Adjustments - Kenwood TS-120S Service Manual

ADJUSTMENTS
GENERAL
Complete adjustment also requires a frequency counter,
SSG, sweep generator and so on.
(TX BPF, RX BPF, IF trap)
TEST EQUIPMENT REQUIRED
1. VTVM or DVM
1) In put resistance: More than 1 MQ
2) Voltage range: 1.5 to 1000V AC/DC
NOTE:
A high-precision voltmeter may be used. However, accurate
readings can not be obtained for high-in-impedance circuits.
2. RF VTIVM
1) Input impedance: 1 MQ and less than 3 pF, min.
2) Voltage range: 10 mV to 300 V
3) Frequency range: 50 MHz or greater
NOTE:
During adjustment special accuracy is not required (such as
input level or PLL circuit carrier oscillator output), a VTVM or
VOM may substitute for an RF TVTM by measuring through
the output of a detector as shown in item 12.
3. AF VTVM
1) Frequency range: 50 Hz to 10 kHz
2) Input resistance: 1 MQ or greater
3) Voltage range: 10 mV to 30 V
4. AF GENERATOR (AG)
1) Frequency range: 200 Hz to 5 kHz
2) Output: 2 mV~1 V, low distortion
5. AF DUMMY LOAD
1) Impedance: 8Q
2) Dissipation: 3 W or greater
6. RF DUMMY LOAD
1} Impedance: 50 to 752, 150
2) Dissipation: 1OOW continuous or greater
3) Frequency limits: 1.8 to 30 MHz
The above-mentioned instruments may be used for simplified
adjustment.
For complete precise adjustment, the following
instruments are also necessary.
7. OSCILLOSCOPE
Requires high sensitivity external synchronization capability.
8. SWEEP GENERATOR
1) Center frequency: 8.83 MHz
2} Frequency deviation: Maximum +5 kHz
3) Output voltage: More than 0.1V
4) Sweep rate: At least 0.5 sec/cm
9. Standard Signal Generator
1) Frequency range: 1.8 to 30 MHz
2) Output: —6 dB~120 dB (0.25 uwV~0.5V)
NOTE: ———_—______
Generator must be frequency stable.
10. FREQUENCY COUNTER
1) Minimum input voltage: 50 mV
2) Frequency range: Greater than 40 MHz
11. NOISE GENERATOR
Must generate
iginition-like
noise
containing harmonics
beyond 30 MHz.
12. DETECTOR
Output
(To oscilloscope)
400P
Input
(To RF unit)
GND GND
37