase detector. The input reference frequency is
also fed to the phase detector. When the input reference
frequency and divided VTO frequency differ only in phase, the
phase detector output is a DC voltage proportional to the phase
difference between these two signals. A frequency difference
between the two signals results in a sweep voltage which is
applied to the voltage-tuned capacitor of the VTO. As the VTO is
being swept through its frequency range, comparison of frequency
is made in the phase detector. When the divided VTO frequency is
at the same frequency as the input reference, the sweep is
disabled and the VTO is locked to the input reference.
The specifications for the phase lock source are:
A. Frequency Output: 1170 MHz
B. Frequency Input: 5 MHz
C. Power Output: +12 dBm nominal
D. Power Input: 0±3 dBm
E. DC Power: +20V at 300 mA, +5V at 500 mA
F. Phase Voltage TP: 10 ±2V "in-lock", +1 or +19V
"out-of-lock"
G. Connectors -
1. RF: SMA female
2. DC: Solder filter
A fixed attenuator (A3A7) follows the phase lock source and is
used to provide level adjustment.