QUANZHOU WOUXUN ELECTRONICS CO., LTD
Model: KG-619
Version: KG-619-0806-V1
Page 11 of 31
Circuit
Circuit
Circuit
Circuit
Description
Description
Description
Description
The frequency that using by this transceiver is generated by Q306 when in transmitting
mode, and generated by Q307 when in receiving mode.
To control the oscillating frequency via transmitting the VCO control voltage to variable
Diode(it is D302 and D303 when in transmitting mode, and it is D304 and D305 when in
receiving mode) which getted from phase comparators.
It will switch on Q308 when in receiving and when in transmitting, it will switch on Q305.
The output of the Q306 and Q307 will be amplified by Q302, Q303, and through
receive/transmit switch(D401/D402) to transmit to receive mixer Q408 and transmit RF
amplifier Q202.
(6)
(6)
(6)
(6)
The
The
The
The
description
description
description
description
of
of
of
of
s
s
s
s
peaker
peaker
peaker
peaker
signal
signal
signal
signal
process
process
process
process
The signal comes from the speaker will pass through IC404. When encoding the DTMF,
CPU will turn off the speaker input signal by D414, Q424.
This signal will adjust the maximum frequency deviation through audio processor(IC404),
then transmit to VCO modulation input.
