Kenwood TK-7150 Manual Do Utilizador

TK-7150

The DSP circuit filters transmit/receive audio signal and

encode/decode signalling (QT, DQT, MSK, DTMF, 2-Tone,
LTR ID).  This circuit consists of IC710, IC706, IC707, IC708,
IC709 and IC713.

The receive audio signal is converted from analog to digital

by IC713 with a sampling frequency of 19.2kHz.  The digitized
audio signal is sent to DSP (IC710) to process the signalling
signal and audio signal.  The processed digital audio signal is
fed to CODEC (IC713), converted from digital to analog, and
the analog signal is output from pin 16 (AOUTR).

The transmit audio signal coming from IC714 (A/2) is am-

plified by IC712 (B/2), fed to pin 3 (AINL) of CODEC (IC713),
and converted from analog to digital at a sampling frequency
of 19.2kHz.  The digitized transmit audio signal is AGC-pro-
cessed, pre-emphasized and filtered at 300Hz to 3kHz by
DSP (IC710), and the resulting signal is feed back to CODEC
(IC713), and converted from digital to analog, and the analog
signal is output from pin 15 (AOUTL).

IC706, IC707, IC708 and IC709 are interface IC between

the CPU operated at 5.0V and the DSP operated at 3.3V.

The voltage is always applied from +B.  D103 protects

IC102 (DFF) against overvoltage.

Pulses from power switch are input to the IC102 clock line

and the CPU (IC701).  These clock pulses reverse the output
High (radio : turn off) → Low (radio : turn on), do not reverse
the output Low → High.  The CPU (IC701) output the pulse to
IC102 set line to reverse the output Low → High.

IGN is input to the IC102 reset line and the CPU (IC701).

When the IC102 reset voltage rise, the output goes Low (ra-

D103

AVR

D106

SW

D102

SW

Q102

SW

Q101

SW

D104

SW

IC102

DFF

Q111

SW

Q112,113

SW

IC701

CPU

D105

SW

Q109,110

SW

D109

AVR

Q710

SW

Q108

SW

Q713

SW

R112

IGN

PSW

+B

Q103

SW

SB

dio : turn on).  When IGN falls, the CPU (IC701) output the
pulse to IC102 set line to reverse the output Low → High
after the programmed time expire (Timed power off func-
tion).

If 24V is supplied to the radio by mistake, Q102 turns on,

Q101 turns off, the power is forced to be turned off.

This circuit consists of IC104 (8V), IC105 (5V), IC106

(3.3V), IC108 (3.3V) and IC107 (1.8V).

The display unit consists of CPU (IC904), LCD assembly,

LED, and other components.

Channels are changed by the rotary switch (S1).  The up/

down signals from the rotary switch enter the CPU (IC904),
and converted to a serial data signal, and are sent to the CPU
(IC701) in the TX-RX unit.  The on/off signals of keys other
than the power switch, and the PTT and HOOK signals, are
converted to serial data and sent to the CPU (IC701) in the
TX-RX unit.

Data is displayed on the 12 digits and 3 digits dot matrix

alphanumeric display.

The RS-232C circuit connects the RS-232C serial port of a

personal computer directly to this model to perform FPU op-
eration (Read and Write).  The FPU operation can also be per-
formed by connecting a programming cable (KPG-46) to the
local microphone on the front panel.  The 232C driver IC
(IC703) changes the TTL-232C level.  The firmware can only
be rewritten with the local microphone on the front panel.

PF1

D910

PF2 PF3 PF4 PF5 PF6

POWER

SW

RST

PSW

SB

AVR

IC901

5V

RST

X901

12MHz

SW

SW

AF VR

D909

D908

SW

SW

D911

D913

D914

SW

Q904

Q908

Key back lamp

Q903

REF

D907

SB

IC904

CPU

LCD

PTT

HK

Q907

D915

RX LED

SW

Q906

D912

TX LED

Q902

BEAT SHIFT

IRS

ES2

DM

1

8

MIC

PTT

SB

HK

ME

E

8LC

MIC

INT SP

Rotary SW

J901