TK-3178
(
L
)
17
5-1. Frequency Shift Circuit
The microprocessor (IC7) operates at a clock of 11.0592
MHz. This oscillator has a circuit that shifts the frequency by
Beat shift switch (Q17,Q18).
A beat sound may be able to be evaded from generation
if “Beat Shift” is set to ON when it is generated in the inter-
nal spurious transmission modulated sound of a transceiver.
5-1. 频率偏移电路
微处理器 (IC7) 在 11.0592MHz 时钟下工作。此振荡器有可
以被拍频偏移开关 (Q17,Q18) 变换频率的电路。
如果“拍频偏移”被设定为 ON，可以避免产生拍频声音。
Q17
Q18
C63
C64
C60
C62
X1
XOUT
SHIFT
XIN
IC7
MCU
“H” : OFF
“L” : ON
5-2. Memory Circuit
Memory circuit consists of the MCU (IC7) and a flash
memory (IC8). A fl ash memory has a capacity of 16M bits
and contains the transceiver control program for the MCU. It
also stores the data for transceiver channels and operating
parameter that are written by the FPU. This program can be
easily written from an external devices.
The EEPROM (IC9) stores the last channel data, the scan
on status, and other parameters.
■
Flash memory
Note:
The fl ash memory stores the data that is written by
the FPU (KPG-127D), and firmware program (User mode,
Test mode, Tuning mode, etc.). This data must be rewritten
when replacing the fl ash memory.
■
EEPROM
Note:
The EEPROM stores tuning data (Deviation, Squelch,
etc.).
Realign the transceiver after replacing the EEPROM.
5-3. Low Battery Warning
The battery voltage is monitored by the microprocessor
(IC7 pin 138: BATTLVL). When the battery voltage falls be-
low the voltage set by the Low Battery Warning adjustment
during the transmission, the red LED blinks to notify the
operator that it is time to replace the battery (When the “On
TX” option (default setting) under the Battery Warning / sta-
tus function in the FPU is selected.). If the battery voltage
falls below 5.9V, the transceiver does not transmit and the
warning tone beeps while the PTT switch is pressed.
5-2. 存储电路
存储电路由 M C U ( I C7) 和闪存 ( I C8) 组成。闪存的容量为
16M 位，并包括 MCU 的手持对讲机控制程序。它也保存手持对
讲机信道的数据和由 F P U 写入的操作参数。此程序很容易从
外部设备写入。
EEPROM(IC9) 保存最后的信道数据、扫描状态和其他参数。
■闪存
注意 :
闪存保存由 FPU(KPG-127D) 写入的数据和固件程序 ( 用
户模式、测试模式、调谐模式等 )。更换闪存后，此数据必须
重写。
■ EEPROM
注意 :
EEPROM 保存调谐数据 ( 频偏、静噪等 )。
更换 EEPROM 后，请重新校正手持对讲机。
5-3. 低电池电量警告
电池电压由微处理器 (IC7 针脚 138:BATTLVL) 监控。发射
期间，当电池电压低于低电池电量警告调节设置的电压时，
红色 L E D 闪烁，通知操作者应该更换电池了 ( 当选择了 F P U
电池告警 / 状态功能下的
“On TX( 发射时 )”
选项 ( 默认 ) 时 )。
如果电池电压低于 5.9V，按下 P T T 开关时手持对讲机不发射
并响起警告音。
MCU
EEPROM
FLASH
IC7
IC8
IC9
Fig. 8 Frequency shift circuit /
图 8 频率偏移电路
Fig. 9 Memory circuit /
图 9 存储电路
CIRCUIT DESCRIPTION /
电路说明
