Voltage Controlled Oscillators; Receive Vco - Motorola MSF 5000 Instruction Manual

MSF
5000
Instruction Manual
Chapter 1 Description
Voltage Controlled Oscillators
Voltage Controlled Oscillators
The receive and transmit Voltage Controlled Oscillators
(VCO) are
mounted in
separate
cavities
within
the
RF
Tray,
as
shown in Figure
1-29.
RECEIVE
VCO
TRANSMIT VCO
0462
1
1
POWER
N
CONTROL
1
.
CIRCUITS
N
1
1
PWR
GUT
BACK
®
N
RECEIVER SYNTHESIZER
TRANSMITTER SYNTHESIZER
CIRCUITS CIRCUITS
N
I
1
I
Rasa
bf
AGG
THRESHOLD CONTROL
POWER
SET
COMP
ADJ
(F AMPLIFIER
&
DETECTOR CIRCUITS
METERING METERING
MSFI051
022294JNM
Figure
1-29
Receive and Transmit VCOs
Receive VCO
The Receive
VCO
produces
the
receiver injection frequencies. The steering line
voltage of
the
transmit reference circuit determines the
VCO
operating frequency
within
a
given
sub-band.
Two frequency sub-bands
are
provided via
a
bandshift
switch circuit within
the
VCO.
Figure
1-30
shows
a
block diagram of
the
Receive
VCO.
68P81092E02
3/19/94
1-59
wv
MSF
5000
Instruction Manual
Chapter 1
Description
Voltage Controlled Oscillators
Voltage Controlled Oscillators
The receive and transmit Voltage Controlled Oscillators
(VCO)
are
mounted in
separate
cavities within
the
RF
Tray,
as
shown in Figure
1-29
RECEIVE VCO TRANSMIT VCO
0462
PWR
GUT
BACK
POWER
CONTROL
®
CIRCUITS
RECEIVER SYNTHESIZER TRANSMITTER SYNTHESIZER
CIRCUITS CIRCUITS
RESHOLD CONTROL
POWER SET
COMP
ADJ
RSSB
METERING METERING
022294JNM
Figure
1-29
Receive and Transmit VCOs
Receive VCO
The Receive
VCO
produces
the
receiver injection frequencies. The steering line
voltage of the transmit reference circuit determines the
VCO
operating frequency
wit hin
a
given
sub-band. Two frequency sub-bands
are
provided via
a
bandshift
switch circuit within
the
VCO.
Figure
1-30 shows a block diagram of the
Receive
VCO
68P81092E02 3/19/94
1
-59