Kenwood TS-120S Service Manual

ADJUSTMENTS
GENERAL
Adjustment
procedures
for
this
transceiver
are
classified
into
formal
adjustments
requiring
service
benche
and
simplified
adjustment
using
a
VTVM,
AF
and
RF
VTVM
AG, and
AF
and
RF
dummy
!oad.
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.
a
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

Kenwood TS-120S Specifications

General

Brand	Kenwood
Model	TS-120S
Category	Transceiver
Language	English