MFJ-1779B ½ Wavelength Dipole Antenna
Instruction Manual
2
INVERTED ANTENNA
This installation only requires one tall and two short supports. The center
insulator of the antenna should be the highest point of the antenna.
SLOPED ANTENNA
This installation requires one tall and one short support.
TOOLS AND ACCESSORIES NEEDED FOR ASSEMBLY
•
SWR Analyzer (MFJ-259) OR SWR Meter And HF Radio
•
Weather Resistant Non-Metallic Nylon Rope
•
Wire Cutters (large enough to cut #14 wire)
•
Coax
FREQUENCY ADJUSTMENT
The MFJ-1779B dipole antenna can be tuned for use on any amateur band from
3.5 to 7.3 MHz. Refer to the tuning chart below for approximate lengths.
ALWAYS HANG THE ANTENNA IN THE DESIRED OPERATING
LOCATION FOR TUNING. CHECK THE RESONANCE POINT OF THE
ANTENNA BEFORE ANY WIRE IS REMOVED.
1. Remove the antenna and parts from the packaging.
2. Decide on the center frequency of operation. The table below has
approximate lengths for each band. Column A gives the approximate lengths
of the entire antenna. Column B gives the length of each side of the dipole.
The lengths can also be determined by using the following formula. This
formula will give the length of the
½ wavelength
dipole. This must be
divided by two in order to get the length of each side of the dipole.
468/frequency (MHz)=1/2 wavelength
3. Attach a coax to the antenna and place it in the desired location. Be sure to
leave enough rope so the antenna can be lowered for adjustment. Raise the
antenna into is normal operating position using a strong nylon rope. Check
Band A
B
80
134 ft
67 ft
40
67 ft
34 ft
30
47 ft
24 ft
