4
*DIRECT COMMUNICATION WITH TRANSCEIVERS
YAESU
ALINCO
ICOM
KENWOOD
YAESU does not use the KEY-
START logic. They exchange data
with their transceivers using a
single wire. So the coupler can only
cooperate
with
YAESU
transceivers with the standard
control box.
ΟΟΟΟΟ
Ο Ο Ο Ο
Ο
Ο
KEY
Ο
GND
GND
+
12V
KEY
SRT
KEY
SRT
+
12V
GND
Ο
SRT
Ο
+12V
*
We c12V, START and KEY of the JC-5 with the appropriate connector. Τhe GND of the
transceiver’s connector does not need to be connected to the COUPLER. It gets there from the shield
of the coaxial line! The MENU of the transceiver must be programmed, if needed!
We recommend to connect the black cable to the +12v to switch the internal memories on.
If you connect the tuner direct to a radio like above you do not need the control box which is
provided. The control box is only needed if you do NOT connect a radio like above.
You can use ANY HF radio with the control box.
We recommend that you first get familiar with the external control box how the system works.
NOW, GENERALLY SPEAKING, IT IS A GOOD PRACTICE, IF A LINEAR AMPLIFIER IS USED, NOT TO
CONTROL THE COUPLER DIRECTLY FROM AN ICOM, KENWOOD OR ANY OTHER TRANSCEIVER
USING THE “KEY – START LOGIC”. BETTER USE THE MANUAL CONTROL BOX, SO THAT NOTHING
STRANGE WILL HAPPEN DUE TO STRONG RF FIELDS, IN CASE TRANSMITTING ANTENNA IS VERY
NEAR THE SHACK !
If you place the tuner outside please pay good attention to the connectors.
All connectors have to be protected with rubber tape to avoid water inside the connectors.
(Coax connector and 4 pin control connector)
TRANSCEIVER - COUPLER CONTROL CABLE:
4 x 0,75 mm or better.
(Brown, Grey,
Yellow and Black are the preferred colors but it makes no difference ofcours)
If you use a short control wire (< 25 meter) a normal UTP cable will do the job.
(But use all 8 wires)
But it is common sense that UTP cable is not produced for 12 Volt DC voltage power use.
UTP is used only for low current signals like a network.
IT IS ALSO VERY IMPORTANT TO ROOT THE CABLES FEEDING AND CONTROLLING THE COUPLER AS
FAR AWAY AS POSSIBLE FROM THE ANTENNA FIELD, TO AVOID INTERFERENCE, ESPECIALLY IN THE
KEY-START COMMANDS OF THE COUPLER. IT WOULDN’T BE BAD TO USE SHIELDED 4 WIRE CABLE
FOR THE CONTROL AND EXPERIMENT FOR THE BEST POINT TO CONNECT THE SHIELD OF THE
CABLE FOR BEST RESULTS ! (NEEDS SOME EXPERIENCE, OF COURSE)
(THERE ARE CASES THE COUPLER MAY GO THROUGH OR GET A “START TUNING” COMMAND
UNEXPECTEDLY, WHILE TRANSMITTING WITH THE AMPLIFIER ACTIVATED, BECAUSE OF RF
FEEDBACK !!!)
NEVER ATTEMPT TO
CORRECT THE SWR USING AN INDOOR TUNER, ESPECIALLY IF THE
EXTERNAL COUPLER UNEXPECTEDLY AND CONTINUOUSLY REFUSES TO KEEP THE SWR
AT THE LEVEL YOU KNOW IT CAN ACCOMPLISH. TAKE IT DOWN IMMEDIATELY AND
CHECK IT, BECAUSE SOMETHING MAY BE BURNED INSIDE AND
THE MORE YOU INSIST
TRANSMITTING, THE MORE DAMAGE YOU MAY CAUSE !!!