Special Components Data - Kenwood TS-130S Service Manual

TS-1308V
CIRCUIT DESCRIPTION /SPECIAL COMPONENTS DATA
The 10MHz signal from the time-base reference oscillator is divided
to produce gate, latch, and reset pulses which are fed to the counter.
The 10 MHz and 500kKHz signals are fed to the PLL circuit.
The marker circuit produces a 100kHz signal which synchronizes
the 25kHz multivibrator to obtain a marker signal as accurate as the
reference frequency. The analog dial can be accurately calibrated to
the marker signal.
The 1/10 division at the first-stage count-down chain uses low-
power Schottky TTL, while the remaining divisions are made by a
CMOS IC for low power consumption and minimum spurious e-
mission.
Because of the IF SHIFT circuit, the CAR frequency is independent
of the transmit/receive frequency. Once the VFO frequency is
counted, the operating frequency is indicated as accurately as the
10 MHz reference oscillator frequency is calibrated to WWV.
Operating frequency is indicated accurate to the 100Hz order, re-
gardless of the band or mode.
PROTECTION CIRCUIT
When the transmit output load varies, the toroid in the final circuit
samples reflected power. It is then rectified and amplified,
producing a protection voltage to control the 2SK19 (Q12) on the
AF-GEN unit, so transmitter output is continuously reduced.
FILTER UNIT
1. ALC: Protection circuit (VSWR)
The protection voltage picked up by L18 (Stype), L11(V type) in
the filter unit is amplified by Q1(S type),Q2 (V type) (2SC1815),
then applied to the ALC line to control the output voltage.
2. Fan drive circuit (S type)
The output of the thermistor TH3 detecting the temperature of the
final unit is applied to Q6 (2SA562) via Q7 and Q8, so that Q6 is
switched to operate the fan. The fan starts to rotate at about 45°C
although the operating range shown in specification is 30~60°C,.
It stops when the temperature drops to a level 5~15°C lower than
the start temperature. This circuit operates regardless of transmis-
sion or reception because it detects the temperature of the heat
sink.
3. AVReircuit
The 11V AVR consists of 04, Q5 and O6 (V type), Q4, Q5 and
Qi0 (S type) . The regulated voltage is supplied to every unit
except for the fan drive circuit during transmission. The fan drive
circuit is always supplied with the regulated voltage regardless of
transmission or reception.
4. Filter circuit
The filter is a 2-stage constant K filter (3-stage for 3.5 MHz band).
When the processor switch is ON Q1 (V type) or Q11 (S type) is
cut off to shorten the ALC time constant.
FINAL UNIT
1. Temperature protection (S type)
1. Core temperature protection
operates when the output transformer temperature ex-
ceeds 120°C. It recovers at approx. 80 to 110°C.
2. Operates when the heat sink temperature exceeds
90°C. It recovers at approx. 50 to 80°C.
When either of the above protection systems operate,
the RL circuit in the AF-GEN unit is turned OFF and the
unit is forcibly placed in the reception mode and trans-
mission is inhibited. The protection circuit automatically re-
covers when the temperature drops to the normal level
(i.e., the temperature drops by about 40°C).
2. Temperature detection by the fan drive circuit (S type)
The heat sink temperature is detected by the thermistor TH3 to
control fan operation.
SPECIAL COMPONENTS DATA
@ Applications
2SC2290(V03-2290-06) HF power amplifier for S type.
NPN Epitaxial planar Si transistor
@ Absolute maximum ratings
Item | Pc Vcpo Vces VeBO IC 1E Tstg
Value| 175(W) 45(V) 45(V) 4.0(V) 20(A) —20(A) —65~175(°C)
(Tc=25°C)
® Application
2SC2509 (VO3-2509-06) HF power amplifier for S,V_ type.
NPN Epitaxial planar Si transistor
@ Absolute maximum ratings
Item | Pc Vcspo Vces Vceo Veso IC IE Tstg
Value} 20(W) 40(V) 40(v) 18(v) 4(v) 5(A) —S(A) -55~150(°C)
(Tc=25°C) |
® Application
2SC2075(VO03-2075-06) HF power amplifier for V type.
NPN Epitaxial planar Si transistor
@ Absolute maximum ratings
Item | Pc Vepo Vces Veso IC IE Tstg .
Value| 10(W) 80(V) 80(V) 4.0(V) 4(A) —4(A) —55~150(°C)
(Tc=25°C)