Adjustment - Kenwood TM-281A Service Manual

TM-281A
Measuring Equipment for Alignment
1. Digital voltmeter (DVM)
Input impedance: High
2. RF voltmeter (RF VM)
Input impedance: 1MΩ or more, 2pF or less
Voltage range: Full scale=10mV to 300V
Measurable frequency range: Up to 200MHz
3. Frequency counter (f.counter)
Input sensitivity: About 50mV
Frequency range: 10Hz to 1000MHz
4. DC power supply
Voltage: Variable in the range 9 to 17V
Current: 14A or more
5. Power meter
Measurement power: 65W, 25W
Impedance: 50Ω
Measurable frequency: Up to 200MHz
6. AF voltmeter (AF VM)
Input impedance: 1MΩ or more
Voltage range: Full scale=1mV to 30V
Measurable frequency range: 50Hz to 10kHz
7. AF generator (AG)
Output frequency: 100Hz to 10kHz
Output voltage: 0.5mV to 1V
8. Linear detector
Measurable frequency: Up to 200MHz
9. Spectrum analyzer
Measuring range: 10kHz to 1GHz or more
10. Oscilloscope
High sensitivity with horizontal input terminal
11. Standard signal generator (SSG)
Frequency range: 136 to 174MHz
Output: –133dBm (0.05µV) to greater than –13dBm
(50mV)
12. Dummy load (for AF)
8Ω, about 5W
13. Sweep generator
The sweep generator must be able to sweep the fre-
quency range of 30 to 300MHz.
14. Tracking generator
Output voltage: 100mV or more
20

ADJUSTMENT

Preparation
• Set the controls and switches to the positions listed be-
low unless otherwise specifi ed.
Volume control : Fully counterclockwise
Power switch : OFF
(as viewed from the front of the transceiver)
• To protect the signal generator, never connect the micro-
phone to the microphone socket when the receiver sec-
tion is adjusted.
• Before the power cord is connected, make sure the pow-
er switch is off.
• Without specifi cation of SSG, standard modulation is ap-
plied (MOD: 1kHz, DEV: ±3kHz)
CM
HOOK
MIC
ME
PTT
GND
8C
MBL
Microphone socket