4.3
PLL Frequency Synthesizer
The frequency synthesizer consists of VCO, TCXO
X1001
, and the custom IC
Q1046
(
RODINIA
). The
output frequency from TCXO
X1001
is 19.2 MHz and the tolerance is ±1.5 ppm in the temperature
range –22 °F to +140 °F (–30 °C to +60 °C).
VCO (Voltage Controlled Oscillator)
The VCO
Q1036
(
BFR460L3
) generates a between 806-940 MHz. The output from VCO
Q1036
(
BFR460L3
) is amplified by buffer amplifier
Q1041
(
2SC5010
) and then is supplied to the custom IC
Q1046
(
RODINIA
). The VCO frequency is divided into two by the dividing section of the custom IC
Q1046
(
RODINIA
) in order to become a true receiving or transmitting frequency. In the reception, the
RF signal convert a Base Band signal by mixing with the divided VCO signal, and then supplied to the
demodulator section of the custom IC
Q1046
(
RODINIA
), described previously. In the transmission, the
divide VCO frequency is modulated to the FM (or digital) in the custom IC
Q1046
(
RODINIA
), and then
is supplied to the transmitter section described previously.
Varactor Control Voltage
The tuning voltage (VCV) of the VCO establishes the lock range of VCO by controlling the cathode of
varactor diode
D1029
,
D1030
,
D1031
and
D1032
(all
1SV279
) from the custom IC
Q1046
(
RODINIA
).
PLL
The main constitution product of the PLL is equipped all with in the custom IC
Q1046
(
RODINIA
), so
that all pro- cessing regarding the frequency control is performed in the custom IC
Q1046
(
RODINIA
).
MN006437A01-AB
Chapter 4: Circuit Description
14
Содержание EVX S24
Страница 9: ...3 2 Block Diagram FR028210D MN006437A01 AB Chapter 3 Exploded View and Miscellaneous Parts 9 ...
Страница 10: ...MN006437A01 AB Chapter 3 Exploded View and Miscellaneous Parts 10 ...
Страница 12: ...MN006437A01 AB Chapter 3 Exploded View and Miscellaneous Parts 12 ...
Страница 29: ...Chapter 6 Main Unit FR028210D Figure 1 Circuit Diagram RF Section MN006437A01 AB Main Unit FR028210D 29 ...
Страница 30: ...Figure 2 Circuit Diagram CONTROL Section MN006437A01 AB Chapter 6 Main Unit FR028210D 30 ...
Страница 31: ...Figure 3 Parts Layout Side A 1 3 5 2 4 6 A C B D MN006437A01 AB Chapter 6 Main Unit FR028210D 31 ...
Страница 32: ...Figure 4 Parts Layout Side B a c b d 1 3 5 2 4 6 MN006437A01 AB Chapter 6 Main Unit FR028210D 32 ...
Страница 45: ...Chapter 7 Display Unit FR028310A MN006437A01 AB Display Unit FR028310A 45 ...
Страница 46: ...Figure 5 Display Unit FR028310A MN006437A01 AB Chapter 7 Display Unit FR028310A 46 ...
Страница 47: ...Figure 6 Parts Layout Side A 1 3 2 A C B D 4 MN006437A01 AB Chapter 7 Display Unit FR028310A 47 ...
Страница 48: ...Figure 7 Parts Layout Side B 1 3 2 a c b d 4 MN006437A01 AB Chapter 7 Display Unit FR028310A 48 ...