Kenwood TS-990SHF manual Transmit, Thermal simulation example

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HF/50MHz TRANSCEIVER TS-990S

Transmission unit /cooling

Transmitter performance, featuring high-scale specifications,

can withstand long periods of operation at full power.

Operating stably even when continually working over long periods of time, such as in competitions.

Built-in automatic antenna tuner capable of high-speed operation

The built-in automatic antenna tuner is a preset type that covers amateur band frequencies rang- ing from 160m~6m, and can be switched in on receive too. The tuner is capable of rapid QSY based on instantaneous band change, using a relay system that is known for high-speed operations. The relay, inductors, and coil use large-sized com- ponents that are able to bear the 200 W output.

Transmit

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.

 

ANT

 

 

RX OUT

 

RX IN

1

2

3

4

 

 

 

 

 

 

 

MAIN BAND

 

 

 

MAIN

 

 

 

ANT Selector

 

 

MAIN RX ANT

BAND

 

 

 

 

 

RX

OFF

RECEIVER

 

 

 

 

 

 

 

 

 

 

 

AT

 

ON

 

 

 

 

 

TX

SUB RX ANT

SUB

 

 

 

 

 

 

 

 

SUB BAND

 

 

OFF

BAND

 

 

 

 

 

 

RECEIVER

 

 

 

ANT Selector

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Transmission Unit

High reliability design promises stable operation at 200W

Cooling system to send a sufficient volume of air to each unit

The device uses POWER MOSFET VRF150MP, which runs at 50V, with push-pull. You can obtain a high, stable output of 200 W on all bands. You can achieve superior IMD properties by pursuing bias and matching conditions in order to fully exploit the

3rd order TX IMD 14.2MHz / 200W

 

-10

 

-30

 

-50

 

-70

 

-90

 

10 dB / div

SPAN 10 kHz

FET attributes. Further, you can realize Kenwood’s distinctive tone by amplifying the clean modulated signal produced by DSP with an amplifier that ex- hibits excellent linearity.

Cooling is very important to obtain a stable output of 200 W. Heat dissipation efficiency is increased in the TS-990S through a large fin-type aluminium heat sink. An independent variable-speed fan is provided for the switching power supply, final unit, and antenna tuner, cooling each unit with a sufficient air supply. The switching power supply and the final unit have twin cooling fans. Noise is reduced by controlling the fan speed according to the temperature.

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.

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Contents Hertfordshire WD18 9EB, United Kingdom TS-990S Page TS-990S Repeated innovation turns the tradition into a legend TS-990S NEW Newly developed mixer contributes to achieving +40 dBm IP3 Main ReceiverHF/50MHz Transceiver TS-990S Roofing filter, 500 Hz, 2.7 kHz Sub ReceiverTriple DSP Sub-receiver, which incorporates the TS-590S receiverExacting chassis design for realizing quality sound Advanced AGC control, fusing together digital and analogueThermal simulation example TransmitMain display example views Sub band display monitors the target signal itselfDual display Main displayNew frequency function can be operated intuitively New split function allows you to use quick settingsControl Kenwood SKY Command System Firmware updates by USB flash drive or USB cableData mode supported by external I/O switching Remote control TS-990S from your PCFront/Rear Panel DimensionsMain Options Specifications