UNIVERSAL H-F ANTENNA COVERS 3.5 TO 29.7 MHZ. THIS CENTER FED ANTENNA UTILIZES A ANTENNA TUNER.
____________________________________ ________________________________ 66FEET / / 66FEET / / / / FEED LINE 300/450 OHM OPEN WIRE.
IT'S EASY TO UNDERSTAND WHY HAM HAVE HAD LOVE AFFAIR WITH WIRE ANTENNA. THEY ARE INEXPENIVE AND EASY TO INSTALL. ONE OF THE SIMPLEST WIRE ANTENNA DESIGNS IS ALSO ONE OF THE OLDEST, THE RANDOM LENGHT DIPOLE FED WITH AN OPEN WIRE FEED LINE. YOU CAN PUT THIS ANTENNA UP ALMOST ANYWHERE IN ALMOST ANY CONFIGURATION AND GET ON THE AIR BAND RIGHT AWAY. THE ONLY TRICK IS MATCHHING THE ANTENNA TO INPUT IMPEDANCE OF THE ANTENNA SYSTEM TO THE OUTPUT OF YOUR TRANSCEIVER (50 OHM)
DON'T WORRY TO MUCH ABOUT THE TOTAL LENGH OF THE ANTENNA THE FORMULA 468/ FREQUENCY IN MHZ. IF YOU MAKE IT ABOUT 132 FEET YOU HAVE PICK 3.5 MHZ OR 80 METER AS YOUR LOWER FREQUENCY BAND. CONNECT THE LADDER OR OPEN WIRE FED TO THE CENTER INSULATOR. FEED THE LADDER LINE INTO YOUR HOUSE TAKEING CARE TO KEEP IT FROM COMING IN CONTACT WITH MATAL.
THE NEXT THING IS TO CONNECT THE FEED LINE TO THE TRANSCEIVER. TO DO THIS YOU NEED A MATCHING DEVICE KNOWN AS A ANTENNA TUNER. NOT JUST ANY TUNER WILL DO. LOOK FOR A "BALANCED" TUNER OR A TUNER WITH A BALUM IN IT ( A BALANCE TO UNBALANCED TRANSFORMER) BUILT IN, THE LADDER LINE CONNECTS TO THE TWO TERMINALS ON THE BACK OF THE TUNER. AND A SHORT LENGHT OF COAXIAL CABLE CONNECTS THE TURNER TO YOUR RADIO.
WIRE ANTENNA FED WITH COAX CABLE MUST BE CAREFULLY TRIMMED TO LOWEST SWR ON EACH BAND. WITH A LADDER LINE DIPOLE NO PRUNING IS NECESSARY. SIMPLY THROW IT UP IN THE AIR AND LET THE TUNER WORRY ABOUT PROVING A LOW SWR FOR THE TRANSCEIVER.