Kenwood TS-850S User Manual download pdf (Page 8)

(1) Antenna (4) Key connection

Caution

Protect your equipment — Use a LIGHTNING

ARRESTER.

The type of antenna that is used will greatly affect

the performance of the transceiver. Use a properly

adjusted antenna, of good quality, to enable your

transceiver to perform at its best. The antenna input

impedance is 50 ohms. Use 50-ohm coaxial cable

such as 5D-2V or RG-213/U (RG-8A/U) for this

connection. If the antenna is far from the transceiver

the use of low loss coaxial cable, such as 5D-2V or

RG-213/U (RG-8A/U) are recommended. Match the

impedance of the coaxial cable and that of the

antenna so that the SWR is less than 1.5 to 1. The

protection circuit in the transceiver will activate if the

SWR is particularly poor (greater than 3 to 1). High

SWR value will cause transmitter output to drop, and

may lead to TVI or BCI reports.

(2) Grounding

Caution

Never use a gas pipe or electrical conduit pipe.

Notes

1. A ground connection that is a 1/4 wavelength or

its multiple may provide a good DC ground, but

it will not provide a good RF ground.

2. A city water pipe cannot be used as a good

earth in some cases.

Your key should be connected as illustrated in the

figure below. When using an electronic keyer, make

sure that polarity is set for positive. Always use

shielded line from the key to transceiver, (diameter

6.0 mm)

|To use external straight key

Ground Not used +

+5V, Contact

Current about 1

-I-5V, Contact

Current about 1

Ground +

Note

Check the polarity of the plug when you use an

electronic keyer.

Please refer to Section 4-4.

Making a good earth connection is important for

preventing dangers such as electric shock and for

emitting a high quality signal with minimum spurious

radiation. Bury a commercially available ground rod

or copper plate under the ground and connect it to

the GND terminal. A thick wire, cut as short as

possible, should be used for the connection. To

make a good earth connection, connect the GND

terminal to a grounded metal water pipe.

(3) External speaker

The TS-850S includes a built-in speaker. If you

would like to use an external speaker, such as the

SP-31, it may be connected to the EXT SP jack on

the rear of the transceiver. The speaker may be any

good 8 ohm permanent magnet type speaker. The

diameter should be at least 4 inches for good audio

quality. If you plan on using a speaker other than the

SP-31 it should be equipped with a miniature phone

jack plug, (diameter 3.5 mm)

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Kenwood TS-850S User Manual Page 8

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