Kenwood TH-235A Service Manual page 28

TH-235A/E/234
28
ADJUSTMENT
Required Test Equipment
1. Stabilized Power Supply
1)The Supply voltage can be changed between 5V and
18V, and the current is 3A or more.
2)The standard voltage is
13.8V (DC IN) 12.0V (BATTERY TERMINAL).
DC Ammeter (DC.A)
1)Class 1 ammeter (17 renges and other features).
2)The full scale can be set to either 300mA or 3A.
3)A cable of less internal loss most be used.
Frequency Counter (f.counter)
1)Frequencies of up to 500MHz or so can be measured.
2)The sensitivity can be changed to 250MHz or below,
and measurements are highly stable and accurate
(0.2ppm of so).
Power Meter
1)Measurable frequency : Up to SOOMHz.
2)lmpedance : 50Q, unbalanced.
3)Measuring range : Full scale of 10W or so.
4)A standard cable (5D2W 1m) must be used.
RF VTVM (RF V.M)
1)Measurable frequency : Up to 500MHz or so.
Linear Detector
1)Measurable frequency : Up to 500MHz.
2)Characteristics are flat, and CN is 60dB or more.
10.
11.
Digital Voltmeter (DVM)
1)Voltage range : FS = 18V or so.
2)Input resistance : 1MQ or more.
Oscilloscope
1)Measuring range : DC to 30MHz.
2)Provides highly accurate measurements for 5 to 25MHz.
AF Voltmeter (AF V.M)
1)Measurable frequency : 50Hz to 1MHz.
2)Maximum sensitivity : 1mV or more.
Spectrum Analyzer
1)Measuring range : DC to 1GHz or more.
Standard Signal Generator (SSG)
1)Maximum frequency : 500MHz or more.
2)Output : 0.05V/-133dBm to 0.1V/-7dBm.
3)Output impedance : 5002 -
12. Tracking Generator (TG)
13.
14,
1)Center frequency : 50kHz to 500MHz.
2)Frequency deviation : + 35MHz.
3)Output voltage : 100mV or more.
Dummy Load
1)8Q, 3W or more.
Distortion Meter
1)Measurable frequency : 30Hz to 100kHz.
2)Input level : 50mV to 10Vrms.
* If modulation is not specified for SSG, standard modulation is MOD. 1KHz, DEV. 3KHz, AF : 0.63V/8Q.
Service jig for adjustment
Connector Cable
(W05-0626-00)
How to use the jug