Kenwood TK-3148 Service Manual page 40

Uhf fm transceiver
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TK-3148
Note
You must adjust the frequencies in all channels as shown
above, even though the channel frequencies in the 3 row are
below the specifications of the TK-3148.
Signalling
Signalling No.
RX
1
None
2
None
3
QT 67.0Hz
4
QT 151.4Hz
5
QT 210.7Hz
6
QT 250.3Hz
7
DQT 023N
8
DQT 754I
9
None
10
None
11
None
12
None
13
None
14
FFSK(CODE)
• Preparations for tuning the transceiver
Before attempting to tune the transceiver, connect the unit
to a suitable power supply.
Whenever the transmitter is turned, the unit must be
connected to a suitable dummy load (i.e. power meter).
The speaker output connector must be terminated with a
16Ω dummy load and connected to an AC voltmeter and an
audio distortion meter or a SINAD measurement meter at all
times during tuning.
• Transceiver tuning
(To place transceiver in tuning mode)
Channel appears on LCD. Set channel according to tuning
requirements.
LCD display (Test mode)
1
channel No.
Signalling No.
Press [S], now in tuning mode. Use [2 B] button to write
tuning data through tuning modes, and channel selector knob
to adjust tuning requirements (1 to 256 appears on LCD).
Use [C 3] button to select the adjustment item through
tuning modes. Use [A] button to adjust 3 or 5 point tuning.
And use [Side 2] button to switch between Wide/Narrow.
40
ADJUSTMENT /
TX
None
100Hz Square wave
QT 67.0Hz
QT 151.4Hz
QT 210.7Hz
QT 250.3Hz
DQT 023N
DQT 754I
DTMF tone 9
Single Tone 1200Hz
(HSD OUT)
Single Tone 1200Hz
(MODEM OUT)
Single Tone 1800Hz
(MODEM OUT)
FFSK(PN pattern)
FFSK(CODE)
1
调整
注释
用户必须调整上述所有信道中的频率,即使第 3 行的信道频
率低于 TK-3148 的规格。
信令
信令号码
RX
1
2
3
QT67.0Hz
4
QT151.4Hz
5
QT210.7Hz
6
QT250.3Hz
7
DQT023N
8
DQT754I
9
10
11
12
13
14
FFSK(代码)
调整手持机的准备
在进行调整手持机之前,将主机与电源连接。
无论何时调整发射部分,主机必须连接到合适的假负载(或
功率仪) 。
在整个调整过程中, 扬声器输出必须经过16Ω假负载并被连
接到一个交流电压表和一个音频失真测试仪或一个SINAD测量
仪。
手持机调整
(将手持机置于调整模式)
信道显示在 LCD 上。按照调整所需设定信道。
LCD 显示(测试模式)
1
1
信道号码
信令号码
按[S]键进入调谐模式。 使用[ B]键通过调谐模式写入调谐数
据,信道选择器按钮调整调谐要求(1 到 256 出现在显示器上) 。
C
使用[
]键通过调谐模式选择调整的项目。 使用[A]键调整3
或 5 点调谐。并使用 [侧面 2] 按钮在宽/窄之间切换。
TX
100Hz 方形波
QT67.0Hz
QT151.4Hz
QT210.7Hz
QT250.3Hz
DQT023N
DQT754I
DTMF 音频 9
单音 1200Hz
(HSD 输出)
单音 1200Hz
(调制解调器输出)
单音 1800Hz
(调制解调器输出)
FFSK(PN 形式)
FFSK(代码)

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