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RP3000 Circuit Description
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Circuit Description
1. Power Supply
Power supply of the radio is derived from the battery, which supplies battery B+ after passing
through fuse 3A and then feeds through power switch. The power supplies voltage for three AVRs.
IC505 supplies 5V (5M) voltage for the control circuit. IC9 supplies 5V (5C) voltage for the shared
circuit. And IC6 supplies voltage for the transmit/receive circuit. In transmit mode, 5TC becomes low
voltage and Q3 is turned on to supply 5V(5T) voltage for the transmit circuit. In receive mode, 5RC
becomes low voltage and Q2 is turned on to supply 5V (5R) voltage for the receive circuit.
BATT
FUSE
PROTECT
5C
5M
BUFF
1/2BIAS
AVR
AVR
SW
5R
5T
AVR
SW
SW
SAVE
5RC
5TC
Fig. 1 Power Supply Block Diagram
2. PLL Frequency Synthesizer
PLL circuit generates the first local oscillator signal for reception and RF signal for
transmission.
CPU
Q416
UL
X401
IC400
PLL
IC500
CV
CLK,DAT,EN
TCXO
VCO
BUFF
SW
MB
D100
T/R
To Drive Amp
BUFF
D103
SW
To Mixer
Q310
Fig2. PLL circuit
Содержание RP3000
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