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The built-in automatic antenna tuner is a preset
type that covers amateur band frequencies rang-
ing from 160m~6m, and is completely operable
during receive. The tuner is capable of rapid
QSY based on instantaneous band change, using
a relay system known for high-speed operations.
The relays, capacitors, and inductors use large-
sized components that are able to bear the 200 W
output.
Cooling is very important to obtain a stable output
of 200 W. Heat dissipation efciency is increased
in the TS-990S through a large n-type aluminum
heat sink. An independent variable-speed fan is
provided for the switching power supply, final
unit, and antenna tuner, cooling each unit with a
sufcient air supply. The switching power supply
and the nal unit have twin cooling fans. Noise is
reduced by controlling the fan speed according to
the temperature.
to fully exploit the FET attributes. Further, you can
realize Kenwood’s distinctive tone by amplifying
the clean modulated signal produced by DSP with
an amplier that exhibits excellent linearity.
Thermal Simulation Example
To dissipate the heat of the 200 W final, we
used swage fins instead of the conventional
extruded aluminum fins. Using CAE
analysis, we designed the optimal fin shape
and size for heat dissipation.
Transmit
Operating stably even when continually working over long periods of time,
such as in competitions.
Transmitter performance,
featuring high-scale specifications,
can withstand long periods of operation at full power.
ANT
1 2 3 4
MAIN RX ANT
OFF
MAIN
BAND
RECEIVER
SUB
BAND
RECEIVER
OFF
ON
ON
AT
RX
TX
MAIN BAND
ANT Selector
SUB BAND
ANT Selector
Transmission Unit
RX OUT RX IN
SUB RX ANT
3rd order TX IMD 14.2 MHz / 200 W
SPAN 10 kHz10 dB / div
-10
-50
-70
-90
-30
The POWER MOS FET VRF150MP runs at 50 V in
push-pull. You can obtain a stable output of 200 W
on all bands. You achieve superior IMD properties
by pursuing bias and matching conditions in order
High reliability design promises stable operation at 200
W
Built-in automatic antenna tuner capable of high-speed operation
Cooling system to send a sufficient volume of air to each unit
It is outfitted with four antenna terminals, which can be set independently
on amateur bands, whether main band or sub band. The reception input
and output terminals can be used for reception dedicated antennas,
antenna output for external reception devices, and external BPF
connections. It is usable with either the main band or the sub band.
10
HF/50MHz TRANSCEIVER TS-990S
Transmission unit /cooling