Kenwood TS-680S Instruction Manual page 7

(1) Antenna
Caution:
Protect your equipment—Use a LIGHTNING AR-
RESTER.
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-2¥V for this connection. If the antenna is
far from the transceiver the use of low loss coaxial
cable, such as 5D-2V is recommended. Match the
impedance of the coaxial cable and that of the anten-
na so that the SWR is less than 1.5 to t. The protec-
tion 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 goad DC ground, but it
will nat provide a good AF ground.
2. A city water pipe cannot be used as a goad earth
in some cases.
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 possi-
ble, 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-140S/680S includes a built-in speaker. If
you would like to use an external speaker, such as
the SP-430, it may be connected to the EXT SP jack
on the rear of the radio. The speaker may be any
good 8 chm 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-430 it should be equipped with a miniature
phone jack plug.
The internal speaker is disabled when the external
speaker plug is inserted into the receptacle.
(4) Key connection
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.
Before connecting, check that the
polarity is correct. The KEY jack pro-
vides +5.5 V. Use shielded cable.
Key connection
x 5 a
é ¢ g
a a g
B. Front Panel
O) Headphones e
a
Microphones
(1) Headphones
Any low-impedance (4~ 16 ohms) headphones may
be used with the transceiver. Connect the head-
phones to the front panel phone jack.
The optional HS-5 or HS-6 headphones are best
suited for use with the transceiver. Stereo type
headphones can also be used.
(2) Microphones
Any microphone with an impedance between 500
and 50 kf may be used with this transceiver.
The KENWOOD microphones MC-43S (handheld),
MC-60A, MC-80, MC-85 (table-top type) are
recommended.
You can switch send/receive by voice if a voice con-
troller is connected. (TS-680S only)
(3) Voica Controller {TS-680S only)
We recommend the use of VOX-4.
Simply connect the MIC cable to the MIC jack.
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