Uniboard; Transmit Synthesizer Circuitry - Motorola MSF 5000 Instruction Manual

Chapter 1 Description
MSF
5000
Instruction Manual
Uniboard
Uniboard
The Uniboard is mounted in
the top
of
the
RF
Tray. It contains portions of four
major station circuits, including:
0
Transmit Synthesizer
Circuitry
Receive Synthesizer
Circuitry
Receiver
I-F Amplifier
Detector
Power Control Circuitry
Figure
1-25
shows
the top
view of
the
Uniboard with circuit location and
interconnect detail.
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INJ AMP
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(AF & OC)
W103
W106
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SYNTH
IPA
(WO)
Fiend
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Acx
$9730
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0
|
1
FRONT END
RECEIVER SYNTHESIZER
TRANSMITTER SYNTHESIZER
CIRCUITS
|
GONTROL
©
1
CIRCUITS
Fass
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OVERDRIVE
IF AMPLIFIER &
DETECTOR CIRCUITS
moat
raze,
ewes
"PWR
OTL
POWER
CIRCUITS
TR
PO
POWER SETUP
NOTE: Reference
Oscillator Circuits are found on
all
bands except for
900 MHz and bands with the External or High Stability Oscillator Option.
Figure 1-25
Uniboard
Circuit Location
Transmit Synthesizer Circuitry
1-52
The transmit and
receive synthesizer
are
of the same basic design.
The
major
difference is that the transmit synthesizer contains
a
modulation circuit
to
generate the transmit carrier signal.
The transmit synthesizer contains
a
Phase-Locked Loop
(PLL)
circuit which locks
the
output of
the Transmit
VCO.
The resultant frequency is
the reference for the
transmitter to produce the programmed transmit frequency. The Transmit
VCO
is
a separate assembly located
within
the
RF
Tray.
68P81092E02
3/19/94
XxMTR