Stockcorner JC-4s, Руководство пользователя, Страница: 9 / 14

JC-4s manual version 9.1 page 9
The counterpoise system is the most importance in antennas shorter or equal to λ/4. The shorter from
λ/4 an antenna is, the more it depends on the counterpoise system. As a general rule we can assume
that the electrical length of the counterpoise must be greater than that of the antenna. It is preferable
to place a metal grid, or many wires just below the ground terminal of the coupler then a long piece of
wire that is connected to some metal tube, water pipe or the actual ground (the earth).
The counterpoise must be as close as possible to the coupler!
If, when we finish the procedure, our transmission is satisfactory and all goes well, we don’t have to
worry any more, but if we detect holes at some frequencies or low performance in our
communications or «rf feedback», we must proceed to improvements. The general rule is that the
counterpoise must be connected primarily to the coupler and not to the transceiver!
ATTENTION!
WHEN THE COUPLER IS OPERATED NEAR MAXIMUM POWER, WE MUST NEVER USE HIGHLY
COMPRESSED TRANSCEIVER AUDIO BECAUSE AVERAGE POWER TENDS TO APPROACH THE PEAK
ENVELOPE POWER AND THE INDUCTORS AND CAPACITORS IN THE COUPLER WILL BE OVERHEATED!
FOR ANTENNAS 1, 3 & 4 NO GUARANTEE IS GIVEN FOR THE MAXIMUM POWER OF 1KW SSB IF THE
USER IS NOT FAMILIARIZED ENOUGH WITH THE SUBJECT. THE TYPICAL FORM OF ANTENNA THAT THESE
COUPLERS OPERATE IS ANTENNA CASE 2.
WE MUST NEVER RETUNE THE COUPLER WITH A LINEAR AMPLIFIER TURNED ON TO OBTAIN LOWER
SWR!
WE MUST NEVER OPERATE THE COUPLER IN THE THROUGH POSITION (or generally untuned) AND
ELIMINATE THE SWR USING ANOTHER TUNER NEAR THE TRANSCEIVER OR THE LINEAR AMPLIFIER.
WHEN THE COUPLER IS USED WITH A VACUUM TUBE LINEAR AMPLIFIER, THE FINAL TUNING OF THE
AMP MUST BE DONE VERY QUICKLY AND BY AN EXPERIENCED PERSON. THE BEST SOLUTION IS TO
TUNE YOUR AMPLIFIER ON A DUMMY LOAD.
NEVER PLACE ANOTHER HF ANTENNA VERY NEAR THE ANTENNA USED BY THE COUPLER. THE COUPLER
WILL NEVER TUNE NEAR THE RESONANT FREQUENCY OF THAT ANTENNA.
NEVER CREATE A COMPLICATED GROUND SYSTEM CONNECTING ALL GROUNDS IN YOUR HOUSE
TOGETHER WITH A BUNCH OF WIRES IF YOU DON’T KNOW HOW TO DEAL WITH IT
USE RUBBER TAPE TO ISOLATE YOUR CONNECTORS FROM WATER AND RAIN (LIKE VULCANISED TELCO
TAPE AND SO ON) . THIS TAPE IS NOT PROVIDED WITH THE COUPLER
H: HOW TO CONNECT THE JC-4 DIRECT TO YOUR TRANSCEIVER
It is also possible to connect the JC-4 tuner direct to most Alinco, Icom and Kenwood transceivers.