Kenwood Tk 860h Manual

21
TK-860G/862G
INSTALLATION
2. Accessory Terminal (TX-RX Unit)
2-1. External Connector Accessory Terminal Method
No. Name I/O Description Note
CN1 1 8C O DC 8V output
2 5S O DC 5V output
3 AUX5 O SMRD : Reset output *1
4 AUX6 O5SC : 5S control (Cannot use)*1
5 NC – Non-connection
6 AUX3 O SQ : Squelch detect output *2
7 AUX1 I PTT : External PTT input *2
8 AUX4 TXDTXD : Serial control data output*1
9 AUX2 RXDRXD : Serial control data input*1
I DTC : Data channel control/
External hook input
I CHDATA :...

22
TK-860G/862G
INSTALLATION
3-2. Modifying the Transceiver
Modify the transceiver as follows to turn the power or
the Horn Alert or Manual Relay function on and off with the
ignition key.
1. Remove the lower half of the transceiver case.
2. Set jumper resistors (0Ω) R134 and R135 of the TX-RX
unit (A/2) as shown in Table 1.
TX-RX UNIT
    (A/2)
ANT
KCT-19
CN2
R134R133
R135
Fig. 4
Operation when KCT-18 R134 R135
is connected
Enable Enable← KCT-18 cannot
Power on/off and HornDisable Enable     be...

23
TK-860G/862G
INSTALLATION
12
34
5
6
2. Fold the flat cable ( ) in the opposite direction ( ).
3. Rotate the control section ( ) 180 degrees ( ).
4. Insert the flat cable into the control section connector,
CN501 ( ).
5. Mount the control section on the transceiver ( ).
CN501
1
2
3
4
5
6
Fig. 7
6. External Speaker
6-1. KES-3 : Option
The KES-3 is an external speaker for the 3.5-mm-diam-
eter speaker jack.
•Connection procedure
1. Connect the KES-3 to the 3.5-mm-diameter speaker jack
on the rear of the...

24
TK-860G/862G
Frequency Configuration
The receiver utilizes double conversion.  The first IF is
49.95MHz and the second IF is 450kHz.  The first local oscil-
lator signal is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the neces-
sary frequencies.  Figure 1 shows the frequencies.
Fig. 1 Frequency configuration
Receiver System
The receiver is double conversion superheterodyne.  The
frequency configuration is shown in Figure 1.

Front-end RF Amplifier
An incoming signal...

25
TK-860G/862G

Wide/Narrow Changeover Circuit
The W/N port (pin 4) of the shift register (IC510) is used
to switch between ceramic filters.  When the W/N port is
high, Q4 turns on and the ceramic filter SW diode (D8, D10)
CF1 turns on to receive a Narrow signal.  At the same time,
Q35 turns on and one of the filters is selected so that the
wide and narrow audio output levels are equal.
When the W/N port is low, Q3 turns on and the ceramic
filter SW diode (D8, D10) CF2 turns on to receive a Wide...

26
TK-860G/862G
D102,104Q103
TX VCO
Q106
BUFF
AMP
D101,103Q101
RX VCO
Q102,
104,105
T/R SW Charge
pumpLPF
Phase
comparator
1/M
1/N
PLL/VCO
5kHz/6.25kHz
5kHz/6.25kHz
REF
OSC
16.8MHzPLL
D ATAIC3 : PLL IC
Q9
RF AMP
Fig. 6 PLL circuit

Unlock Circuit
During reception, the 8RC signal goes high, the 8TC sig-
nal goes low, and Q16 turns on.  Q18 turns on and a voltage
is applied to the collector (8R).  During transmission, the
8RC signal goes low, the 8TC signal goes high and Q29
turns on.  Q28 turns on and a...

27
TK-860G/862G

APC Circuit
The automatic transmission power control (APC) circuit
detects part of a power module output with a diode (D35,
D36) and applies a voltage to IC15.  IC15 compares the APC
control voltage (PC) generated by the D/A converter (IC6)
and DC amplifier (IC7) with the detection output voltage to
control Q31 and Q32, generates DB voltage from B voltage,
and stabilizes transmission output.
The APC circuit is configured to protect over current of
the power module due to fluctuations of...

28
TK-860G/862G

Encode
The QT and DQT signals are output from TO of the CPU
(IC502) and summed with the external pin DI line by the
summing amplifier (IC2) and the resulting signal goes to the
D/A converter (IC6) of the TX-RX unit.  The DTMF and 2-
TONE signals are output from DTMF of the CPU and goes to
the audio processor (IC508).  The signal is summed with a
MIC signal by the audio processor (IC508), and the resulting
signal passes through an analog switch (IC509) and goes to
the TX-RX unit (MO).
The...

29
TK-860G/862G
SEMICONDUCTOR DATA

Terminal function
Pin No. Name I/O Function
1 EMGT OExternal MIC control. Mobile MIC : H
2 DTMF O DTMF/2TONE/BEEP output.
3 2TN I 2TONE decode pulse input.
4 DTMSTD I DTMF decode detect. Detect : H
5 SIM I Destination select.
6 BYTE I +5V (5C).
7 CNVSS I GND.
8 AFSTB O Base band IC strobe/reset output.
9 AFFCLK O Base band IC frame detect reset/
system reset output.
10 RESET I Reset.
11 XOUT O Clock output.
12 VSS – GND.
13 XIN I Clock input.
14 VCC – +5V.
15 NC I Pull...

30
TK-860G/862G
SEMICONDUCTOR DATA
Shift Register : BU4094BCFV

Terminal function (TX-RX unit IC510)
Pin No.Port Name Function
4 Q1 W/N Wide/Narrow SW. Narrow : H
5 Q2 MUTEMIC mute (M models only). Mute : H
6 Q3 MBL MIC/LCD backlight control.
Backlight on : H
7 Q4 LED0 Red LED. LED lights : H
11 Q8 BSHIFT Beat shift. Shift on : H
12 Q7 AFREG2 Base band IC inter register select 2.
13 Q6 AFREG1 Base band IC inter register select 1.
14 Q5 LED1 Green LED. LED lights : H

Terminal function (TX-RX unit IC9)...