
RPV516/RPU416 Circuit Description
- 7 -
3) TTS encoder
The necessary signal for TTS encoding is generated by IC403. The signal is sent to IC500 (1/2), and
then applied to 3KHz low-pass filter (Q501 and Q502). The resulting signal is applied to VCO for direct
modulation (See fig. 6).
VCO
D5.Q4
VR500
BALANCE
VR501
MAX
DEV
X1.IC1
PEFERENCE
OSC
CTCSS/CDCSS
TO
TTS
TTS
MUTE
Q503
SW
MIC
IC500(1/2)
MIC
AMP
PREEMPHASIS
IC500(1/2)
IDC
Q501.502
LPF
(SPATTER FILTER)
IC403
Fig. 6. Transmit audio CTCSS/CDCSS
4-a) RF amplifier (RPV516)
The RF signal obtained from the VCO buffer amplifier Q100 is amplified by Q101 and Q102. This
amplified signal is passed to the power amplifier, Q102 and Q105, which consists of a 2-stage FET
amplifier and is capable of producing up to 4.5W of RF power (See Fig. 7-a).
Fig. 7-a. APC system
4-b) RF amplifier (RPU416)
The RF signal obtained from the VCO buffer amplifier Q100 is amplified by Q101 and Q102. This
amplified signal is passed to the power amplifier, Q105 and Q107, which consists of a 2-stage FET
amplifier and is capable of producing up to 4W of RF power (See Fig. 7-b)
D
C
B
A
Title
Number
Revision
Size
AMP
Q101
5T
DRIVE AMP
Q102
FINAL AMP
Q105
ANT SW
D101
LPF
ANT
ANT SW
D102.103
RX
Q106
SW
Q109
SW
5T
IC100
APC
DET
Q103.Q104
B SW
B
APC
5T
TH100
SW
Q107
5T
Q108
SW
Содержание RPU416
Страница 2: ......
Страница 21: ...RPV516 RPU416 Exploded View 19 Exploded View ...