PIN
NUMBER
PORT
NAME
DESCRIPTION
70 PLLSTB Outputs PLL strobe signal.
71 AFON
Outputs AF regulator (Q15, Q16)
control signal.
HIGH : While emitting audio
72 DUSE
Outputs LPF cut-off frequency control
signal to the CTCSS switch (Q38).
LOW : When CTCSS or no signal-
ing system is in use.
HIGH : DTCS is in use.
73–76 KR0–KR3 Input ports for keypad.
78 UNLK Input port for PLL unlock signal.
79 EMPHASIS
Outputs emphasis switch (Q73) con-
trol signal.
HIGH : During FM mode operation.
80 T5C
Outputs T5 regurator (Q22) control
signal.
LOW : While transmitting
81 DEGI_W
Outputs detect circuit (Wide/Narrow)
switch (Q53) control signal.
HIGH : During narrow mode operation.
82 R5C
Outputs R5 regulator (Q21) control
signal.
LOW : During receive
83 TXC
Outputs RF output power control
signal.
LOW : During transmit
86–90 KS0–KS4 Output ports for keypad.
92 PS5C
Outputs PS5 regulator (Q54) control
signal.
LOW : Power saved
97, 98 DICK, DIUD Input port for [VOL] control (S801).
141 TONE
Outputs DTMF, BEEP, 1750 Hz tone
signals, etc.
4-6-2 D/A CONVERTER (IC10)
PIN
NUMBER
PORT
NAME
DESCRIPTION
2T1
Outputs the tunable BPF tuning signal.
The output signal is applied to BPF (D9,
D11, D12).
3T2
Outputs the tunable BPF tuning signal.
The output signal is applied to BPF (D11,
D12).
10 T3
• Outputs the tunable BPF tuning signal.
The output signal is applied to BPF
(D65).
• Output port for transmit output power
setting signal. The output signal is
applied to the APC amplifier (IC3, pin 3).
11 VOLOUT
Outputs AF output signals to the AF ampli-
fier (IC5).
13 DTCS
Input port for DTCS signal from the DTCS
amplifi er (IC23).
1 5 FC Outputs reference frequency control voltage.
22 MOD
Outputs modulating audio signal to the
modulator circuit (D61).
23 SQLIN
Outputs squelch control signal to the noise
active filter (IC2, pins 7, 8; R86–R88,
C121, C122).
4 - 5
To Next Page
Loading...
Need help?
General
