JC-3 manual version 8.1 page 3
TRANSCEIVER – COUPLER COMMUNICATION CABLE
DISTANCE
2-20 m.
DIAMETER
0.50 mm
20-35 m.
0.75 mm
35-50 m.
1.00 mm
DIRECT CONNECTION BETWEEN COUPLER AND TRANSCEIVER
YAESU
ALINCO
ICOM
KENWOOD
YAESU DOES NOT HAVE
START - KEY LOGIC.
OPERATION
IS
ONLY
POSSIBLE
USING
THE
CONTROL BOX !!!
ΟΟΟΟΟ
Ο Ο Ο Ο
Ο
Ο
KEY
Ο
GND
G
N
D
+12V
K
EY
S
R
T
K
EY
S
R
T
+12V
G
N
D
Ο
SRT
Ο
+12V
*We connect +12V , START and KEY terminals with the proper connector behind the transceiver.
(-12 V does not need to be connected to the coupler since it returns to the power supply via coaxial shield.)
Transceiver’s MENU must be programmed for external coupler operation, if needed.
ATTENTION: If you use the control box with a separately power supply than the power supply of your radio then
you
MUST
connect the “-“ of the 12v tuner power supply to the GROUND connection of the radio. You can do this
with a separate single earth wire.
Always avoid ½ wave length wires. Better is to make it just a little longer. So better 12 meter than 10 meter long
wire.
USE RUBBER TAPE TO ISOLATE YOUR CONNECTORS FROM WATER AND RAIN
(Like vulcanized Telco tape and so on)
The earth connection and wires are very important. Just some radials on the ground is not good enough! The
counterpoise must be as close to the tuner outside as possible for the best performance.
Do not open the JC-3 tuner box for maintenance. It has no parts for service inside or any adjustment or
switches.
The box is sealed which you have to seal again if you open the tuner anyway.
We recommend to make precautions that full rain does not come direct on the tuner box